Local-first developer tools
Tools that respect you
261 developer and power-user tools that run entirely in your browser. No ads, no accounts, no limits. Your files and inputs never leave your device.
Text 18
- Base ConverterConvert integers between binary, octal, decimal, hexadecimal, and base 36 with arbitrary precision and a bitwise visualizer.
- Case ConverterConvert text into camelCase, snake_case, kebab-case, Title Case, UPPERCASE, and URL safe slugs all at once.
- Character CounterGrapheme-accurate character, word, sentence, line, byte, and LLM token counts for any text.
- Escape / UnescapeEscape or unescape text in over thirty formats, from JSON, HTML, XML and URL to C, Python, shell, SQL, base64, ROT13, Morse and punycode.
- Figlet ASCII BannerRender text as an ASCII art banner in ten classic FIGlet fonts, with letter spacing and line width controls, ready to paste into a README.
- HTML to MarkdownTurn HTML and rich text pasted from Google Docs or Word into tidy Markdown.
- Invisible CharactersReveal zero-width characters, BOMs, non-breaking spaces, bidi controls, and stray line endings in pasted text.
- Language Code LookupLook up a language by ISO 639 code, English name, or native name, or a writing script by ISO 15924 code.
- Line ToolsSort lines alphabetically or naturally, remove duplicates, reverse the order, or shuffle any block of pasted text.
- Mojibake FixerRepair garbled text like é and ’ back to the UTF-8 it was meant to be.
- Unicode PickerSearch a curated set of Unicode symbols, arrows, math operators, Greek letters, and HTML entities, and copy any of them.
- Cipher ToolEncode and decode text with Caesar, ROT13, ROT47, Atbash, Vigenere, Affine, and Rail fence ciphers, plus a Caesar brute force scanner.
- Fancy Text GeneratorTurn plain text into bold, italic, script, fraktur, double-struck, circled, upside down, zalgo, and a dozen other Unicode text styles at once.
- Lorem Ipsum GeneratorGenerate placeholder paragraphs, sentences, or words in classic Latin or plain English filler, as plain text, HTML, or Markdown.
- Morse Code TranslatorTranslate text to and from Morse code automatically, with a timing table for any words-per-minute speed and support for common prosigns.
- NATO Phonetic AlphabetSpell out any text using the NATO phonetic alphabet, or three other military and telecom spelling alphabets, in either direction.
- Number to WordsSpell out a number in English words, including negative, decimal, ordinal, and currency forms, or convert words back into a number.
- Roman Numeral ConverterConvert between whole numbers and Roman numerals in either direction, with strict canonical validation and vinculum notation above 3999.
Data 17
- Chart MakerPaste CSV and get a clean SVG or PNG chart with no watermark and no sign up.
- CSV ViewerOpen, sort, filter and convert CSV and TSV right in your browser.
- Data Format ConverterConvert data between CSV, JSON, YAML, and TOML in any direction, auto detecting the source format from what you paste.
- Decode AnythingRecursively unwrap base64, hex, URL encoding, gzip, JSON, JWTs, timestamps and IDs until plain meaning falls out.
- Diff CheckerCompare two texts line by line, word by word, or as semantic JSON and YAML.
- Fake Data GeneratorBulk names, emails, addresses, IDs and JSON fixtures, with a seed for repeatable output.
- HAR ViewerWaterfall view, search and privacy-aware export for browser network captures.
- JSON / JWT / Base64Format, minify and validate JSON, decode a JWT into its header and claims, and convert base64 or URL percent-encoding, all in one box.
- JSON Schema ValidatorValidate a JSON document against a JSON Schema with readable, path-specific errors.
- JSON to TypesGenerate TypeScript interfaces, Zod schemas, or Kotlin data classes from sample JSON.
- Markdown Table EditorPaste a table from Excel, a CSV, or HTML and get a tidy, aligned Markdown table back.
- Parquet ViewerOpen a Parquet file and read its schema, row counts and data in your browser.
- Binary Format DecoderDecode protobuf, CBOR, and msgpack payloads to readable JSON in your browser.
- Snowflake DecoderPull timestamps and worker IDs out of snowflake IDs, Discord links, or a whole batch of them at once.
- SQL FormatterPrettify and normalize SQL across dialects with configurable keyword case and indentation.
- SQLite BrowserDrop a .db file and browse tables or run SQL, all in your browser.
- XLSX ViewerOpen, sort and filter Excel spreadsheets without uploading them anywhere.
Dev 14
- Unit CalculatorA calculator that understands units and currencies, so 3 ft + 4 in to cm just works.
- GPU InspectorInspect your browser's WebGPU adapter, its supported features, and its limits.
- MCP InspectorBrowse an MCP server's tools and schemas, read its responses, and build test calls.
- Speculation Rules BuilderBuild and validate prerender and prefetch rule sets for the Speculation Rules API.
- URLPattern TesterTest route patterns against URLs and inspect every matched group.
- UUID GeneratorGenerate RFC 9562 UUIDs on your own device: v4 random or v7 time-ordered, one at a time or a thousand at once, upper or lower case.
- WebAssembly Feature CheckTest which post-MVP WebAssembly proposals, like SIMD, threads, and garbage collection, your current browser actually supports.
- WASM InspectorRead a WebAssembly module's sections, imports, exports, and post-MVP features in your browser.
- Glob Pattern TesterCheck file paths against a glob pattern and see which ones match.
- JSONPath QueryRun a JSONPath expression against pasted JSON and see every match and its path.
- Regex TesterTest a regular expression with live match highlighting, capture groups, a replace preview, and a plain English explanation of the pattern.
- Semver Range TesterCheck whether a version satisfies a semver range, with plain English rules.
- Unified Diff and Patch ApplierApply a unified diff patch to pasted text and preview the result before download.
- XPath and CSS Selector TesterTest XPath expressions and CSS selectors against pasted HTML and see every match with its path and text.
CSS 7
- CSS Anchor Positioning BuilderBuild CSS anchor-positioned tooltips, menus, and popovers with flip fallbacks and a plain-CSS fallback.
- Box Shadow GeneratorStack multiple CSS box-shadow layers visually, preview them on light and dark, and copy the CSS or the Tailwind value.
- Clip Path GeneratorDrag shape handles over your own image and copy the matching CSS clip-path or SVG path.
- CSS Gradient GeneratorBuild linear, radial, and conic CSS gradients visually, pick the interpolation color space, and copy the CSS.
- CSS Keyframes BuilderBuild @keyframes animations on a visual timeline, preview them live, and copy the CSS with a reduced motion guard.
- Cubic Bezier Easing EditorDrag the control points of a CSS easing curve, watch it animate, and copy the cubic-bezier or linear() value.
- Fluid Clamp CalculatorTurn a min and max size into a responsive CSS clamp() expression, with a preview at six viewport widths.
Color 4
- Color Blindness SimulatorPreview any color palette or image under seven types of color vision deficiency, from protanopia to achromatopsia.
- Color SuiteConvert any CSS color between hex, rgb, hsl, hwb, oklch, oklab, lab and lch, check WCAG contrast, and build palettes in OKLCH.
- Color Contrast CheckerCheck a foreground and background pair against WCAG 2.x contrast ratios and the APCA Lc scale.
- Image Color Palette ExtractorPull the dominant colors out of an image as hex, rgb, hsl and oklch swatches with ready made CSS.
Security 15
- Bcrypt & Argon2 HasherHash and verify passwords with bcrypt, argon2, and scrypt, entirely in your browser.
- Certificate DecoderDecode PEM or DER X.509 certificates to read expiry, SANs, issuer, fingerprints, and chain order.
- Hash & ChecksumHash text or files with MD5, SHA-1, SHA-256, SHA-384, and SHA-512 at once, and verify the result against a known hash.
- Hash IdentifierWork out which algorithm likely produced an unknown hash, ranked by likelihood.
- JWT Vulnerability CheckDecode a JWT and test it for alg=none and weak HMAC signing secrets, entirely in your browser.
- OAuth Scope DecoderTurn an OAuth scope list into plain English access and an honest risk read.
- Passkey TesterRegister and authenticate passkeys, then decode the attestation object, flags, and public key.
- Password GeneratorGenerate random passwords or EFF diceware passphrases in your browser, each one reported with its exact entropy in bits and a crack-time estimate.
- TOTP GeneratorGenerate live two-factor authentication codes from a Base32 secret or an otpauth:// URI.
- HMAC GeneratorCompute and verify HMAC digests for a message and a secret key, in your browser.
- JWT GeneratorBuild, sign, and verify JSON Web Tokens with HS256, RS256, or ES256 locally.
- Password Strength CheckerScore a password's real entropy and crack time, with plain English reasons, on your device.
- Self-Signed Certificate GeneratorGenerate a self-signed X.509 certificate and private key for local development, in your browser.
- SSH Key GeneratorGenerate an Ed25519 or ECDSA SSH key pair in your browser, with fingerprint and PEM export.
- Text EncrypterEncrypt and decrypt text with a passphrase using AES-256-GCM, entirely on your device.
Network 11
- Browser Privacy CheckSee what your browser leaks: fingerprint surface, exposed APIs, and privacy signal irony, all analyzed on your device.
- DMARC Report ViewerDrop a DMARC aggregate report and see who is sending as your domain.
- DNS LookupQuery A, AAAA, MX, TXT, and other DNS records over DNS-over-HTTPS through Cloudflare, Google, or dns.sb, no server needed.
- DNS PropagationCompare live DNS answers from Cloudflare, Google, and dns.sb side by side.
- Email Header AnalyzerSPF, DKIM and DMARC verdicts plus a hop-by-hop delay waterfall from raw email headers.
- HTTP Header InspectorSee exactly which HTTP request headers your browser sends, with a plain English explanation for User-Agent, Sec-CH-UA, and more.
- Local File DropSend files straight from one browser to another over WebRTC, on the same Wi-Fi or across the internet, with no upload in between.
- Subnet CalculatorCIDR math, address ranges, splitting, and supernetting for IPv4 and IPv6.
- URL ParserBreak a URL into scheme, host, port, path, query parameters, and fragment, with percent-encoding decoded on every field.
- User-Agent ParserDecode a raw User-Agent string into browser name and version, rendering engine, operating system, and device type.
- WebRTC DebuggerParse ICE candidates from SDP or JSON, classify each address, and interpret STUN and TURN reachability results.
Time 10
- Countdown Timer and StopwatchRun a countdown to a date or duration, or a stopwatch with lap tracking, with the full state packed into a shareable URL.
- Cron ParserRead any cron expression in plain English, catch a mistake before it ships, and preview the next ten fire times in your scheduler's time zone.
- Discord TimestampsGenerate Discord's timestamp tags from a date or unix time, rendered in every reader's own local timezone automatically.
- Duration CalculatorAdd and subtract clock times, unit shorthand like 90m or 1.5h, and plain durations in a single expression or one per line.
- Epoch ConverterConvert unix timestamps to and from human-readable dates, in seconds or milliseconds, with ISO 8601 and relative time in any zone.
- ICS InspectorInspect a calendar (.ics) file and turn its events into Google Calendar and Outlook add links.
- Pomodoro TimerRun a Pomodoro work and break schedule as a live, always on top pop-out timer with configurable session counts.
- Temporal PlaygroundExplore date math, time zones, and DST edge cases with the Temporal API in your browser.
- Timezone PlannerFind the overlapping working hours across two to eight cities on any date.
- Week & Day NumbersLook up the ISO 8601 week number, day of year, quarter, and weekday for any date, including tricky year boundary cases.
Files 9
- Batch ProcessorRun a text transform over many files and write the results back, safely.
- Bulk RenameRename many files at once with regex or patterns, previewed before anything is written.
- Duplicate FinderFind identical files in a folder tree by content, then reclaim the space.
- File IdentifierWork out what a file actually is from its bytes, ignoring the extension.
- Folder DiffCompare two folders on your own machine and see exactly which files were added, removed, or changed by content hash.
- Compression LabRun text or files through gzip and deflate, compare sizes, and inspect compressed data.
- Hex ViewerInspect binary files byte by byte with reusable struct templates.
- Archive ViewerBrowse and extract zip and tar archives without unpacking them to disk.
- Torrent File InspectorDecode a .torrent file's trackers, file list and info hash.
Images 15
- EXIF Time ShifterFix a wrong camera clock by shifting the Exif timestamps in your photos.
- Favicon GeneratorBuild favicon.ico, a web manifest and the right link tags from one source image.
- Handwriting PadWrite or draw with pressure sensitive ink, then export it as SVG or PNG.
- Image DitheringConvert an image to a fixed palette with classic error diffusion or ordered dithering algorithms and a live preview.
- Redaction ToolBlack out parts of a screenshot by destroying the pixels, not hiding them.
- Image SteganographyHide a text message or a whole file inside an image's pixel bits, then extract it back out, entirely in your browser.
- Image to ASCII ArtConvert any image into ASCII text art, colored ANSI art, or Unicode braille dot art.
- Image ToolboxInspect image metadata, view and strip EXIF, and convert or resize with the editor panel.
- Photography CalculatorsDepth of field, hyperfocal distance, exposure value, ND filter times, and field of view in one text box.
- Placeholder ImagesGenerate a sized placeholder image as SVG markup, with a data URI, an img tag, and a CSS background-image ready to copy.
- SVG OptimizerRun SVGO in your browser to shrink SVG files, with byte-level before and after stats.
- EXIF Viewer and StripperSee every EXIF, XMP and IPTC field in a photo, then export a clean copy with all of it removed.
- Image to Data URLConvert an image to a base64 data URL, or decode a data URL back into a downloadable file.
- Image WatermarkOverlay a text or logo watermark on one image or a whole batch, with tiling, rotation and opacity.
- Meme GeneratorAdd classic caption text to any image and export it as a PNG, with no account and no watermark.
Media 10
- Spectrogram ViewerDraw a waveform and frequency spectrogram for any audio file, or extract and chart the audio track from a video first.
- Audio TrimmerCut a clip from an audio file, add fade in and fade out, and loudness normalize the result, right in your browser.
- Discord CompressorTwo pass encode that lands a video just under a chosen upload cap, computed from its length.
- GIF ToolboxResize, crop, optimize, reverse, slow down, speed up or split GIFs.
- Sprite Sheet PackerPack loose images into one texture atlas plus JSON frame coordinates.
- Subtitle EditorConvert between SRT and WebVTT subtitles, shift or resync cue timing from anchor points, and clean up messy captions.
- A/V ConverterConvert video and audio between MP4, WebM, MKV, GIF, MP3, WAV, and more, running ffmpeg locally in your browser.
- Frame ExtractorScrub any video frame by frame and save exact frames as full resolution PNG, JPEG, or WebP stills, including bursts.
- Video to GIFTrim a clip and export an optimized GIF with palette control, all in your browser.
- Video TrimmerCut video precisely in the browser using WebCodecs, re-encoding only what it must.
Audio 6
- Morse, DTMF and Audio DataTranslate Morse, generate and read DTMF keypad tones, and send text between devices through a speaker.
- BPM and Key DetectorFind the tempo and musical key of a track, or tap the tempo yourself.
- MIDI InspectorRead a .mid file event by event, or watch a live MIDI device, all in your browser.
- Signal GeneratorGenerate sine, square, triangle, sawtooth, noise, and swept tones for testing speakers, subwoofers, and hearing.
- Tuner & MetronomeTune any instrument from your microphone and run a sample accurate metronome, all in the browser.
- MP3 Tag EditorRead and edit ID3 tags and cover art on MP3 files in the browser.
Docs 4
- Document ConverterConvert DOCX, Markdown and HTML into PDF, and pull clean text back out again.
- Document ScannerTurn a phone photo of a page into a straightened, cropped, multi-page PDF.
- Font SubsetterStrip a font down to the characters you use and write it back out as WOFF2, WOFF, or OpenType.
- PDF ToolboxMerge, split, rotate, reorder, watermark, fill and sign PDFs in your browser.
QR 5
- Barcode GeneratorGenerate Code 128, EAN, UPC, Code 39, ITF-14 and Codabar barcodes as SVG, on their own or laid out on a print ready label sheet.
- QR Code GeneratorGenerate SVG and PNG QR codes with a center logo, from links, Wi-Fi, contacts, email, SMS, maps, and calendar events.
- QR Code ScannerScan a QR code with your camera or from an image, even when it is small, blurry, warped, or partly covered, and read the decoded link, Wi-Fi login, contact, or location without leaving the page.
- Animated QR File TransferMove a file between two devices that share no network by streaming it as animated QR codes and reading them back with a camera.
- Terminal QR CodePrint a scannable QR code as unicode blocks, right in your terminal.
Capture 5
- Element RecorderRecord a single element or a hand-drawn region of this tab to video, instead of the whole screen.
- Perceptual Image DiffCompare two images with pixel level and SSIM analysis at once, highlighting exactly what changed between them.
- Screen RecorderRecord your screen, a window, or a browser tab locally, with optional microphone and system audio, no account and no watermark.
- Screenshot AnnotatorDraw arrows, boxes, blur and numbered callouts on any screenshot.
- Screenshot BeautifierFrame code and screenshots with padding, a window chrome, and a gradient background.
Local AI 4
- TranscriberWhisper speech to text with timestamps, running entirely in your browser.
- Background RemoverCut people out of photos locally, with no credits and no uploads.
- OCRPull text out of images with tesseract, running in your browser.
- Image UpscalerEnlarge an image four times with Real-ESRGAN running in your browser.
Testers 13
- Display InfoLive readout of your screen resolution, pixel density, refresh rate, color capabilities, and input features.
- Gamepad TesterTest every button, trigger, and analog stick on a connected gamepad, and quantify analog stick drift precisely.
- Key Rollover TesterCheck N-key rollover and ghosting visually by holding down keys and watching a live diagram.
- Keyboard Layout HeatmapShow per key press counts and finger load for any pasted text, compared across ten common keyboard layouts.
- Keycode InfoShow a live readout of every keyboard event field: key, code, legacy keyCode, active modifiers, location, and repeat state.
- Media Key TesterVerify Media Session action handlers and hardware media keys, and see whether your headset or keyboard buttons actually reach the page.
- Monitor Test SuiteCheck your display for dead and stuck pixels, backlight bleed, ghosting, gradient banding, gamma, and more with a full catalog of classic test patterns.
- Mouse Polling Rate and DPI TesterMeasure a mouse's actual polling rate in Hz and real DPI from a physical move, not the numbers printed on the box.
- Multitouch TesterVisualize simultaneous touch points, dead zones, and stylus pressure.
- Oryx Layout DifferDiff two ZSA Moonlander layouts key by key from their keymap.c files.
- Webcam & Mic TestPreview your camera, test your microphone, and watch live audio levels before a call, entirely in your browser.
- Click Speed Test (CPS)Measure clicks per second over a 5, 10, 30, 60, or 100 second window, with a peak rate and a per second breakdown.
- Reaction Time TestMeasure visual reaction time across repeated trials, with false start detection and a comparison against typical human reaction.
Games 4
- Bingo Board MakerTurns a pasted list of items into randomized, printable bingo boards, with a seed for repeatable sets.
- Blueprint SurgeonDecode, inspect, repair and re-encode Factorio blueprint strings.
- Dice & Random PickerRoll dice from standard notation, flip coins, pick random items from a list, or split names into randomized even teams.
- Sudoku Generator and SolverGenerate puzzles with a unique solution at any difficulty, or paste one in to solve it and get step by step hints.
Hardware 8
- BLE Sensor DashboardConnect Bluetooth sensors, chart their readings live, and export CSV.
- Firmware FlasherFlash ESP32 and ESP8266 boards from the browser, no toolchain to install.
- HID Report ExplorerInspect the raw HID input reports streaming off any USB or Bluetooth device, decoded byte by byte with usage names.
- Light MeterTurn your camera into a light meter that estimates illuminance in lux or footcandles and color temperature in Kelvin.
- Mobile Sensors ExplorerLive compass, tilt, accelerometer, gyroscope and light readings from your device sensors.
- NFC Tag Reader and WriterEncode and decode NFC tag records, text, URLs, Wi-Fi credentials, vCards, and more, and write them from Android Chrome.
- Serial TerminalTalk to ESP32, Pico and other serial devices straight from the browser.
- UF2 InspectorDecode UF2 blocks, family IDs and memory ranges from a firmware file.
Electronics 9
- Battery Life EstimatorModel runtime from battery capacity, sleep draw, and active draw, in whatever units your datasheet uses.
- Ohm's Law & LED CalculatorSolve voltage, current, resistance, and power, plus LED resistor and voltage divider math.
- Resistor Color Code CalculatorDecode 3, 4, 5, and 6 band resistor color codes into resistance and tolerance, or encode a target resistance into bands.
- Wire Gauge CalculatorLook up AWG and metric wire sizes, calculate voltage drop over a run, and find the smallest gauge that meets ampacity.
- 555 Timer CalculatorCalculate astable and monostable 555 timer frequency, duty cycle, pulse width, and component values, with a wiring sketch.
- Capacitor Code DecoderDecode 3-digit and letter capacitor codes into capacitance, tolerance, voltage rating, and reactance, or generate a code from a target value.
- LED Resistor CalculatorWork out the current-limiting resistor for an LED from supply and forward voltage, with nearest E12, E24, and E96 standard values in both directions.
- PCB Trace Width CalculatorCalculate IPC-2221 trace width for a target current, copper weight, and temperature rise, or the max current a given width can carry.
- Voltage Divider CalculatorWork out output voltage, resistor values, loaded-divider sag, and common-supply ratio tables for a two-resistor divider.
3D Printing 3
- Bed Mesh VisualizerTurn 3D printer bed levelling output into a surface plot and a tramming verdict.
- G-code ViewerVisualize a G-code toolpath layer by layer, with filament, time and temperature stats.
- 3D Print Cost CalculatorFilament and electricity cost for a single print, with optional labor, machine wear, and markup.
Homelab 10
- Compose ConverterMove between docker compose YAML and docker run commands in either direction.
- GAM Command BuilderBuild correct GAM commands for Google Workspace admin tasks from plain English intent.
- Jinja Template TesterTest Home Assistant Jinja templates locally against sample entity state.
- LogQL & PromQL FormatterFormat and explain Loki and Prometheus queries in plain English.
- RAIDZ CalculatorCalculate usable capacity, parity overhead, fault tolerance, and mean time to data loss for a ZFS RAIDZ, dRAID, mirror, or stripe pool.
- Reverse Proxy Config GeneratorGenerate nginx and Caddy reverse proxy configs with TLS, websockets, and security headers.
- SMART DecoderPaste smartctl output and get a plain-English drive health verdict.
- systemd Unit BuilderGenerate a production-ready systemd service unit with sane restart, ordering, and security hardening.
- WireGuard ConfigGenerate WireGuard key pairs and ready-to-use configs with QR export for phones.
- Log File AnalyzerSummarize an access or application log: traffic, status codes, top paths, slow requests and errors, without uploading it anywhere.
Platform 6
- Bookmarklet ShelfTurn JavaScript into a bookmarklet URL, or use ready made bookmarklets for outlining elements and auditing any page.
- Clipboard InspectorSee every MIME type sitting on your clipboard with sizes and previews.
- Clipboard PipelinesSave a chain of text transforms and apply the whole chain to anything you paste.
- Echo EndpointA curl-able endpoint that reflects your request, headers, and IP back at you.
- Composable PipelinesChain this site's text tools into one flow, feeding each tool's output into the next, and share the whole pipeline as a URL.
- Screen RulerMeasure pixels and pick colors anywhere inside this browser tab.
Geo 7
- Airport Code LookupLook up an airport by IATA or ICAO code, name, or city, or enter two to get the great circle distance and bearing.
- Coordinate ConverterConvert between decimal degrees, DMS, UTM, MGRS, Plus Codes and geohashes in any direction.
- Country Code LookupLook up a country by ISO code, name, calling code, or top level domain and see its full profile.
- Distance and Bearing CalculatorGreat circle and WGS84 distance, initial and final bearing, midpoint, and magnetic declination between coordinates.
- GPX Track ViewerView GPX, KML and GeoJSON tracks with distance, elevation profile, speed stats and trimming, all in your browser.
- Sun & Golden Hour CalculatorSunrise, sunset, twilight, golden hour and shadow angles for any spot on any date.
- Wikidata Cities DatabaseBrowse and query a self-contained SQLite database of 7,622 world cities and 255 countries with curated starting queries.
Astronomy 5
- Julian Date ConverterConvert between calendar dates, Julian Date, Modified Julian Date and Unix time, with sidereal time and Delta T.
- Magnitude CalculatorConvert between apparent and absolute magnitude using the distance modulus, and work out flux ratios, combined magnitudes and surface brightness.
- Orbital Mechanics CalculatorCircular and elliptical orbit speeds, period, escape velocity, and a Hohmann transfer delta-v between two orbits, for the Sun, every planet, the Moon, Ceres and Pluto.
- Moon Phase CalculatorThe moon's phase, illumination, age and distance for any date, with the next four phases and moonrise for your location.
- Planet Positions and Rise TimesWhere the sun, the moon and the naked eye planets are for any place and date, with rise and set times, brightness and whether you can see them.
Weather & Earth 3
- Wind Chill, Heat Index and Dew Point CalculatorNWS wind chill and heat index, dew point, wet bulb temperature, humidex and apparent temperature from air temperature, humidity and wind speed.
- Pressure Altitude CalculatorPressure altitude, density altitude, altimeter setting and air density from station pressure, elevation and temperature, plus the reverse ISA lookup from altitude.
- Earthquake Magnitude and Energy CalculatorSeismic moment, radiated energy and TNT equivalent from earthquake magnitude, with comparisons to famous earthquakes, magnitude to magnitude energy ratios, and the reverse lookup from energy or moment.
Chemistry 15
- Chemical LookupSearch more than 25,000 compounds by name, CAS number, formula, or molar mass and read the properties, NFPA diamond, and GHS classification.
- GHS Pictogram LookupPick GHS pictograms or hazard codes and see which chemicals carry them, with the official symbols.
- Molar Mass CalculatorWork out the molar mass, percent composition, and atom counts of any chemical formula.
- NFPA 704 Fire DiamondSearch chemicals by their NFPA 704 diamond, or look one up by name, and download the diamond as an SVG.
- Periodic TableBrowse all 118 elements, color the table by a property trend, and read the detail for any element.
- Buffer CalculatorHenderson-Hasselbalch buffer pH and capacity from acid and conjugate base.
- Chemical Equation BalancerBalance any chemical equation automatically and show the working.
- Dilution CalculatorSolve C1V1 equals C2V2 for any missing concentration or volume.
- Electron Configuration ViewerAufbau order electron configuration and orbital diagram for any element.
- Empirical Formula CalculatorTurn mass percent composition into an empirical and molecular formula.
- Half-Life and Decay CalculatorRemaining quantity over time for any half-life, with a decay curve.
- Molarity and Solution PrepWork out moles, volume or concentration, with a step-by-step prep recipe.
- pH and pOH CalculatorConvert between pH, pOH, H+ and OH- concentration, including weak acids.
- Stoichiometry CalculatorMole ratios, limiting reactant and theoretical yield from a balanced equation.
- Isotope Abundance LookupNatural isotopes, abundance percentages and atomic mass contribution for any element, with the average mass checked against the published standard.
RF 9
- Electromagnetic Spectrum and Frequency AllocationsA to scale map of the electromagnetic spectrum plus a US frequency allocation chart: who uses each band, ham band plans, Wi-Fi and IoT channel tables, license rules and an FCC RF exposure calculator.
- Antenna Length CalculatorFull wave, half-wave dipole, quarter-wave vertical, and 5/8 wave antenna lengths for any frequency, plus a 3 element Yagi starter.
- Coax Cable Loss CalculatorSignal loss over a coax run by cable type, length, and frequency, with power delivered and a compare-all-cables view.
- dBm, Watts, and Volts ConverterConvert RF power between dBm, dBW, watts, Vrms, Vpp, and dBuV across 50, 75, or 600 ohm impedances, with a reference table.
- Fresnel Zone CalculatorFirst Fresnel zone radius, 60 percent clearance requirement, and earth bulge for a wireless link, with an optional obstacle clearance check.
- LC Resonance CalculatorResonant frequency of an LC circuit from any two of inductance, capacitance, and frequency, plus reactance, Q factor, and bandwidth.
- Path Loss and Link Budget CalculatorFree space path loss from frequency and distance, plus a full link budget from transmit power to received power and fade margin.
- VSWR and Return Loss ConverterConvert between VSWR, return loss, reflection coefficient, mismatch loss, and reflected power, with a reference table from 1.0 to 3.0 VSWR.
- Wavelength and Frequency ConverterConvert between frequency and wavelength for any part of the spectrum, with ITU band name, photon energy, and period.
Minecraft 15
- Minecraft Anvil CalculatorExact anvil level costs, optimal enchanted book merge order, and the Too Expensive horizon per Minecraft version.
- Minecraft Crop Growth and Breeding TimerExact growth times, farm layout throughput, bone meal costs, and animal breeding timers from the game's real random tick math.
- Minecraft Damage CalculatorArmor, fall, and mace smash damage per Minecraft version, verified against real dedicated servers and decompiled game code.
- Minecraft Elytra Flight CalculatorSimulates elytra glide physics tick by tick: distance from any height, firework cruise speed, rockets per trip, and durability.
- Minecraft Hunger and Saturation CalculatorSimulate hunger, saturation, exhaustion, and natural regeneration tick by tick, verified against decompiled game code.
- Minecraft Loot Table CalculatorExact drop chances and expected counts computed from the game's real per-version loot tables.
- Minecraft Mob Spawning SimulatorWhat spawns in a biome, what the mob cap allows, and what a farm will actually produce, per game version.
- Minecraft Projectile Trajectory CalculatorPlots arrow, trident, pearl and potion flight paths tick by tick per Minecraft version, with aim angles, range, drop and flight time.
- Minecraft Redstone Timing CalculatorConvert ticks to seconds, build exact repeater delays and clocks, plan hopper throughput, and invert the comparator container signal, per Minecraft version.
- Minecraft Villager Trade and Discount CalculatorReal per-version villager trades with the exact price after zombie cures, Hero of the Village, and demand.
- Minecraft XP CalculatorExact level-to-XP math, Mending repair costs, and kill counts, verified against decompiled game code.
- Minecraft Nether Portal CalculatorConvert Overworld and Nether coordinates on the 1:8 ratio, check whether two portals will link together, and see the distance a Nether shortcut saves.
- Minecraft Beacon CalculatorPyramid layer block counts, material cost in ingots, effect range and duration, and shared multi-beacon base totals.
- Minecraft Tick Time ConverterConvert between game ticks, redstone ticks, and real time, plus day cycle markers, /time add, and TPS versus MSPT.
- Minecraft Pixel Circle GeneratorBlock grid circles and ellipses at any size from 1 to 256, filled or outlined, with an exportable block count and per-row run lengths.