Sculpt a custom oscillator waveform by tapping to add control points. The Web Audio API renders the resulting PeriodicWave through an OscillatorNode you can connect to your speakers.

Mobile-first beat sequencer with predefined instruments and genre style presets. Synthesises kicks, snares, hi-hats, toms, claps and bass using the Web Audio API.

Decode capacitor codes and calculate values from ceramic capacitor markings

Calculate contract rates and earnings based on working days and hourly rates

Convert distances between km, miles, yards, feet, meters, steps and more. Optionally set a travel speed to calculate how long a journey will take.

Calculate tax-inclusive (gross) and tax-exclusive (net) values with customizable tax rates and real-time conversion

Add and subtract time durations with hours, minutes, and seconds

Side-by-side comparison of ESP32 Supermini boards and specifications

Browse every Unicode emoji alongside the text screen readers announce. Compare how VoiceOver, Narrator, NVDA, JAWS, and TalkBack verbalise each one.

Drop a pixel font file and generate an 8x8 grid representation of each glyph. Supports TTF, OTF, WOFF, and WOFF2 formats.

Convert images or font files to Game Boy DMG tile data. Upload an image, align to an 8x8 grid, or load a font to generate character tiles. Edit individual tile pixels and export C header arrays.

Drop a Game Boy C/H source file to visualise and edit tile data inline, then download the modified source.

Game Boy variable-width font editor. Extract bitmap data and glyph widths from a font image using magenta (#FF00FF) width markers. Generates C arrays for VWF engines.

Paste a GraphQL SDL schema or an introspection query result, pick the root fields and types you need, and export a minimal valid trimmed schema with only the operations and types they reference.

Drop a JPEG to inspect every embedded metadata block — EXIF, GPS, XMP, IPTC, ICC profile, JFIF, and the raw JPEG segment map.

Drop a Markdown file or paste text and render it instantly with tables and syntax highlighting.

Upload two text files, view a colour-coded diff, and selectively apply individual changes from file 1 into file 2 with live re-diffing.

Paste an OpenAPI 3.x JSON schema, pick the endpoints you care about, and export a trimmed schema containing only those operations and the components they depend on.

View and manage GitHub organization notifications in a clean interface

Load package-lock.json or pnpm-lock.yaml from a local file or GitHub URL and browse the dependency tree with search and filtering.

Drop a PNG or JPG, trace it into black-and-white SVG paths, inspect with pan/zoom, then copy or download the SVG.

Extract metadata and Open Graph information from any URL

Validate JSON against a schema with real-time error reporting and syntax highlighting

Analyse a GitHub repository with contributor, churn, momentum, bug-cluster, and firefighting visualizations powered by the GitHub API.

A simple game timer with 15s restart and 30s single modes, featuring a wake lock option to keep the screen awake during use.

Test your movie knowledge by matching famous quotes to AFI's 100 greatest films of all time

Play the classic numbers round from Countdown - reach the target using arithmetic operations

Fifty tiny stories about what makes England… England.

Visual debugger for Home Assistant Assist intent recognition templates

Test and debug Home Assistant Jinja2 templates with real-time rendering and variable support.

Browser-based tool to bulk manage Immich albums - filter, delete, merge, and rename albums with regex and asset count filtering

Deduplicate photos in Immich. Compare duplicate pairs side-by-side, choose which to keep, and trash the rest. Album memberships are merged to the kept asset before trashing.

Bulk rotate images in Immich. Select multiple thumbnails to rotate clockwise or counter-clockwise en masse via the API.

Search Immich assets using arbitrary metadata queries and download the results as a zip file.

Find the elevation above sea level for any point on an interactive map. Drag the map under the centre pin or search for an address with OpenStreetMap; elevation data comes from the Open-Meteo API.

Compare showtimes across Brighton cinemas (Odeon, Cineworld, Duke of York's) and plan your movie outings

Schedule and coordinate cooking times for multiple dishes, with appliance conflict detection and a live step-by-step countdown timeline.

Upload a PayPal CSV and get a categorised spending report, powered by Gemini.

A simple page that tells you whether it is a full moon today, and when the next full moon is.

Track your daily reading progress and visualize pages read over time

An Android app that lets priority contacts break through silent, Do Not Disturb, and bedtime modes.

Fetch replies from Bluesky and Mastodon posts and extract structured information using Gemini, with prompt presets, IndexedDB caching, downloads and cost tracking.

Track recurring subscription costs with a monthly calendar view, currency conversion, and export/import support.

Upload an SRT subtitle file, shift all timings forward or backward with millisecond precision, then download the adjusted file.

Visualise the sunrise, solar-noon peak and sunset arc for any date, time and location. Defaults to today at the current moment, with a slider to scrub through the day.

A simple, data-driven workout tracker for tracking daily splits and exercises.

Interactive playground for CSS Anchor Positioning — drag the anchor, try every position-area, fallback, and visibility combo.

A VS Code-style command palette web component with keyboard navigation, filtering, and custom event dispatching

Interactive demo of the native HTML Popover API — no libraries, no JavaScript required for basic use

A live page editor: type directly into the page, toggle to raw HTML, edit minimal CSS in a side panel, and drag in files (images, fonts) that are cached in IndexedDB with nice names you can reference inside the page.

Demonstration of the Screen Wake Lock API to prevent device screen from dimming