Balloon simulator! Inflate letters into floating foil balloons you can grab and swat, then save and send to friends and family. It's a party for everyone.

Seamless geometric pattern maker: 64 tile families (Truchet, girih, weave), custom palettes, deterministic seeds, and SVG, PNG, or 3D-print STL export.

Interactive circle of fifths that plays real four-part voice leading. Find the diatonic chords in any key, explore all seven modes, build progressions you can hear.

Brick ASMR is an infinite hands-on pile of toy bricks with real-time physics and responsive rummaging sound — brush, dig, pick up, shake, and relax. Like a LEGO bin!

Retrowave Road generates an endless synthwave highway — seeded neon worlds, a generative 80s soundtrack. Like, totally tubular. Awesome!

Check whether your WordPress plugin idea already exists. Search the live WordPress.org directory for rivals, install bands, recent reviews, and real gaps.

Carve a 3D jack-o-lantern from 100 stencils or your own photo, print the stencil for a real pumpkin, or let auto-play run it as a screen saver.

Walkable / flyable winter simulator: a moonlit alpine valley of snowy forest, lantern-lit cabins, and a frozen lake, generated live from a seed. Export your journey.

102 procedural 3D houseplants in fired clay. Arrange eight in a greenhouse, shape the leaves, move the sun, and save a 2560px photograph.

Aurora borealis simulator and northern lights screensaver with KP storm control, procedural curtains, live substorms. Never loops. Works year-round from your location!

Generate endless procedural wood-grain patterns in real wood species and export them as wallpaper and design backgrounds. Free, in your browser.

How much gravel, topsoil, tile, drywall, sod or grass seed do you need? 20 free calculators give the bags, gallons, sheets and pallets to buy.

A virtual rock collection you can handle: tumble, stack and study 286 minerals, rocks, gems, fossils and meteorites with real hardness, streak and luster.

A calming 3D wooden block sandbox with satisfying, ASMR-style wood clacks. Stack, fling, and topple real physics blocks. No score — just relax and play.

Add a hand-drawn line boil to any sketch, or trace a photo into line art. Recolor the ink and export a transparent GIF, a video, or a PNG frame set.

Nine tuned mallet instruments in your browser — xylophone, marimba, vibraphone, glockenspiel and more. Record a tune or just "fiddle" around. Play us a song...

Measure the real report rate of your finger, stylus, trackpad or mouse, in Hz and in milliseconds, against your screen's actual refresh rate.

Generate a matching Twitch panel set, banner, offline screen, avatar, emotes and animated panels in one roll. YouTube and Discord too. No signup. For live streamers!

Free 3D fireworks simulator that dances to your music or live mic. 43 real shell types, an orbit camera, holiday palettes, and MP4 export — a browser FWsim alternative.