Postapp

postapp

Markov Chains, explained visually

Markov Chains, explained visually Interactive playground for building and watching Markov chains run 2026-08-06

XKPasswd

XKPasswd Generates strong, memorable passphrases, XKCD-comic style 2026-08-06

The Evolution of Trust

The Evolution of Trust A game-theory explainer playable on why trust breaks down and how it's rebuilt 2026-08-06

Your Life in Weeks

Your Life in Weeks Enter your birthday, see your whole life laid out as a grid of weeks 2026-08-06

Blobmaker

Blobmaker Generates a random organic blob shape you can copy as SVG code. 2026-08-06

Chaotic Pendulum

Chaotic Pendulum A tweakable double-pendulum physics toy — drag the parameters and watch chaotic motion unf in circulation·2026-08-06

Quick Todo List

Quick Todo List A fast to-do list you can start typing into immediately, no account 2026-08-06

One Million Checkboxes

One Million Checkboxes A million checkboxes shared by everyone on the internet at once — check, uncheck, repeat in circulation·2026-08-06

Lindy Books

Lindy Books Quietly read only the books that survived the ages in circulation·2026-07-24

Sandspiel

Sandspiel A falling-sand physics sandbox — place sand, water, fire, plant and watch them react 2026-08-06

Versa

Versa Automatically routes you to the best AI model for your use case in circulation·2026-07-24

Mechanical Watch

Mechanical Watch Drag-and-explore WebGL explainer of how a mechanical watch actually works 2026-08-06

WeekToDo

WeekToDo A minimalist weekly planner and to-do list, usable right in the browser 2026-08-06

Cryptii

Cryptii Chain together encodings and ciphers (Base32, Morse, hex, etc.) in the browser. 2026-08-06

fffuel

fffuel A hand-crafted set of free SVG generators for gradients, noise, patterns and shapes 2026-08-06

Monkeytype

Monkeytype A minimalistic, highly customizable typing speed test in circulation·2026-08-06

Modular Scale

Modular Scale Generates a proportional typography/spacing scale from a base size and ratio 2026-08-06

Shape Divider App

Shape Divider App Generates responsive SVG section dividers (waves, tilts, curves) for web pages 2026-08-06

Pixel Thoughts

Pixel Thoughts Type a worry into a star and watch it shrink to nothing over 60 seconds 2026-08-06

Yui

Yui Record lending and borrowing without spending money in circulation·2026-07-24

JSON Crack

JSON Crack Turns JSON/YAML/CSV/XML into an interactive, explorable graph. 2026-08-06

Silk

Silk Draw with your mouse and it turns into flowing, symmetrical generative art 2026-08-06

WindowSwap

WindowSwap Watch a real 10-minute window view from a random stranger's home somewhere in the world 2026-08-06

ZenPen

ZenPen A blank page that blurs everything except the sentence you're writing 2026-08-06