Small apps and sites for the part of thinking that goes wrong quietly.

Pluto.Studio is an independent studio. We build Android apps and web products — reference tools that hold a lot of material and stay fast, and thinking tools about judgement, attention, and the gap between how people believe they decide and how they actually do.

One thing at a time, finished properly, then the next.

Web Live

IndieHangar Platform A hangar for indie Android apps in testing. Developers bring an app in and say what they need tested; testers join, send real feedback, and earn tokens they can invest in the apps they believe in. Those investments are what push an app up the catalogue. Open & closed testing Tester tokens for feedback Discovery earned, not bought AI Watermarks Reference From August 2026 the EU requires AI-generated content to carry a machine-readable mark, and Claude now weaves one into every response it writes. A tracker of who marks what, by which method, and whether anyone outside the company can actually check it. Every claim links to a primary source, and the gaps are left visible rather than guessed at. Tracker across providers Scanner that uploads nothing Open data, CC BY 4.0 EverySVG Editor A vector editor that runs in the browser tab you already have open. Draw rectangles, ellipses, lines, polygons and freeform pen paths with Bézier editing, organise them in layers, and export clean SVG source or PNG and JPG at whatever size you need. Eight companion tools handle the work around the drawing: converting, minifying, formatting, resizing, and reading colours and paths back out of a file. Editor plus 8 tools Client-side, nothing uploaded Free for commercial use

Android Google Play

Debias Thinking tool A cognitive bias trainer. Learn all 188 biases from the Cognitive Bias Codex, quiz yourself against real scenarios, and keep a reflection log that shows which biases shape your own decisions. 188 biases 18,869 scenarios Free with ads Pirate Codex Reference A companion handbook to One Piece. Profiles for every character, a location guide spanning the Four Blues, the Grand Line and the New World, and an encyclopedia of Devil Fruits, Haki and the factions behind them. Works offline. Characters & crews Lore & locations Offline access Fan-made and unofficial. Built from the One Piece Fandom Wiki. Sensor Lab Utility Fifteen tools built on the hardware already in your phone — compass, bubble level, sound and light meters, metal detector, QR scanner — plus a logger that records several sensors at once to CSV. Live data, no invented readings. 15 tools CSV logger Free with ads

ReframeIn testing Thinking tool A structured thought record for cognitive behavioural therapy practice. Currently in closed testing and not yet on Google Play.

Polkaboo Puzzle game A dot art puzzle game. Press and hold to grow polka dots and cover everyday objects, while a watching eye pops the dots it sees. On Google Play, and it plays in the browser too. 100 objects 120 palettes 10 languages Verbindung Language A trainer for German collocations, the pairings that make the language sound natural rather than merely correct. "Eine Entscheidung machen" is understood and wrong; a German speaker meets a decision. 2,490 of them, drilled with spaced repetition. 2,490 collocations English & Turkish Offline, no account

How we build Approach

An app should do one thing and then get out of the way.

Most apps in the self-improvement category are built to maximise the time you spend inside them. That incentive produces streaks, badges, and notifications engineered to nag — none of which make anyone think more clearly.

We would rather build something you open deliberately, use for four minutes, and close having actually learned something. Small scope, no account required to start, no engagement mechanics dressed up as features.

Contact Direct

Bug reports and feature requests get read.

There is no support desk and no ticket queue. Email reaches the person who wrote the code, which means fewer canned replies and slower answers at weekends.

studio.pluto.game@gmail.com