Site index
Everything on CS42, in one place.
Every experiment, app, quiz, game and calm tool on CS42, plus the pages about the site. Grouped by section, so you can find anything at a glance.
Experiments
Ideas still being tested.
Early ideas put online to see how they hold up: live quizzes for a classroom, an app for reading well logs, a drawing game, and a lab for HYROX race results.
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The Platform
Live classroom quizzes on a curriculum question bank: students join with a PIN, and every game ends with a report by learning outcome. Ready for testing with a UAE Ministry of Education email, or on request.
cs42.org/platform_test -
Stratum
Well log analysis for oil and gas data: log plots, QC, open hole petrophysics, cement bond, pulsed neutron and production logging. Password protected while it is being tested.
Windows, macOS and hosted for teams -
Draw AI
Sketch anything and watch a model trained on 95 categories guess what it is while you are still drawing.
drawai.cs42.org (opens in a new tab) -
Split Lab
Where a HYROX time ranks, run by run and station by station, from the results of ten races in 2026. An unofficial fan project.
cs42.org/hyrox
Apps
Focused apps for iPhone.
Eleven native apps, private by default: nine on the App Store and two coming soon. Each one has its own privacy policy and terms, linked under it.
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PunchTrack
Out now
Counts your heavy-bag punches with the camera. No wearables, and session videos stay on your iPhone.
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PixelThat
Out now
Turns any photo into crisp pixel art, entirely offline.
Privacy policy for PixelThatTerms for PixelThatSupport for PixelThat
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42 PDF Editor
Out now
Annotate, fill, sign and stamp PDFs, read scans and convert Word files, on your device.
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Play
Quizzes, games and a piano.
Small things for a short break, each one quick to open and easy to put down. Nothing to install.
6 quizzes
Quizzes
Flags, capitals and the Arab world. Play solo against the clock, or open a room and race your friends live.
- CountriesFlags, capitals and populations, 5 questions a round. Solo or live multiplayer.
- Countries ExpertThe longer challenge, at 15 questions a round.
- Geography10 timed multiple-choice questions on capitals, flags and landmarks.
- اختبار الجغرافياThe geography quiz in Arabic: countries, capitals and landmarks.
- اختبار العالم العربي10 questions on the geography, history and culture of the Arab world, in Arabic.
- Custom QuizzesA mixed round of geography, science, history and culture.
7 games
Games
Arcade classics and two word games.
- Snake V1Classic arcade snake with a global leaderboard.
- Snake V2Pass through walls and collect power-ups.
- XO ChallengeTic-tac-toe against the computer at three levels, or a friend.
- Tanks DefenseDefend your base from incoming enemy tanks.
- SpellboundHear a word and spell it, from first words to the ones everyone misspells.
- Type StormA typing game: blast words, race cars, take tests and drill weak keys.
- Brick BreakerClear the wall with a bouncing ball, power-ups and combos.
Piano
Virtuoso Piano
A real piano that just opens. Play with a mouse, touch, your keyboard or MIDI. Free play, a practice mode that waits for the right key, guided lessons and about 30 tracks to learn.
Chill
Two calm tools.
A soundscape mixer and a breathing guide, for a quiet minute in the day. Nothing to install.
Studio
About the site.
What CS42 is, how to reach us, and how your details are handled.
- HomeWhere it all starts: the tools, games, experiments and apps on one page.
- AboutWhat CS42 is and how it works.
- ContactQuestions, feedback, ideas or a bug to report. We reply by email.
- PrivacyWhat the site collects, where it is stored, and how to have it deleted.
- Everything on CS42This page: the whole site, grouped by section.You are here
Can’t find what you are after? Write to us at hello@cs42.org and we will point you to it.
Get in touch