Open Apps Studio

Open Apps Studio makes free, focused mobile apps — open-source versions of apps that are usually paid. No ads, no paywalls, no accounts.

Apps

(Open Source) Periodic Table — every element, isotope browser, trends, and chemistry tools.
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(Open Source) Lingo Lessons — learn 8 languages with short lessons, audio, and spaced repetition.
App Store · Source · Support · Privacy Policy
(Open Source) Mental Math — fast arithmetic training with timed tests, custom drills, and tricks.
App Store · Source · Support · Privacy Policy