ostudyA cloud provider
Claude, DeepSeek or OpenRouter with your own key. You pay the provider directly, with no study-app subscription.
Study on your own terms, on your own device.
ostudy is a free, open-source study app for flashcards, documents and study guides. Your library lives with you, and you decide which AI helps, if any.
Linux and Android today. MIT licence.
Flashcards
No account. No subscription.
Write Basic, Reverse and Fill in the blank cards, or bring your Anki decks across. Rate each card Wrong, Hard, Medium or Easy, and spaced repetition decides when you see it next.
More about flashcards
Example card
Which chamber of the heart pumps blood to the body?
The left ventricle
Documents
Your textbooks and lecture materials, turned into a study plan
- 01
Read and mark
PDFs live in your library; mark what matters as you read.
- 02
Get a study guide
Chapter by chapter, linked back to the page it came from.
- 03
Turn it into cards
Drafts you check and edit before you study them.
- 04
Ask the Tutor
Questions about your own material, when you get stuck.
Your AI, your choice
Use the AI you prefer, or none at all
Cards and review never need AI. For documents and the Tutor, connect a provider you choose. ostudy never switches providers for you.
A model you run
A llama.cpp server with a GGUF model, on this computer or one you trust.
No AI
Write your own cards and study offline. Everything else still works.
Your library stays yours
- Works offline
- Whole-library backups
- Sync between your own devices
- Share decks without your review history
Get ostudy
Linux and Android now, built from source. Windows, macOS and iOS are planned.