Four tools that put a model to work on your learning, each with its own workspace. Build a custom curriculum from your background, explain a paper, sharpen a prompt, or ask a tutor — and bring in your own material by uploading a PDF or referencing a link. Use your own API key for free, or the platform-funded Pro tier.
The entire encyclopedia, the Gym, and every Studio tool. Bring your own Anthropic API key; calls run from your browser and you pay the provider directly. No account needed.
The Studio tools with no key required: the platform funds the calls and meters usage, with a monthly allowance and pay-as-you-go beyond it. Your saved curriculum and progress sync across devices. Turns on once billing and the backend are configured.
The encyclopedia, the Gym, and bring-your-own-key tools are free, forever. Pro funds the AI calls for people who would rather not manage a key.