Build courses at the rate you learn
Start free with GPT-5.6 Luna at max reasoning effort. Upgrade for Claude Sonnet 5 and Fable 5 — Anthropic's production model and its newest flagship — when you want the highest-quality visuals and structure.
Free
$0/mo
Try it out, no card.
50 credits per month — many courses at Luna's rate
GPT-5.6 Luna — max reasoning effort, free
Public courses, shareable with anyone
Pro
Most popular$9/mo
For serious self-study.
500 credits per month
Claude Sonnet 5 + Fable 5 — Anthropic's production model and flagship visuals
Top-ups available (+100 cr / $3, +500 cr / $12)
Private courses, owner-only by default
Group
$15/mo
For study buddies.
1,000 credits per month
Claude Sonnet 5 + Fable 5 — shared across all members
Up to 5 friends share the credit pool
Shared progress view
How are credits used?
Credits track what your generations really cost: usage is billed at each model's actual per-token price. A typical course costs only a few credits on the free GPT-5.6 Luna, more on Claude Sonnet 5, and the most on Claude Fable 5, which trades more credits for stronger reasoning and visuals — the model picker shows each model's live cost multiple. You can see what each chat reply cost in the bubble's footer.
Can I cancel any time?
Yes — manage your subscription from the billing page. Your plan's monthly credits stay valid until the end of the current cycle, and any purchased top-up credits you've bought roll over and never expire.