Frequently asked questions

Use Join for free in the navigation. You need a working email address, and you will be asked to confirm it before you start.

Choose Forgot password on the sign-in page. We will email a reset link to the address on your account.

Yes, from Settings → Danger zone. You get a 30-day grace period to undo it before it is permanent. You can also ask through the contact form and choose General if you'd rather a person handled it.

Maths, the sciences, computer science, history, writing, philosophy, psychology, engineering, art and music, for learners of any age, taught by dedicated AI tutors.

Yes. The Free plan includes every lesson and the AI tutor, with starter AI credits. Core is $15 a month and adds cloud sync across devices, 10 GB of storage and AI credits that refill daily.

Yes. Content can be downloaded for offline study, and your progress syncs automatically when you reconnect.

Progress saves to your account as you work, so you can stop mid-lesson and pick the same place up on another device.

Card payments, handled by Stripe. We do not take PayPal.

From your subscription page, which opens the Stripe billing portal. You can switch plan or cancel there.

AI credits are non-refundable once purchased. Exceptions: a billing error, or unused credits if you ask within 7 days of buying them. Contact us through the contact form with your account email and what you paid for.

Refresh first, then try a different browser or a private window, which rules out a stale cache or an extension. If it survives that, tell us through the contact form and say which browser you were on.

Through the contact form, choosing General. What we need is the page you were on, what you expected, what happened instead, and a screenshot if you have one.

Not yet. SFTS runs in a phone or tablet browser today, and a native app is in development.