Need a hand?
Email us and we'll usually get back within a couple of days. Please include your device model, your iOS version, and the app version (Settings → About).
FAQ
Can I use it without a connection?
Yes. On first launch the app stores the course content and figures on your device, so questions, solutions, and concept cards all work fully offline afterwards.
Does the content update itself?
Yes. Each launch the app asks our server whether a newer version of the content exists; if so it downloads in the background and you'll have it the next time you open the app. You can also update manually in Settings → Course content → Refresh.
Will my progress transfer to a new phone?
Only if you sign in. In visitor mode progress lives on the device itself (an iCloud backup carries it over, but it doesn't sync between devices). Sign in and your progress follows you to a new phone.
Can I switch between Traditional Chinese, Simplified Chinese, and English?
Yes — pick one in Settings → Language. The course content itself is bilingual.
Is my work uploaded anywhere?
Not unless you sign in. As a visitor everything stays on your device and we never receive it. If you sign in, your study progress is synced to our server so it can continue on a new phone — your handwritten notes are never uploaded.
Do I need an account?
No. Download it and start; your progress is saved either way. You only need an account to sync across devices.
Will I lose my progress when I sign in?
No. The progress you had on this device before signing in is merged into your account, and from then on signing in to the same account on another phone shows the same progress.
What about signing out?
The progress on this device is cleared (so the next person to sign in cannot see your records), but the copy on our server is kept — you get it back when you sign in again.
Will anyone else see my data if I sign in?
No. We store only your email address, your name (if Apple or Google give one), and your study progress. We do not sell it to anyone and do not share it with third parties.