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Hearts limit how many mistakes you can make in the lessons and quizzes — you lose one for each wrong answer. When they run out, new lessons pause so you can review instead of guessing. Hearts refill automatically over time (one every 20 minutes), and the app shows you exactly when the next one arrives.

You earn XP by finishing lessons, completing a molecule in the Build lab, and working through flashcard decks. Doing anything that earns XP on a given day keeps your daily streak alive. Miss a full day and the streak resets. It's a nudge to keep coming back for a few minutes.

No. Chemigo works fully without an account, and your progress always saves on your device. Sign in with Apple is optional; it links your progress to your Apple ID so it stays with you. Everything stays private to your own iCloud.

Yes, as long as you're signed in to the same iCloud account on each device. Progress syncs through your private CloudKit database. If iCloud isn't available, the app keeps everything safely on the device instead.

Open the You tab, then Settings. “Reset all progress” clears your XP, streak, lessons, and cards but keeps your name and sign-in. “Delete account & data” wipes everything and unlinks your Apple ID, on the device and in your private iCloud. Both actions can't be undone.

No. There's no tracking, no analytics, and no ads. See the privacy policy for the full details.

Yes — the content is written at a real introductory-course level (octet rule, VSEPR shapes, Lewis structures, reaction mechanisms) using proper terminology, just with a friendlier voice. It's built to reinforce what you'd see in a general or organic chemistry class, not to replace it.

Yes. MoleMates was renamed Chemigo in July 2026: same app, same characters, same chemistry, with a rebuilt interface. Nothing about your progress or privacy changed with the name.