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Practice mode and per-subelement study are free, no catch. Full exam simulation and the spaced-repetition review queue unlock with the license key from your purchase receipt.

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How this works

Your key is checked directly against Lemon Squeezy, the payment processor handling this purchase. We never see or store the payment details, only that the key you entered is valid. Once confirmed, unlocking is saved in this browser's storage, so it applies here going forward. Your license key works on up to five browsers or devices, enter it again on each one. Clearing your browser data or switching devices doesn't use up a separate purchase, it just re-activates the same key.