Thanks for using Mistake Book. Your questions stay on your iPhone. Nothing is uploaded to our servers.
Email [email protected]
Please include:
The text from a photo looks wrong
Crop tightly around one question, use a straight, well-lit photo, then edit the text before saving. Handwriting and maths may need manual edits. The photo is the source of truth.
When do reviews appear?
Due dates follow 1, 3, 7, and 14 days. Reminders are local notifications on this iPhone.
How do I back up?
Settings → Export Backup (ZIP). Import adds new mistakes and skips ones already on the device.
Mistake Book does not require an account.
Last updated: 15 August 2026
Mistake Book is a local-first study app. We do not collect, sell, or upload your personal data.
What stays on your iPhone
Questions, answers, photos, tags, review dates, reminders, and backups you export are stored on this device (or in a ZIP file you choose to save). We do not have a server that receives this content.