DayLine uses Apple's low-power visit monitoring and significant-change location services — not continuous GPS — so battery impact is minimal. Each location fix is converted to a state (or country) on your device and added to your day ledger. For best results, allow "Always" location access so days are recorded even when the app is closed.
Open the Calendar tab and tap any day to inspect or correct it. Days with no data appear as empty cells — tap one to backfill it. The Dashboard also surfaces missing days and days with sparse data so nothing slips through unreviewed. Every correction is logged as a manual entry, keeping your audit trail transparent.
Settings → "Switch from another app" accepts CSV, text, and PDF exports from other day-tracking apps. Export your history from your current app, choose the file in DayLine, and pick whether existing days should be kept or overwritten. Trouble with a specific file? Email it to support and we'll take a look.
Subscriptions are billed by Apple. To change or cancel: iPhone Settings → your name → Subscriptions → DayLine. Cancelling takes effect at the end of the current billing period. The 30-day free trial never converts to a paid subscription on its own.
Everything lives on your device, so DayLine's data is included in your normal iPhone backups. You can also create a portable backup file anytime in Settings → Export backup, and restore it on a new phone with Settings → Restore.
The short answer: your data never leaves your phone. The full policy is here.