Does it modify my original photos?
It sets the location field on the library asset via Apple's Photos framework — the same field the Photos app itself edits when you drag a photo onto the map. Pixels are never touched, and every write is journalled so Undo restores exactly what was there before, including “nothing”.
What if the app guesses wrong?
The app never silently guesses. Every placement is proposed to you first with its evidence — the anchors, the distance between them, the elapsed time drawn to scale. If the evidence is weak, it says so in plain words and draws no pin at all. And if a confirmed placement still turns out wrong, Undo restores the prior state exactly.
My camera's clock was set wrong. Is everything ruined?
No — this is expected, not an edge case. Wrong camera clocks are the rule: home time while travelling, plus everyday drift. The offset is detected by matching your camera's shooting pattern against your phone's, you check it on a live map preview, and every proposal uses the corrected time. More on cameras →
Why does it need full library access?
The whole method is reading the timeline around each untagged photo. With partial access the timeline has holes, and holes produce confidently wrong anchors — so the app asks for full access, explains why, and declines to guess without it.
Can I undo after quitting the app?
Yes. The undo journal is persistent — it is written before the photos are, so it is always complete. The one thing Undo will not do is overwrite a photo you've edited since — those are skipped and reported, never clobbered.
Do my photos leave my device?
No. The scan, the inference, the clock matching — all on-device. No accounts, no uploads, no “processing in the cloud”. The full privacy promise →
Can I get the locations as a file instead?
Yes — export confirmed placements as a GPX track and use it in Lightroom, exiftool or any geotagging tool you already trust. Your library stays untouched.
Does it work with RAW files?
Yes. Any camera whose photos end up in Apple Photos is supported — Canon CR3, Nikon NEF, Sony ARW, Fujifilm RAF, and JPEGs alike. Each camera body gets its own clock correction.
What happens to photos the app can't place?
They stay untouched, sorted into an honest bucket: uncertain groups show their route and their reason, and photos with no usable anchors at all wait for you to place them manually — or not. Skipping costs nothing; skipped groups simply return next time.
