Measure your fish with a tap
FishRuler turns your iPhone into a fish ruler. Point the camera, tap the head and the tail — LiDAR × AR reads the exact length in an instant. No tape measure, no faff, works offline at any fishing mark.
See FishRuler in action
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Everything you need to size your catch
One-tap measuring
Point the camera at your fish, tap the head, tap the tail — that's the whole workflow. The length appears instantly as an AR line laid over the fish.
Drag markers to fine-tune
Placed a point slightly off? Just drag the start or end marker. The measurement updates live so you can nail the exact tip-to-tail length.
LiDAR × AR precision
FishRuler uses the LiDAR scanner in iPhone Pro models to read real-world depth, so the measurement reflects the actual distance — not a guess from a flat photo.
Instant results, down to 0.1 cm
The length is displayed in centimetres with 0.1 cm resolution the moment you place the second marker. No waiting, no processing screen.
Works completely offline
LiDAR and AR run entirely on your iPhone. Measure on a remote beach, on a boat offshore, or up on a windswept headland — no signal required.
No tape measure needed
Forget the wet, rusty measuring tape in your tackle box. Your iPhone is always in your pocket, and now it's a fish ruler too.
From small fry to metre-class
Mackerel, bass, bream, pike — FishRuler handles small pan-size catches and big specimen fish alike.
Simple by design
One screen, two taps, zero setup. No account, no adverts, nothing to configure. Open the app and you're measuring within seconds.
Private by default
FishRuler collects no personal data whatsoever. Camera frames are processed on-device only and never leave your iPhone.
Made for every kind of angler
Wherever you fish, knowing the exact size matters.
Shore & pier fishing
Check the size right on the spot and decide in seconds whether it's a keeper.
Boat fishing
Measure quickly on a rocking deck — tap, read, and get your line back in the water.
Catch & release
Minimise handling time. Measure in seconds and return the fish to the water safely.
Size regulations
Many species have minimum landing sizes. Verify the length before you keep your catch.
Personal bests
0.1 cm resolution means a new PB is never in doubt. Track your progress season by season.
Share your catch
Screenshot the AR measurement over your fish — proof of size built right into the photo.
Before cooking
Check the size at the kitchen counter to pick the right recipe — pan-fried, grilled or baked.
Fishing with kids
Kids love measuring their own catch. A fun, educational moment on every family trip.
Your next catch, measured in seconds
Free to download. Requires an iPhone Pro model with LiDAR.