FishRuler: Fish Size MeasureFishRuler: Fish Size Measure
Forgot the tape measure at the cabin? No worries. Point your iPhone at your catch, tap the nose and the tail, and read the length in centimetres — AR fish measuring, plain and simple.
Download on the App Store
Screenshots
Features
Tap the nose, then the tail
Aim the camera at your fish, then tap once at the nose and once at the tail. The distance between the two points appears on screen in centimetres. No reeling a tape back in, no struggling to hold it straight.
A little off? Drag it over
If a tap lands slightly off, drag the marker into place — no need to start over. A line joins the two points, so you can see exactly what you measured at a glance.
Measure and release quickly
Press Reset and the measurement clears, ready for the next one. Since you're not pinning the fish flat on a board, it spends less time out of the water.
Runs fully offline
Use it on a rocky shoreline, up a river, off the dock, or out on the lake — anywhere with no signal. No account, no sign-up, and nothing ever leaves your phone.
Fish and everything else
Measure rods, tackle, the cooler, boat hardware — whatever's in front of you. Useful well away from the water any time you need a quick length.
Pay once, no ads
Buy it once and it's yours. No subscription, no add-on purchases, no ads. And no data collection whatsoever.
You landed the fish. Now how long is it?
Cold wet hands, a walleye that won't lie still, a tape measure that's somewhere in the bottom of the boat — measuring a fish is never as simple as it sounds, and the fish is out of the water the whole time you're fumbling.
FishRuler turns your iPhone into the measuring tool you already have with you. Point the camera at your catch, tap the nose, tap the tail, and the length appears on screen in centimetres. That's the whole app.
HOW IT WORKS
- Tap two points, nose and tail, and read the distance between them
- Missed the spot? Drag either marker to fine-tune it without starting over
- A line is drawn between the two points so you can see exactly what was measured
- One tap on Reset and you're ready for the next fish
WHY ANGLERS LIKE IT
- Nothing to unroll, nothing to hold flat, nothing to lose over the gunwale
- Fast enough to measure and release quickly
- Works fully offline, which matters on a lake with no bars of service
- No account, no sign-up, no data collected
- Useful beyond fish, too: measure rods, coolers, boat fittings or anything else in front of you
Walleye and pike on the lake, lake trout in deep water, perch and bass off the dock, or a hole on the hard water in winter — if it lies flat in front of the camera, you can measure it.
A NOTE ON UNITS
Lengths are shown in centimetres. If you record your catches in inches, note that the reading is metric and convert it yourself.
BEFORE YOU BUY - DEVICE REQUIREMENT
FishRuler measures using the LiDAR scanner, so it needs an iPhone that has one: iPhone 12 Pro / Pro Max or a later Pro model. On a device without a LiDAR scanner the app will tell you it cannot measure. Please check your model before purchasing.
ABOUT ACCURACY AND REGULATIONS
Readings are real-world estimates produced by the device's depth sensor. Good light, a steady hand and a fish lying flat give the best results. Treat the number as a practical field measurement. For provincial size limits, tournament rules or official record submissions, always confirm with the measuring device those rules require.
One purchase. No subscription, no ads.