Support

FishRuler measures using the LiDAR scanner, so it needs an iPhone fitted with one. That means the Pro models: iPhone 12 Pro / Pro Max and later. On a handset without LiDAR you'll see "This device does not support LiDAR" and measuring won't be possible. Please do check your model before purchasing.

Point the camera at the fish and tap once at the nose, once at the tail. A line is drawn between the two points and the distance is shown in centimetres. If a tap is out, drag the marker to fine-tune it, and press Reset to clear the measurement for the next fish.

The value on screen is a guide, based on what your device's depth sensor actually measures. Results are steadier in good light, with a steady hand, and with the fish laid as flat as you can manage. Treat it as a practical figure for use on the bank or the boat.

Please don't use it for that. For match measuring rules, minimum size limits set in law, or official record claims, always confirm with the measuring device those rules specify. Checking the regulations that apply where you fish remains your responsibility as the angler.

It does. FishRuler runs entirely offline. Rocky marks, upland streams, piers, out on the boat — it measures just the same with no reception at all.

It's a one-off purchase. Buy it once and there's nothing further to pay. No subscription, no in-app purchases and no adverts.

No. FishRuler collects no data at all and sends nothing off your device. The camera feed is processed on the handset purely for measuring, and the app never saves it.