Point your iPhone at your catch, tap nose and tail, read the length in cm. New: save catches to your log and see your personal best per species. Uses LiDAR on Pro models.
AR tape measure for anglers
You landed the fish. Now how long is it — and will you remember by next season?
Reaching for a tape measure with wet hands, holding a thrashing fish flat, keeping the tape straight — it never works the way it should, and the fish is losing time out of the water while you fumble.
FishRuler turns your iPhone into the measuring tool you actually have with you. Point the camera at your catch, tap the nose, tap the tail, and the length appears on screen in centimeters. Save it to your log with one tap, and it's never lost again.
HOW IT WORKS
• Tap two points — nose and tail — and read the distance between them
• Missed the spot? Drag either marker to fine-tune without starting over
• A line is drawn between the two points so you can see exactly what was measured
• Save the catch with a photo, species, spot and date, or hit Reset and move on
YOUR CATCH LOG
• Every saved catch lives in a scrollable log — photo, species, length, spot and date, all in one card
• FishRuler tracks your personal best per species automatically. Beat your record and the app tells you right away
• Best-ever catches stand out in the log so your top fish are always easy to find
• Turn any catch card into a single image, ready to share
WHY ANGLERS LIKE IT
• Nothing to unroll, nothing to hold flat, nothing to lose overboard
• Fast enough to measure and release quickly
• Works fully offline — no signal needed at the lake, river or jetty
• No account, no sign-up. Your log stays on your device
• Useful beyond fish, too: measure gear, coolers, boat fittings or anything else in front of you
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 later Pro models. On a device without a LiDAR scanner the app will tell you it cannot measure. It also requires iOS 17 or later, so please check both your model and iOS version before purchasing.
ABOUT ACCURACY
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 tournament rules, legal size limits or official record submissions, always confirm with the measuring device that the rules require.
ABOUT THE SIZE REFERENCE NOTE
For a small number of species and regions, FishRuler can show a reference note if a catch falls outside the usual take-home size range. This is for your information only — it is not a full or authoritative list of regulations, and it does not replace checking current rules with your local fisheries authority before you keep a fish.
One purchase. No subscription, no ads.
Tap the nose, tap the tail
Aim the camera at your fish, tap once at the nose and once at the tail. The distance between the two points shows up on screen in centimeters. No rewinding a tape, no fighting to keep it straight.
Off by a bit? Just drag it
If a tap lands slightly off, drag the marker to nudge it into place — no need to start over. A line connects the two points, so you can see exactly what you measured at a glance.
Measure and release fast
Hit Reset and the measurement clears, ready for the next fish. Since you're not wrestling the fish flat against a board, it spends less time out of the water.
Keep a logbook of every catch
Save the species, length, a photo, where you caught it, and when — all in a logbook that lives on your phone. Look back on the season, or just one great day, whenever you want.
See your personal bests
FishRuler checks each new catch against your logbook and flags it when it's your biggest yet for that species. A quiet way to watch your personal records add up over time.
Turn a catch into a shareable card
Export any logged catch as a clean image card with the photo, species, and length, then share it however you like using your phone's own share sheet.
Which iPhones does it work on?
FishRuler measures with the LiDAR scanner, so it needs an iPhone that has one. That means the Pro models: iPhone 12 Pro / Pro Max and later. On a device without LiDAR you'll see "This device does not support LiDAR" and measuring won't be available. Please check your model before buying.
Do I need to update iOS to use it?
Yes — FishRuler requires iOS 17 or later, since the logbook is built on Apple's newer on-device storage framework. If your iPhone can't update to iOS 17, the app won't install. Most LiDAR-capable iPhones can run iOS 17 without issue, but it's worth checking your software version before buying.
How do I use it?
Point the camera at the fish, tap once at the nose and once at the tail. A line is drawn between the two points and the distance appears in centimeters. If a tap is off, drag the marker to fine-tune it, and press Reset to clear the measurement for the next fish.
Are my measurements saved? Can I look back at old catches?
Yes. When you save a measurement, it goes into your logbook along with a photo, species, location name, and date, so you can browse past catches any time. Nothing is saved automatically — you choose which measurements to log.
Top comments (0)