FishRuler: Fish Size MeasureFishRuler: Fish Size Measure
Left the tape in the tacklebox? She'll be right. Point your iPhone at the fish, tap the nose and the tail, and there's your length in centimetres — then it goes straight into your own logbook, right on your phone.
Download on the App StoreScreenshots
Features
Tap the nose, tap the tail
Point the camera at your fish, tap once on the nose and once on the tail. The distance between the two shows up on screen in centimetres. No reeling a tape back in, no wrangling it straight along the fish.
A bit out? Just drag it across
If a tap lands off the mark, drag the marker into place — no starting from scratch. A line runs between the two points, so you can see exactly what you measured in one look.
Measure it, release it
Hit Reset and you're clear for the next one. You're not pinning the fish flat on a brag mat, so it's out of the water for a whole lot less time.
Keep a logbook of every catch
Save the species, length, a photo, where you got it and when — all in a logbook that lives on your phone. Look back on the whole season, or just one ripper day, whenever you like.
See your personal bests
FishRuler checks every new catch against your logbook and flags it when it's your biggest yet for that species. A low-key way to watch your personal bests stack 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.
Reference release-size info, where it's available
For a handful of species and areas where an official minimum or slot size is publicly documented, FishRuler can show it alongside your measurement as a reference point — never as a guarantee. Coverage's limited and grows slowly on purpose: better to show nothing than a figure we can't back up.
Runs completely offline
Off the rocks, up the creek, on the breakwall or well offshore — no reception, no worries. No account, no sign-up, and your logbook never leaves your phone unless you choose to share a card.
Not just for fish
Rods, tackle, the esky, boat fittings — if it's in front of you, you can measure it. Comes in handy well away from the water whenever you need a quick length.
Pay once, no ads
Buy it once and it's yours. No subscription, no extra purchases, no ads.
You've got it in the boat. Now how long is it — and will you remember by next season?
Wet hands, a fish that won't sit still, a brag mat that's somewhere under the tackle box — measuring a fish is never as easy as it should be, and every second counts if it's going back.
FishRuler turns your iPhone into the measuring tool you've already got with you. Point the camera at your catch, tap the nose, tap the tail, and the length appears on screen in centimetres. 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
- Tapped a bit off? 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
- 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 on one card
- FishRuler tracks your personal best per species automatically. Beat your record and the app tells you straight 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 over the side
- Quick enough to measure and release without a long handling time
- Works fully offline, so it's fine up the creek or off the beach with no reception
- No account, no sign-up. Your log stays on your device
- Handy beyond fish too: measure rods, eskies, boat fittings or anything else in front of you
Barra up north, bream and flathead in the estuaries, snapper offshore, or a whiting session off the sand — if it lies flat in front of the camera, you can measure it.
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. It also requires iOS 17 or later, so please check both your model and iOS version before purchasing.
ABOUT ACCURACY AND SIZE LIMITS
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 on-the-water measurement. This app is not a substitute for an approved measuring device: for legal size limits, tournament rules or record claims, always confirm with the measuring device the rules in your state require.
ABOUT THE SIZE REFERENCE NOTE
For a small number of species, FishRuler can also show a reference note if a catch falls outside a size range. This is for your information only. It is not a full or authoritative list of regulations and does not replace checking the current rules for your state before you keep a fish.
One purchase. No subscription, no ads.