CatchRules

Identify the fish.
Measure the fish.
Know the rules.

A compact iPhone reference for recreational anglers. Free fish identification — unlimited, no sign-up. Plus LiDAR measurement and current regulations for every U.S. state and Canadian province. Works offline.

Download on the App StoreBrowse regulations

Free · No sign-up · Unlimited fish ID

Built for the moment after you land it.

Most apps stop at identification. CatchRules keeps going: it measures the fish, checks the rules for your jurisdiction, and tells you whether it's legal to keep. All on your iPhone, all offline.

Capabilities

01

Identify

Photo in, species out. On-device classification across 1,500 fish. Free, unlimited, no sign-up.

02

Measure

LiDAR length from head-tap to tail-tap. Accurate to the centimeter in good light.

03

Rules

Size, bag, and season for all 50 states, 10 provinces, and federal waters.

How it works

  1. 1

    Photograph

    The model names the species in about a second.

  2. 2

    Measure

    Tap head, tap tail. LiDAR reads the exact length.

  3. 3

    Decide

    See the rules for your jurisdiction. Keep or release.

Questions

Is CatchRules free?
Yes — fish identification is free with no sign-up and no daily limit. No account, no email, no usage cap. Download from the App Store and start identifying.
Do I need an account to identify fish?
No account required. Identification works as soon as you install the app, with no email, sign-in, or registration step.
How many fish can I identify per day?
Unlimited. There is no daily cap on identification — photograph as many fish as you want.
Does it work offline?
Yes. Identification runs on-device, and downloaded regulations stay available without a signal.
What's covered?
Around 1,500 fish species for identification. Fishing regulations span every U.S. state, 10 Canadian provinces, and U.S. federal waters — bag, size, slot, and season rules, sourced from each state and provincial agency.
Is this a substitute for official regulations?
No. Always verify with your state, provincial, or federal wildlife agency before keeping a catch.

Catch smarter. Stay legal.

Download on the App Store

Free · No sign-up · Unlimited fish ID