CatchRules - Fish ID & Rules

Identify ~1,500 fish species, measure them with LiDAR, and look up fishing regulations for every U.S. state and Canadian province. Built for recreational anglers.

CatchRules is a compact iPhone reference tool that combines the three things anglers actually need on the water — a fish identifier, a measuring tool, and a jurisdiction-aware rules lookup — with tides and a catch log on top.

IDENTIFY ANY FISH, OFFLINE

Photograph your catch and CatchRules names the species in about a second. The on-device AI classifier recognizes 1,494 fish species, from largemouth bass and rainbow trout to halibut, red drum, Chinook salmon, and hundreds more. No internet, no cloud upload, no account. Works at the dock, on the boat, or deep in the backcountry.

MEASURE WITH LiDAR

Tap the fish's head. Tap its tail. LiDAR-equipped iPhones (Pro models, iPhone 12 Pro and newer) read the length in seconds, accurate to the centimeter in good light. No ruler, no tape, no guesswork. Reference only — always confirm legal size with a physical ruler before keeping a catch.

RULES FOR EVERY STATE AND PROVINCE

65 jurisdictions in total: • All 50 U.S. states • All 10 Canadian provinces • 3 Canadian territories (Yukon, Northwest Territories, Nunavut) • U.S. federal waters (NOAA) • Canadian federal waters (DFO)

Look up size limits, daily bag limits, possession limits, open seasons, and slot rules for thousands of species. Downloaded regulations stay available offline. No signal, no problem.

TIDES & CURRENTS

NOAA and CHS tide predictions for coastal fishing stations across North America. Today's highs and lows, a full 12-hour curve, and upcoming events at your nearest station. Plan your trip around the bite.

LOG EVERY CATCH

Every identification lands in your personal collection. Build a visual log of every species you've photographed, with dates, locations, and measured lengths. Track milestones; revisit every trip.

CATCHRULES PRO

Unlock the full reference toolkit: • Unlimited Species ID — no daily caps on identifications • Proprietary Fun Facts — hand-curated notes on 1,500+ species • All 65 Jurisdictions — every U.S. state and all of Canada • GPS Zone Matching — auto-finds your nearest fishing zone • Species Photos in Rules — see each species right in the rules screen • Tides Anywhere — any station, not just your nearest

Monthly and yearly plans available. Cancel anytime. Subscription auto-renews.

REFERENCE ONLY

Regulations, species identifications, and measurements in CatchRules are provided for informational purposes only and have no legal force. Fishing rules change frequently, including emergency closures and in-season modifications. Always verify current regulations with your state, provincial, or federal wildlife agency before keeping a catch.

Not affiliated with any government agency.

Built with respect for fisheries, anglers, and the agencies that manage them.