Automatic fish measurement
Fish Measuring App for Fast, Hands-Free Measurements
FishLock uses your smartphone’s measurement capabilities to measure your catch automatically. No reference object is required, and the result can be saved with the fish species, photo, location and other catch details.
Measure fish as easily as taking a photo.
No ruler or reference object required.
Designed for measurements within ±0.25 inches.
Save measurements directly to your private catch log.
Measure without the extra setup
Measure a fish with your phone
Traditional catch measurement usually means placing the fish against a ruler, measuring board or another known reference. FishLock is designed to simplify that step by using supported smartphone measurement capabilities to estimate the fish’s length without a separate reference object.
FishLock’s measurement system is designed to reliably measure catches to within ±0.25 inches. Measurement performance metrics are available for reviewers and partners.
One catch workflow
Identify, measure and log in seconds
Fish measurement is more useful when it is connected to the rest of the catch. FishLock can identify the species, measure the fish, photograph it, map the catch and log it so the measurement becomes part of a complete fishing record rather than a number you have to copy somewhere else.
Automatic measurement
Fish species identification
Photo and location
Private catch log
Learn about FishLock’s fish identification app →
See how catches are logged →
species identification accuracy in testing
Designed for the water
Less handling, less manual entry
The goal is simple: reduce the number of separate steps between landing a fish and recording the catch. Instead of manually entering a measurement after the fact, FishLock keeps identification, measurement and logging together in one phone-based workflow.
Measurement support depends on the capabilities of your device. Use the FishLock measurement support checker before relying on automatic measurement.
Fish measuring app FAQ
Do I need a ruler or reference object?
No reference object is required for FishLock’s automatic measurement on supported devices.
How accurate is FishLock’s fish measurement?
FishLock is designed to reliably measure catches to within ±0.25 inches. Performance metrics are available for reviewers and partners.
Does automatic measurement work on every phone?
No. Measurement depends on device capabilities. Check whether your device supports FishLock measurement →
Can I save the measurement with the catch?
Yes. FishLock can save the size together with other catch details in your private fishing log.