FLYMASTERMeasure
Measure a fish from a photo.
One picture with something of known size beside the fish, and the length is in the book. No tape, no wet hands on the phone, no guessing at the truck.
How it works
Three things in the frame.
- The fish, side on, flat.
- A dollar bill, a credit card or a ruler lying in the same plane. FlyMaster knows how long each one is.
- The nose and the fork of the tail. FlyMaster places them; you drag a handle if it is off.
The reference gives the scale, the two points give the length, and a standard weight table for the species gives an estimated weight. The number is yours to correct before it is saved.
Species
Named from the photo, picked from a list.
Forty-eight North American freshwater species are built in, trout and char, salmon, bass, pike and panfish among them, each with a plate and a field guide page. With AI assist on, the species is suggested from the photo; off, you pick it from the list. Either way the life list grows by one.
AI assist
Off until you turn it on.
The measuring points and the species can come from an AI model, and that means sending the photo to the company that runs it. FlyMaster never does that until you have read what is sent and agreed, on a screen that names the company. It is one switch in Settings, on any plan, and the app works fully without it: pick the species and tap the points yourself.
On the plan the photo goes to Anthropic's Claude through FlyMaster's server, which keeps no photos. Bring your own API key and it can be OpenAI or Google instead, straight from your phone. The privacy policy says exactly what leaves the phone.
Measure the next one.
Free to download. The plan starts with seven free days.