DiveDex: Fish & Reef ID

Name what you see underwater — instantly, and completely offline.

DiveDex turns your phone into a live marine-life field guide. Point your camera at a fish, coral, nudibranch or crab and it identifies the species in real time, right on the device. No signal, no account, no uploads — perfect for the boat, the reef, or a remote freshwater lake where there's no bar of reception.

Built by a diver, for divers.

IDENTIFY ANYTHING AQUATIC • Real-time identification from your live camera — just center the creature in the frame. • Powered by the open BioCLIP model running 100% on-device. • Thousands of species across the tree of life: reef and pelagic fish, freshwater fish, corals, nudibranchs, crustaceans, cephalopods, echinoderms and more. • Confidence you can trust — DiveDex captures the clearest, most-confident moment so the ID you save is the one you actually saw.

WORKS 100% OFFLINE • Everything runs on your phone. Your photos and your location never leave the device. • The species model and reef catalogue download once on first launch; after that you're fully offline. • Add more with free downloadable packs — sharks & rays, nudibranchs, corals, freshwater and more — only what you want.

LOG EVERY DIVE • Auto-record a dive and see every species you spotted, organised by dive. • An offline gallery of your captures you can browse and revisit any time.

BEAUTIFUL, SHAREABLE ID CARDS • Every shot becomes a polished 4:5 card — species name, place, and date — ready to post. • Photos are geotagged with your surface location and stamped with a reverse-geocoded place.

CONTRIBUTE TO CITIZEN SCIENCE • Save a clean, geotagged original ready to submit to iNaturalist. • Cross-check any ID against iNaturalist records near your dive site — a quick sanity check on whether a species is really found where you are. • Your confirmed sightings help build open marine-biodiversity data.

PRIVATE BY DESIGN • No account. No ads. No tracking. No analytics. • Identification happens entirely on-device; nothing about your dives is uploaded unless you choose to share a photo.

DiveDex is a naturalist's tool for curiosity and record-keeping — not a substitute for professional judgement, and never a dive-safety or navigation instrument.