Point your camera at any fish, coral or critter — DiveDex identifies it on the spot, and works 100% offline.
Free · no account · nothing leaves your phone. iPhone, iOS 16+. Android coming soon.
Reef and pelagic fish, freshwater fish, corals, nudibranchs, crustaceans, cephalopods, echinoderms and more, identified on-device by the open BioCLIP model. Add free species packs for exactly the life you dive with.
Turn on auto-record and DiveDex keeps a tally of every species you spotted, organised dive by dive — plus an offline gallery of your captures you can revisit any time.
When you're back online, cross-check any ID against iNaturalist records near your dive site — a quick sanity check on whether a species is actually found where you saw it. Then contribute your confirmed sighting to science.
DiveDex has no account, no ads, no tracking, and no analytics. Identification happens entirely on your phone — nothing about your dives is uploaded unless you choose to share a photo.
Runs on-device after a one-time model download. No signal needed on the boat or the reef.
No sign-up, no email, no login. Open it and go.
No analytics, ads or trackers. We never receive your photos or your location.
Data leaves your phone only when you tap Share or Check on iNaturalist.
A mechanical engineer turned full-time diving professional — TDI Trimix & KISS Sidewinder CCR instructor and PADI Staff Instructor across the Maldives, Sri Lanka and India. DiveDex grew out of wanting to name what he sees underwater — on-device and offline.
DiveDex is free on the App Store. Offline, and built for divers. Android coming soon.