Frequently asked questions

A visual taxon-identification game. Each round shows two photos and two names drawn from a matched pair of taxa; you drag each name onto the photo it belongs to. It's built to train the same pattern-recognition naturalists develop over years in the field, just compressed into short, repeatable rounds.

Everything traces back to iNaturalist — real observations submitted and identified by its community. Taxonomy, vernacular names, geographic range, and photos are all sourced (and periodically refreshed) from there.

Every pair carries a visual-similarity level, so a session can start easy — taxa that don't really resemble each other — and step up toward genuinely confusable look-alikes. You can also filter by taxonomic group, tag, geographic range, or difficulty, or follow a shared link straight to a specific pair.

Yes — DuoNat is free to play, in the browser or as an installable app.

Not a native one yet — publishing to the App Store requires a Mac to build and sign the app, and we don't have one. In the meantime, DuoNat runs well as a web app in Safari: open it, tap Share, then "Add to Home Screen" for a full-screen, app-like experience. If something doesn't behave well on iOS, tell us and we'll do our best to fix it — and if you'd like to speed up a native app arriving, a donated iPhone and/or MacBook is the most direct way to help. 😄

No — you can play right away. Signing in lets your progress and streak follow you across devices instead of staying local to one browser.

Coverage spans the tree of life and keeps growing. The stats page shows exactly which clades are represented right now, and how well each is covered across continents.

Every photo's info dialog in the app links back to its source observation on iNaturalist, and includes a report option — that feedback goes directly into a review queue.