Biotadex turns every walk into a hunt. Point your camera at a plant, bird, bug or mushroom and get an ID in seconds, with an honest confidence score. Every species you find becomes a new entry in your own field guide, graded from Common to Very Rare.

Hold your phone up for five seconds and Listen tells you which birds and frogs are calling nearby. Crates at landmarks on the map hold numbered collectible stickers with fixed print runs that are never reprinted, and you can trade spares with friends. Players can claim real parks as sanctuaries by documenting their species.

Biotadex is free on iPhone and Android, with 10 scans a week (15 in your first week). Scan packs and Biotadex Pro (unlimited scans) are optional. I built it on my own, as a dad in Loveland, Colorado, who wanted an app that sends families outside.