Sentinel
A pocket field guide for hikers and birders that uses your phone camera to identify plants and animals, then instantly flags whether what you just photographed is protected, recently delisted, or caught up in active habitat litigation.
Weekend hikers, amateur naturalists, and parents doing nature walks with kids who want to know what they're looking at
- Real-time on-device image ID for 1,500+ North American protected species with offline support
- Plain-language status card for every match ('Delisted 2024', 'Critical habitat under review', 'Suit filed May 2026')
- Trip log that auto-tags your sightings and exports a defensible record you can submit to state agencies
- Educational blurbs for kids with a 'why this matters' one-sentence hook per species
With habitat rules changing fast, a hiker who sees a spotted owl today needs to know if the rule that protected the tree it's nesting in still applies tomorrow — the policy volatility is the new urgency.
Plant/animal ID is an established consumer category (iNaturalist, Seek, Merlin, PictureThis, PlantNet) with millions of users, but the 'legal status overlay' is a niche sub-feature with no direct evidence of dedicated demand beyond general conservation curiosity (100+ Google searches for 'endangered species' in CA is modest).Top 10 Animal Identification Apps for Outdoor Adventurers and Hikers ↗Seek by iNaturalist ↗
Core ID space is crowded with free incumbents (iNaturalist, Seek, Merlin, PlantNet, Flora Incognita), and none surface legal status, recent delistings, or active habitat litigation — that regulatory overlay is genuinely unclaimed by any major field-guide app.Turn Your Phone Into a Field Guide: 5 Apps Every Explorer Needs ↗Using the Merlin Bird ID App to Identify Birds ↗
Dominant competitors (iNaturalist, Seek, Merlin) are completely free with no paywalls, and the legal/listing data comes from free public sources (USFWS, COSEWIC, Federal Register) — weak evidence that weekend hikers will pay a subscription just to see a protected/endangered badge on an ID.Is iNaturalist Free? Are there any subscription costs to use it? ↗Seek by iNaturalist — Revenue, Net Worth & Teardown ↗
ESA regulatory volatility is real and ongoing — FWS/NMFS proposed four new rules in Nov 2025 under Loper Bright, multiple delistings and critical-habitat challenges are litigating through federal courts, so the 'is it still protected?' question keeps getting newly relevant.Endangered Species Act Evolving? A Look at Significant Recent and Upcoming Changes ↗Reversing Course for Endangered Species Act: Administration Proposes... ↗
ID half is easy via wrapping existing models/datasets; legal half requires ingesting USFWS IPaC, Federal Register, ECOS delisting feeds and tracking active litigation (PACER/court dockets) — doable but the litigation-tracking pipeline adds real engineering and ongoing ops cost.Frequently Asked Questions - U.S. Fish and Wildlife Service ESA Proposed Rule ↗AI Birding & Wildlife Identification Guide 2026: Merlin Bird ID ↗