249+ iOS apps curated and reviewed
Finding the right leave no trace citizen science apps can be overwhelming with so many options. We've analyzed 249+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (1) | No | No | Oct 2026 | |
| 2 |  | Free | 4.7★ (26K) | No | No | Nov 2026 | |
| 3 |  | Free | — | No | No | May 2026 | |
| 4 |  | Free | — | No | No | Oct 2026 | |
| 5 |  | Free | 4.8★ (1.4K) | No | No | Nov 2026 | |
| 6 |  | Free | 4.7★ (6) | Yes | No | Oct 2026 | |
| 7 |  | Free | — | No | No | May 2026 | |
| 8 |  | Free | 4.3★ (41K) | No | No | Nov 2026 |
Empower volunteers to monitor outdoor resource conditions over time. This citizen science application supports the mission of protecting natural spaces through responsible enjoyment and education.
Easily manage your Citizen watch ownership. Identify your timepiece using tag scan, watch scan, or manual entry. Access setting instructions, activate your warranty, and store proof of purchase all within the app.
