248+ iOS apps curated and reviewed
With an average user rating of 3.3★, the smell smile category is one of the App Store's strongest. Browse all 248+ apps we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | Nov 2026 | |
| 2 |  | Free | — | No | No | Aug 2026 | |
| 3 |  | Free | — | No | No | Oct 2026 | |
| 4 |  | Free | — | No | No | May 2026 | |
| 5 |  | Free | — | — | No | Aug 2026 | |
| 6 |  | Free | 4.8★ (89K) | Yes | No | Nov 2026 | |
| 7 |  | Free | 4.7★ (183K) | No | No | Nov 2026 | |
| 8 |  | Free | 1.0★ (1) | No | No | Jul 2026 |
This app invites users to participate in a scientific experiment by viewing images of smiling faces or landscapes for 20 days. It tracks mood changes and anonymously sends data to UCL to study the contagious nature of smiles and their impact on happiness.
