245+ iOS apps curated and reviewed
The best norwegian 4x4 heart rate apps on iPhone average 4.4★ across 245+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (1) | No | No | Jun 2026 | |
| 2 |  | Free | 4.8★ (61) | No | Yes | Oct 2026 | |
| 3 |  | Free | 5.0★ (3) | No | Yes | Sep 2026 | |
| 4 |  | Free | — | No | Yes | Oct 2026 | |
| 5 |  | $5.99 | 4.3★ (50) | No | No | Oct 2026 | |
| 6 |  | Free | — | Yes | Yes | Sep 2026 | |
| 7 |  | Free | — | No | Yes | Oct 2026 | |
| 8 |  | Free | — | No | No | Aug 2026 |
This app guides you through the Norwegian 4x4 VO2max interval training protocol using your Bluetooth heart rate monitor. It provides real-time audio cues to keep you in your target heart rate zones during work and rest intervals.
This app guides you through the Norwegian 4x4 interval training protocol to improve your VO2 max and cardiovascular fitness. It offers customizable warm-up and cooldown durations, voice guidance for intervals, and integrates with Apple Watch for heart rate and calorie tracking.
This app guides you through a structured interval workout, calculating your target heart rate zones and providing real-time coaching. It features a simple warm-up, four intense 4-minute intervals with recovery periods, and a cool-down, all managed by an integrated timer. Track your progress and sync data with Apple Health.
