249+ iOS apps curated and reviewed
The best cylinder duration apps on iPhone average 4.3★ across 249+ 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 | 4.6★ (11) | No | No | Oct 2026 | |
| 2 |  | $2.99 | 1.0★ (1) | No | No | May 2026 | |
| 3 |  | Free | — | No | No | May 2026 | |
| 4 |  | Free | — | No | No | May 2026 | |
| 5 |  | $0.99 | 4.8★ (165) | No | No | Oct 2026 | |
| 6 |  | Free | — | No | No | May 2026 | |
| 7 |  | Free | — | No | Yes | May 2026 | |
| 8 |  | Free | — | No | No | May 2026 |
Calculates remaining oxygen in a cylinder for ambulatory users. Input device, liter flow, and cylinder size for precise remaining hours and minutes. Provides peace of mind for oxygen users on the go.
Calculate the approximate remaining oxygen in portable cylinders. Select your tank size, input current pressure and desired flow rate to see duration in minutes. Features a timer with alerts for low pressure.
