16+ iOS apps curated and reviewed
Every iPhone needs a few good saybolt viscosity apps. We benchmark 16+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 3.0★ (2) | No | No | May 2026 | |
| 2 |  | $2.99 | — | No | No | May 2026 | |
| 3 |  | Free | 5.0★ (6) | No | No | May 2026 | |
| 4 |  | Free | 5.0★ (3) | No | No | May 2026 | |
| 5 |  | Free | — | No | No | May 2026 | |
| 6 |  | Free | — | No | No | May 2026 | |
| 7 |  | Free | — | No | No | May 2026 | |
| 8 |  | Free | — | No | No | May 2026 |
This application serves as a calculator for converting viscosity and temperature values for petroleum fuels. It allows users to convert Kinematic Viscosity in Centistokes to desired target values across different temperature scales. In landscape mode, it transforms into a slider for visual comparison of viscosity units.
Calculate kinematic viscosity or drain time for various viscosity cups. Input a known value and cup type to find the unknown, with visual indicators for valid measurement ranges. Helps select the appropriate cup for accurate testing.
