250+ iOS apps curated and reviewed
Finding the right bottoms up calcs apps can be overwhelming with so many options. We've analyzed 250+ 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 |  | $0.99 | 2.0★ (3) | No | No | Aug 2026 | |
| 2 |  | Free | 4.6★ (4.7K) | Yes | Yes | Sep 2026 | |
| 3 |  | Free | — | No | No | May 2026 | |
| 4 |  | Free | 5.0★ (2) | No | No | Jul 2026 | |
| 5 |  | $0.99 | 3.0★ (1) | No | No | Sep 2026 | |
| 6 |  | Free | 5.0★ (4) | No | No | May 2026 | |
| 7 |  | Free | — | No | No | Sep 2026 | |
| 8 |  | $1.99 | — | No | No | May 2026 |
This utility app helps oil and gas professionals quickly calculate theoretical strokes for downhole operations. It assists in spotting pills and clearing pipes by providing surface-to-bit and surface-to-surface stroke calculations. Designed for ease of use, it's an essential tool for anyone working with downhole volumes.
This app offers a comprehensive suite of 10 powerful calculators and 10 financial worksheets, designed to handle everything from basic arithmetic to complex scientific and financial calculations. It includes features like unit conversion, currency exchange, graphing, and statistical analysis, making it a versatile tool for students and professionals.
