246+ iOS apps curated and reviewed
Whether you're new to 555 calc or looking for an upgrade, our curated collection of 246+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.0★ (3) | Yes | No | Oct 2026 | |
| 2 |  | Free | 3.9★ (8) | No | Yes | Nov 2026 | |
| 3 |  | Free | 3.9★ (28) | No | Yes | Nov 2026 | |
| 4 |  | Free | 4.4★ (101) | No | No | Nov 2026 | |
| 5 |  | Free | — | No | No | Nov 2026 | |
| 6 |  | Free | — | No | Yes | Oct 2026 | |
| 7 |  | Free | 4.8★ (2.4K) | No | Yes | Nov 2026 | |
| 8 |  | $3.99 | 4.9★ (206) | Yes | No | Oct 2026 |
This utility app helps engineers and hobbyists calculate resistor values for circuits using the Timer IC 555. Simply input frequency, duty ratio, and capacitor values to get the required resistor outputs.
Calculate monostable and astable circuits for electronics projects. Determine pulse width and frequency, find component combinations, and save/upload data. Supports multiple languages.
A visually appealing and straightforward calculator app for iPhone and iPad. It offers a unique user interface with support for basic and scientific calculations, various number base conversions, and currency and unit conversions.
