Calculate parameters for monostable and astable circuits. Find component combinations for desired pulse width or frequency. Share circuit files via iCloud Drive or AirDrop.
Timer 555 Calculator Pro by Siu Yuen Ho





245+ iOS apps curated and reviewed
Finding the right timer 555 calculator pro apps can be overwhelming with so many options. We've analyzed 245+ 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 | 4.7★ (3) | No | No | May 2026 | ||
| 2 | Free | 3.9★ (8) | No | Yes | Sep 2026 | ||
| 3 | Free | 4.6★ (36K) | Yes | Yes | Sep 2026 | ||
| 4 | Free | 4.0★ (3) | Yes | No | May 2026 | ||
| 5 | Free | 4.6★ (358K) | Yes | Yes | Sep 2026 | ||
| 6 | Free | 5.0★ (1) | No | Yes | May 2026 | ||
| 7 | Free | 4.4★ (1.2K) | Yes | No | Sep 2026 | ||
| 8 | Free | 4.7★ (25K) | No | Yes | Sep 2026 |





Calculate parameters for monostable and astable circuits. Find component combinations for desired pulse width or frequency. Share circuit files via iCloud Drive or AirDrop.





Calculate monostable and astable circuits for electronics projects. Determine pulse width and frequency, find component combinations, and save/upload data. Supports multiple languages.






This multi-function calculator offers basic to advanced scientific and algebraic computations. It includes features like handwriting recognition, equation solvers, and 2D graphing, making it suitable for students and professionals. In-app purchases unlock advanced capabilities.