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





247+ iOS apps curated and reviewed
Finding the right timer 555 calculator pro apps can be overwhelming with so many options. We've analyzed 247+ 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 | Oct 2026 | ||
| 2 | Free | 3.9★ (8) | No | Yes | Nov 2026 | ||
| 3 | Free | 4.9★ (410K) | Yes | No | Nov 2026 | ||
| 4 | Free | 4.0★ (3) | Yes | No | Oct 2026 | ||
| 5 | Free | 4.5★ (126K) | Yes | Yes | Nov 2026 | ||
| 6 | Free | 4.4★ (1.2K) | Yes | No | Nov 2026 | ||
| 7 | Free | 3.5★ (2) | Yes | No | Nov 2026 | ||
| 8 | Free | 4.7★ (103) | Yes | No | Oct 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 utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.