247+ iOS apps curated and reviewed
Whether you're new to 555 calc or looking for an upgrade, our curated collection of 247+ 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 | May 2026 | |
| 2 |  | Free | 3.9★ (8) | No | Yes | Aug 2026 | |
| 3 |  | Free | 4.4★ (96) | No | No | Sep 2026 | |
| 4 |  | Free was $5.99 | 4.8★ (2.4K) | No | Yes | Sep 2026 | |
| 5 |  | Free | 3.9★ (28) | No | Yes | Aug 2026 | |
| 6 |  | Free | 4.7★ (845) | No | Yes | Sep 2026 | |
| 7 |  | Free | 3.4★ (10) | No | Yes | Sep 2026 | |
| 8 |  | Free | — | Yes | No | Sep 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.
This app provides a free, intuitive graphing calculator experience on your iPhone or iPad. It's designed to make learning math easier with features for solving equations, graphing functions, and computing statistics. The app is frequently updated with new features and is programmable in Python.
