209+ iOS apps curated and reviewed
The best timer 555 calculator apps on iPhone average 4.6★ across 209+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 3.9★ (8) | No | Yes | May 2026 |
| 2 |  | $0.99 | 4.7★ (3) | No | No | May 2026 |
| 3 |  | $1.99 | 4.8★ (1.1K) | No | Yes | Jul 2026 |
| 4 |  | Free | 4.7★ (23K) | No | Yes | Jul 2026 |
| 5 |  | Free | 4.6★ (2.9K) | Yes | No | Jul 2026 |
| 6 |  | Free | 4.8★ (3.6K) | No | No | Jul 2026 |
| 7 |  | Free | 4.6★ (4.8K) | Yes | No | Jul 2026 |
| 8 |  | Free | 4.8★ (85K) | No | Yes | Jul 2026 |
Calculate monostable and astable circuits for electronics projects. Determine pulse width and frequency, find component combinations, and save/upload data. Supports multiple languages.
Calculate parameters for monostable and astable circuits. Find component combinations for desired pulse width or frequency. Share circuit files via iCloud Drive or AirDrop.
This app offers a calculator with an editable, line-by-line tape history, combining spreadsheet-like functionality with calculator simplicity. Easily correct mistakes, add comments, and share or print your calculations.
This free calculator app offers a fast, ad-free experience with a visual input and calculation history. Customize your experience with various keyboard sounds and colors, and access advanced scientific functions when needed.
Easily calculate the difference between two times or add/subtract durations. This utility app helps manage time calculations for various purposes.
This app offers a versatile calculator with three distinct modes: Basic, Scientific, and Programmer. It provides a history view, sharing capabilities, and supports various input and output formats. The app is designed for iPhone, iPad, and iPod Touch.
This app offers a comprehensive suite of over 40 calculators and unit converters for various needs, including finance, health, construction, and everyday math. It features standard, scientific, and specialized calculators for tasks like loan amortization, currency conversion, and material estimation.
Create custom workout timers with adjustable intervals for exercise and rest. Track your progress with detailed history and statistics, and repeat past workouts easily. Enjoy audio cues without interrupting your music.
This app helps you manage workout intervals with customizable work and rest periods. It runs in the background and allows music playback, with options to save settings and share progress. Integrates with Apple Health for heart rate monitoring.
This versatile timer app offers a simple yet powerful way to manage timed activities. Customize multiple intervals with individual colors and sounds, and save them as presets for quick access. It's designed for ease of use and visibility, even from a distance, and works seamlessly in the background.
This app offers a visually engaging and intuitive timer experience, inspired by simple egg timers. It features a unique overshoot function, a game-like interface with 3D animations, and customizable skins. Widgets provide quick access to timers for daily routines.
This app provides a straightforward calculator experience with a comprehensive history log of all your computations. Customize the keyboard, display, and history records to suit your needs. Easily add annotations and titles to past calculations for better organization.
This free scientific calculator offers essential features like RPN mode, unit conversions, and multiple undo/redo. It provides a taste of a more powerful version, with optional in-app purchases for expanded functionality.
A straightforward calculator app designed for simplicity, offering basic arithmetic operations and percentage calculations. It allows users to record and recall past results, customize colors, and enable touch sounds for a personalized experience.
Manage multiple countdowns and count-ups simultaneously with customizable timers for any task. Organize your time with flexible layouts, personalized alerts, and easy sharing options. Optimize productivity for work, study, or daily activities.
This advanced timer allows for precise time management across various activities. Set multiple special events with customizable triggers like sounds, messages, or screen flashing. It's ideal for games, workouts, cooking, meditation, and any task requiring accurate timing, even when the app is in the background.
A powerful calculator designed for professionals and students, offering advanced features like RPN mode, multi-line display, and extensive unit conversions. It supports various number systems and includes an Apple Watch app for on-the-go calculations.
A large-display countdown timer for monitoring presentations or performances. It visually indicates time overruns by turning red and counting up, without audible alarms. Easily set for durations between 1 and 99 minutes.
Manage multiple timers and stopwatches simultaneously for various activities like cooking, workouts, and daily routines. Build complex interval timers with custom segments and receive voice announcements. Save and reuse timer templates for efficient time management.