248+ iOS apps curated and reviewed
With an average user rating of 4.7★, the atomic clock free category is one of the App Store's strongest. Browse all 248+ apps we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | May 2026 |
| 2 |  | Free | 4.8★ (5.5K) | Yes | Yes | Aug 2026 |
| 3 |  | Free | 4.7★ (10K) | Yes | Yes | Aug 2026 |
| 4 |  | $1.99 | 4.8★ (4.9K) | No | Yes | Aug 2026 |
| 5 |  | Free | 5.0★ (4) | No | Yes | May 2026 |
| 6 |  | Free | 4.5★ (1K) | Yes | Yes | Aug 2026 |
| 7 |  | Free | 4.9★ (105) | — | No | Aug 2026 |
| 8 |  | Free | 4.8★ (4) | No | Yes | Jun 2026 |
This app displays the exact current time synchronized with NTP servers, offering a customizable clock view for precise time checks. It's ideal for setting watches, verifying timestamps, or comparing local and network time.
Get the most accurate time from an official atomic clock server. This app automatically detects your time zone and allows custom backgrounds. Easily switch between digital and analog clock displays with a swipe.
This app provides ultra-precise time by syncing with atomic time servers. It features a customizable display mimicking professional studio clocks, with advanced alarm functions and various visual themes. Designed for accuracy and usability, it's ideal for professionals and enthusiasts alike.
A highly accurate and customizable digital clock that fills your screen. Offers adjustable colors, sizes, and 12/24 hour formats. Designed for minimal battery usage.
This app helps synchronize radio-controlled watches by simulating time signal waves. It supports various international time signal standards and offers a 'Beast Mode' for faster synchronization. Simply place your watch near your device's speaker and start the process.
Experience highly detailed mechanical watch faces with advanced astronomical and clock complications. Track celestial events, manage time with precision, and explore historical and future dates with interactive displays. Optimized for iPhone and iPod touch.
This utility provides highly accurate time synchronization using NTP, displaying precise time with millisecond detail. It allows comparison with network time, shows sync offset and latency, and offers various clock styles with customization options. It's designed for users needing a reliable, precise reference clock.
This app offers a clean, landscape-oriented digital clock experience for your desk or nightstand. It features elegant clock skins, ambient fullscreen effects, and useful tools like a timer and stopwatch.
This app displays a large, customizable digital clock on your entire screen. Adjust background and text colors, font, and time format. Enjoy an ad-free viewing experience while the clock is active.
This app offers a variety of clock styles including flip, digital, and analog. It features customizable alarms with music options, a world clock for multiple locations, and several user-friendly controls for brightness, touch lock, and flashlight activation.
Manage your time effectively with customizable alarms, world clock, stopwatch, and countdown timer. Wake up on time, track activities, and stay connected across time zones with this easy-to-use utility.