# SignalClock Lite vs Atomic Exact Time

The clearest difference is in-app purchases: SignalClock Lite at none against Atomic Exact Time's 3. SignalClock Lite also leads on ads (none vs shown) and iOS requirement (12.0 vs 16.4). Atomic Exact Time's advantage is update cadence (every 5 weeks vs every 7 months). On price and device support there is nothing between them.

Both are free to download. Atomic Exact Time sells 3 in-app purchases, starting at $2.99 per month. SignalClock Lite asks for nothing beyond the download.

SignalClock Lite ships an update every 7 months, Atomic Exact Time every 5 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | SignalClock Lite | Atomic Exact Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/atomic-exact-time/id6797418012/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 28 MB | 56 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Masafumi Endoh](https://appshunter.io/developer/757354996) | [SUPER KIM KIMYA VE TEKSTIL SANAYI TICARET LIMITED SIRKETI](https://appshunter.io/developer/1896542696) |

## What reviewers say

### SignalClock Lite

[App page](https://appshunter.io/ios/app/signalclock-lite/id908918011)

This utility app displays a digital clock with a time signal function using local notifications. It offers multiple sound sets and font options. The free version has limitations on scheduling time signals to half-hour intervals.

**Highlights:** Local notification time signals, Multiple sound sets, iOS 10 font support, Half-hour signal scheduling (free edition), Digital clock display

**Features:** macOS Compatibility

**In-app purchases:** none


### Atomic Exact Time

[App page](https://appshunter.io/ios/app/atomic-exact-time/id6797418012)

Synchronize your device's clock with network time sources, view its offset, and use a corrected display. Features include countdown timers, team targets, and world clocks. Optional Pro plans offer advanced features and ad removal.

**Highlights:** Network time synchronization, Offset and uncertainty measurement, Corrected clock display, Countdown timers, Team countdown sharing, World clocks, Home-screen widget

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atomic Exact Time Pro | $2.99 | per month |
| Pro Yearly | $19.99 | per year |
| Atomic Exact Time Pro | $2.99 | one-time |


## Frequently asked questions

### Is SignalClock Lite free?

SignalClock Lite is free to download, with no in-app purchases.

### Is Atomic Exact Time free?

Atomic Exact Time is free to download, with in-app purchases available.

### Do SignalClock Lite or Atomic Exact Time have ads?

Atomic Exact Time shows ads; SignalClock Lite does not.

### Which is updated more often, SignalClock Lite or Atomic Exact Time?

SignalClock Lite ships an update every 7 months, and Atomic Exact Time every 5 weeks. Most recently, SignalClock Lite was updated on November 1, 2026 and Atomic Exact Time on November 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*