# Atomic Exact Time vs Simple Clock JP

The clearest difference is in-app purchases: Simple Clock JP at none against Atomic Exact Time's 3. Simple Clock JP also leads on ads (none vs shown). Atomic Exact Time's advantage is device support (4 vs 2). On price, update cadence and iOS requirement there is nothing between them.

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

Atomic Exact Time ships an update every 5 weeks, Simple Clock JP every 4 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Atomic Exact Time | Simple Clock JP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/atomic-exact-time/id6797418012/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 0 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | **iPhone, iPad, Mac, Apple TV** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SUPER KIM KIMYA VE TEKSTIL SANAYI TICARET LIMITED SIRKETI](https://appshunter.io/developer/1896542696) | [Kantaro Kobayashi](https://appshunter.io/developer/6797092531) |

## What reviewers say

### 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 |


### Simple Clock JP

[App page](https://appshunter.io/ios/app/simple-clock-jp/id6805928074)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Atomic Exact Time free?

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

### Is Simple Clock JP free?

Simple Clock JP is free to download, with no in-app purchases.

### Do Atomic Exact Time or Simple Clock JP have ads?

Atomic Exact Time shows ads; Simple Clock JP does not.

### Which is updated more often, Atomic Exact Time or Simple Clock JP?

Atomic Exact Time ships an update every 5 weeks, and Simple Clock JP every 4 weeks. Most recently, Atomic Exact Time was updated on November 6, 2026 and Simple Clock JP on October 31, 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.*