# Atomic Exact Time vs Simple Clock JP

The clearest difference is in-app purchases: Simple Clock JP at none against Atomic Exact Time's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Atomic Exact Time sells 1 in-app purchase, starting at $2.99 per month. Simple Clock JP asks for nothing beyond the download.

Atomic Exact Time ships an update every 6 weeks, Simple Clock JP every 4 weeks. The most recent releases landed on October 14, 2026 and October 4, 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-clock/id6797418012/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 46 MB | 0 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | **iPhone, iPad, Mac** | 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-clock/id6797418012)

This app precisely calibrates your device's clock against internet time sources, accounting for network delays. It offers a full-screen display with millisecond accuracy, detailed reports on clock deviation, and a precision alarm. Ideal for professionals and enthusiasts requiring exact timing.

**Highlights:** Millisecond accurate clock display, Device offset status, Network latency and drift reports, Precision alarm, Timecode and markers, Widgets, Multiple clock themes

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atomic Exact Time Pro | $2.99 | per month |


### 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?

Neither Atomic Exact Time nor Simple Clock JP shows ads.

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

Atomic Exact Time ships an update every 6 weeks, and Simple Clock JP every 4 weeks. Most recently, Atomic Exact Time was updated on October 14, 2026 and Simple Clock JP on October 4, 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.*