# Atomic Clock vs 時計 PiP

The clearest difference is update cadence: 時計 PiP at every 4 days against Atomic Clock's every 6 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Atomic Clock sells 2 in-app purchases, starting at $5.99 per month and 時計 PiP sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Atomic Clock ships an update every 6 weeks, 時計 PiP every 4 days. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Atomic Clock | 時計 PiP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/atomic-clock-precision-time/id6760377377/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 2 MB |
| Requires iOS | **17.6** | 18 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [家宝 戴](https://appshunter.io/developer/1826395838) | [Takehiro Iimure](https://appshunter.io/developer/1895470812) |

## What reviewers say

### Atomic Clock

[App page](https://appshunter.io/ios/app/atomic-clock-precision-time/id6760377377)

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.

**Highlights:** NTP-based time synchronization, Millisecond time detail, Local time and UTC display, Device offset and network latency indicators, Automatic sync, Multiple clock styles, Customizable colors and night mode

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AtomicClock Pro Monthly | $5.99 | per month |
| AtomicClock Pro Monthly | $19.99 | per year |


### 時計 PiP

[App page](https://appshunter.io/ios/app/pip/id6763744874)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| コーヒー1杯 | $0.49 | one-time |
| ケーキ1つ | $1.99 | one-time |


## Frequently asked questions

### Is Atomic Clock free?

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

### Is 時計 PiP free?

時計 PiP is free to download, with in-app purchases available.

### Do Atomic Clock or 時計 PiP have ads?

Neither Atomic Clock nor 時計 PiP shows ads.

### Which is updated more often, Atomic Clock or 時計 PiP?

Atomic Clock ships an update every 6 weeks, and 時計 PiP every 4 days. Most recently, Atomic Clock was updated on October 6, 2026 and 時計 PiP on October 8, 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.*