# Prime Time NTP vs Atomic Exact Time

The clearest difference is ads: Prime Time NTP at none against Atomic Exact Time's shown. Atomic Exact Time's advantage is device support (4 vs 2) and iOS requirement (16.4 vs 26.0). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Prime Time NTP sells 1 one-off in-app purchase and Atomic Exact Time sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.0 for Prime Time NTP against 4.0 for Atomic Exact Time. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Prime Time NTP ships an update every 6 weeks, Atomic Exact Time every 5 weeks. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Prime Time NTP | Atomic Exact Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/prime-time-ntp/id6759555624/reviews) | [4.0 (1 ratings)](https://appshunter.io/ios/app/atomic-exact-time/id6797418012/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 11 MB | 56 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Kentaro Saito](https://appshunter.io/developer/1879482946) | [SUPER KIM KIMYA VE TEKSTIL SANAYI TICARET LIMITED SIRKETI](https://appshunter.io/developer/1896542696) |

## What reviewers say

### Prime Time NTP

[App page](https://appshunter.io/ios/app/prime-time-ntp/id6759555624)

This utility app displays the precise current time, accurate to the millisecond, by querying multiple NTP servers. It offers detailed insights into clock synchronization and network performance, with advanced features available via a one-time purchase.

**Highlights:** Millisecond time display, Queries multiple NTP servers, Detailed sync accuracy, Network performance metrics, Adaptive polling, One-time Pro upgrade

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Features | $4.99 | one-time |


### Atomic Exact Time

[App page](https://appshunter.io/ios/app/atomic-exact-time/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 (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 Prime Time NTP free?

Prime Time NTP is free to download, with in-app purchases available.

### Is Atomic Exact Time free?

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

### Which has better reviews, Prime Time NTP or Atomic Exact Time?

Prime Time NTP and Atomic Exact Time are both rated 4.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Prime Time NTP or Atomic Exact Time have ads?

Atomic Exact Time shows ads; Prime Time NTP does not.

### Which is updated more often, Prime Time NTP or Atomic Exact Time?

Prime Time NTP ships an update every 6 weeks, and Atomic Exact Time every 5 weeks. Most recently, Prime Time NTP was updated on November 5, 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.*