# Countdown vs Atomic Exact Time

The clearest difference is in-app purchases: Countdown at none against Atomic Exact Time's 1. Atomic Exact Time's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

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

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on October 8, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Countdown | Atomic Exact Time |
| --- | --- | --- |
| 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 | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 46 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [Antoine Coilliaux](https://appshunter.io/developer/1896745863) | [SUPER KIM KIMYA VE TEKSTIL SANAYI TICARET LIMITED SIRKETI](https://appshunter.io/developer/1896542696) |

## What reviewers say

### Countdown

[App page](https://appshunter.io/ios/app/countdown-event-tracker/id6770473599)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Countdown free?

Countdown 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 Countdown or Atomic Exact Time have ads?

Neither Countdown nor Atomic Exact Time shows ads.

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

Countdown ships an update every 6 weeks, and Atomic Exact Time every 6 weeks. Most recently, Countdown was updated on October 8, 2026 and Atomic Exact Time on October 14, 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.*