# MillisecondTimer vs Atto

The clearest difference is update cadence: Atto at every 3 days against MillisecondTimer's every 3 weeks. MillisecondTimer's advantage is iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. MillisecondTimer sells 3 in-app purchases, starting at $1.00 per month and Atto sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

MillisecondTimer ships an update every 3 weeks, Atto every 3 days. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | MillisecondTimer | Atto |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/millisecondtimer/id6462732415/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 30 MB | 11 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [WONJI HA](https://appshunter.io/developer/1703308182) | [Beomjin In](https://appshunter.io/developer/1791890813) |

## What reviewers say

### MillisecondTimer

[App page](https://appshunter.io/ios/app/millisecondtimer/id6462732415)

This app provides highly accurate timing tools, including a countdown timer, stopwatch, and clock, all with millisecond precision. It's designed for precise measurements in workouts, games, and everyday situations, offering background operation and seamless switching between apps.

**Highlights:** Millisecond precision timing, Countdown timer with custom intervals, Stopwatch for accurate interval recording, Real-time millisecond clock display, Background operation and notifications, Recent timers for quick reuse, Customizable 12/24 hour clock format

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MillisecondTimer Pro Month Plan | $1.00 | per month |
| MillisecondTimer Pro Annual Plan | $5.99 | per year |
| MillisecondTimer Pro Lifetime | $34.99 | one-time |


### Atto

[App page](https://appshunter.io/ios/app/atto-ticket-drop-timer/id6811104130)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atto Pro | $2.99 | one-time |


## Frequently asked questions

### Is MillisecondTimer free?

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

### Is Atto free?

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

### Do MillisecondTimer or Atto have ads?

Both MillisecondTimer and Atto show ads.

### Which is updated more often, MillisecondTimer or Atto?

MillisecondTimer ships an update every 3 weeks, and Atto every 3 days. Most recently, MillisecondTimer was updated on October 2, 2026 and Atto on October 10, 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.*