# Millisecond stopwatch & timer vs Atto

The clearest difference is review sentiment: Atto at 100% against Millisecond stopwatch & timer's 50%. Atto also leads on update cadence (every 4 days vs every 4 months). Millisecond stopwatch & timer's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Atto sells 1 one-off in-app purchase. Millisecond stopwatch & timer asks for nothing beyond the download.

Millisecond stopwatch & timer ships an update every 4 months, Atto every 4 days. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Millisecond stopwatch & timer | Atto |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/millisecond-stopwatch-and-timer/id6744745649/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 38 MB | 11 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Seulki Eom](https://appshunter.io/developer/1718927408) | [Beomjin In](https://appshunter.io/developer/1791890813) |

## What reviewers say

### Millisecond stopwatch & timer

[App page](https://appshunter.io/ios/app/millisecond-stopwatch-and-timer/id6744745649)

This utility app offers both a stopwatch and a timer with millisecond precision. It includes smart presets, lap tracking, and customizable alerts. Ideal for precise timing in sports, studies, or experiments.

**Highlights:** Stopwatch and timer functionality, Millisecond visualization, Smart timer presets, Lap/split tracking, Dark mode, Vibration/sound alerts

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

**In-app purchases:** none


### Atto

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

This utility app precisely measures and displays server clock times for time-sensitive events like ticket drops. It offers advanced features to correct for device drift and ensure accurate countdowns, even while using other applications.

**Highlights:** Server clock synchronization, Millisecond precision countdown, Device drift correction, Picture-in-Picture mode, Haptic and sound alerts, Practice mode for timing, Supports over 300 time sources

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atto Pro | $1.99 | one-time |


## Frequently asked questions

### Is Millisecond stopwatch & timer free?

Millisecond stopwatch & timer is free to download, with no in-app purchases.

### Is Atto free?

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

### Do Millisecond stopwatch & timer or Atto have ads?

Both Millisecond stopwatch & timer and Atto show ads.

### Which is updated more often, Millisecond stopwatch & timer or Atto?

Millisecond stopwatch & timer ships an update every 4 months, and Atto every 4 days. Most recently, Millisecond stopwatch & timer was updated on October 30, 2026 and Atto on November 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.*