# Millisecond stopwatch & timer vs Redo Calculator

The clearest difference is ads: Redo Calculator at none against Millisecond stopwatch & timer's shown. Redo Calculator also leads on update cadence (every 2 months vs every 4 months) and iOS requirement (13.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Millisecond stopwatch & timer ships an update every 4 months, Redo Calculator every 2 months. The most recent releases landed on October 21, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Millisecond stopwatch & timer | Redo Calculator |
| --- | --- | --- |
| 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 | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Ad-supported | — |
| Size | 38 MB | 20 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seulki Eom](https://appshunter.io/developer/1718927408) | [Seongmin Yim](https://appshunter.io/developer/1529542974) |

## 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


### Redo Calculator

[App page](https://appshunter.io/ios/app/redo-calculator/id6753993375)

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

**In-app purchases:** none


## Frequently asked questions

### Is Millisecond stopwatch & timer free?

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

### Is Redo Calculator free?

Redo Calculator is free to download, with no in-app purchases.

### Do Millisecond stopwatch & timer or Redo Calculator have ads?

Millisecond stopwatch & timer shows ads; Redo Calculator does not.

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

Millisecond stopwatch & timer ships an update every 4 months, and Redo Calculator every 2 months. Most recently, Millisecond stopwatch & timer was updated on October 21, 2026 and Redo Calculator on October 7, 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.*