# Millisecond stopwatch & timer vs CHALLNA

The clearest difference is review sentiment: CHALLNA at 100% against Millisecond stopwatch & timer's 50%. CHALLNA also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 4 months). On price, in-app purchases, device support and iOS requirement 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, CHALLNA every 2 weeks. The most recent releases landed on September 25, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | Millisecond stopwatch & timer | CHALLNA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/millisecond-stopwatch-and-timer/id6744745649/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 38 MB | 38 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Seulki Eom](https://appshunter.io/developer/1718927408) | [RYNYUL](https://appshunter.io/developer/580531175) |

## 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


### CHALLNA

[App page](https://appshunter.io/ios/app/challna-precise-server-clock/id6759583731)

This app helps you achieve precise timing for critical online events by displaying accurate server time, accounting for network latency. It offers one-touch presets for popular sites, countdown timers, and practice modes to improve your reaction speed for ticket sales, course registrations, and limited drops.

**Highlights:** Millisecond precision synchronization, One-touch server presets, Intuitive countdown timers, Click practice mode, Smart reminders and schedule registration, Direct site access, Dynamic Island support

**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 CHALLNA free?

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

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

Millisecond stopwatch & timer shows ads; CHALLNA does not.

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

Millisecond stopwatch & timer ships an update every 4 months, and CHALLNA every 2 weeks. Most recently, Millisecond stopwatch & timer was updated on September 25, 2026 and CHALLNA on August 24, 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.*