# MillisecondTimer vs CHALLNA

The clearest difference is in-app purchases: CHALLNA at none against MillisecondTimer's 3. CHALLNA also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. MillisecondTimer sells 3 in-app purchases, starting at $1.00 per month. CHALLNA asks for nothing beyond the download.

MillisecondTimer ships an update every 3 weeks, CHALLNA every 2 weeks. The most recent releases landed on October 2, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | MillisecondTimer | CHALLNA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/millisecondtimer/id6462732415/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 30 MB | 38 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WONJI HA](https://appshunter.io/developer/1703308182) | [RYNYUL](https://appshunter.io/developer/580531175) |

## 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 |


### 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 MillisecondTimer free?

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

### Is CHALLNA free?

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

### Do MillisecondTimer or CHALLNA have ads?

MillisecondTimer shows ads; CHALLNA does not.

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

MillisecondTimer ships an update every 3 weeks, and CHALLNA every 2 weeks. Most recently, MillisecondTimer was updated on October 2, 2026 and CHALLNA on October 12, 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.*