# CHALLNA vs MilliS

The clearest difference is in-app purchases: CHALLNA at none against MilliS's 1. CHALLNA also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. MilliS sells 1 one-off in-app purchase. CHALLNA asks for nothing beyond the download.

## The numbers

| Metric | CHALLNA | MilliS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | — |
| Monetization | Free | — |
| Size | 38 MB | 7 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [RYNYUL](https://appshunter.io/developer/580531175) | [Jonghyeok Lim](https://appshunter.io/developer/6788035432) |

## What reviewers say

### 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


### MilliS

[App page](https://appshunter.io/ios/app/millis/id6788035100)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

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


## Frequently asked questions

### Is CHALLNA free?

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

### Is MilliS free?

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

### Do CHALLNA or MilliS have ads?

MilliS shows ads; CHALLNA does not.

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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.*