# CHALLNA vs 나노타임

The clearest difference is review sentiment: CHALLNA at 100% against 나노타임's 50%. CHALLNA also leads on ads (none vs shown) and monetization model (free vs ad-supported). 나노타임's advantage is update cadence (every 2 days vs every 2 weeks). 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.

CHALLNA ships an update every 2 weeks, 나노타임 every 2 days. The most recent releases landed on October 12, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | CHALLNA | 나노타임 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | **Free** | Ad-supported |
| Size | 38 MB | 62 MB |
| Requires iOS | 16.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RYNYUL](https://appshunter.io/developer/580531175) | [Nemo factory](https://appshunter.io/developer/6781919423) |

## 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


### 나노타임

[App page](https://appshunter.io/ios/app/pip/id6801582008)

This app displays the precise server time of ticketing and course registration websites in milliseconds. It directly queries the target site's server, accounting for network delays and server clock discrepancies. Get accurate countdowns and alerts for important events without relying on your phone's standard clock.

**Highlights:** Millisecond-accurate server time display, Direct server queries, no central server, Accounts for network delay and server clock drift, Supports over 1,200 pre-registered sites, Custom site input and favorites, Audio and vibration alerts for target times, Picture-in-Picture (PiP) mode for concurrent browsing

**In-app purchases:** none


## Frequently asked questions

### Is CHALLNA free?

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

### Is 나노타임 free?

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

### Do CHALLNA or 나노타임 have ads?

나노타임 shows ads; CHALLNA does not.

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

CHALLNA ships an update every 2 weeks, and 나노타임 every 2 days. Most recently, CHALLNA was updated on October 12, 2026 and 나노타임 on October 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*