# CHALLNA vs Nanotime

The clearest difference is review sentiment: CHALLNA at 100% against Nanotime's 50%. CHALLNA also leads on in-app purchases (none vs 1) and ads (none vs shown). Nanotime's advantage is update cadence (every 2 days vs every 2 weeks). On price, device support and iOS requirement there is nothing between them.

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

CHALLNA ships an update every 2 weeks, Nanotime every 2 days. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CHALLNA | Nanotime |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | **Free** | Ad-supported |
| Size | 38 MB | 66 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


### Nanotime

[App page](https://appshunter.io/ios/app/nanotime-server-time-clock/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 (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is CHALLNA free?

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

### Is Nanotime free?

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

### Do CHALLNA or Nanotime have ads?

Nanotime shows ads; CHALLNA does not.

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

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