# 땡초 vs Atto

The clearest difference is in-app purchases: 땡초 at none against Atto's 1. 땡초 also leads on ads (none vs shown). Atto's advantage is update cadence (every 4 days vs every 2 months). On price, device support and iOS requirement there is nothing between them.

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

땡초 ships an update every 2 months, Atto every 4 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 땡초 | Atto |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 11 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GeonWoo Shin](https://appshunter.io/developer/1853388063) | [Beomjin In](https://appshunter.io/developer/1791890813) |

## What reviewers say

### 땡초

[App page](https://appshunter.io/ios/app/id6773711146)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Atto

[App page](https://appshunter.io/ios/app/atto-ticket-drop-timer/id6811104130)

This utility app precisely measures and displays server clock times for time-sensitive events like ticket drops. It offers advanced features to correct for device drift and ensure accurate countdowns, even while using other applications.

**Highlights:** Server clock synchronization, Millisecond precision countdown, Device drift correction, Picture-in-Picture mode, Haptic and sound alerts, Practice mode for timing, Supports over 300 time sources

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

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


## Frequently asked questions

### Is 땡초 free?

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

### Is Atto free?

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

### Do 땡초 or Atto have ads?

Atto shows ads; 땡초 does not.

### Which is updated more often, 땡초 or Atto?

땡초 ships an update every 2 months, and Atto every 4 days. Most recently, 땡초 was updated on October 25, 2026 and Atto on October 29, 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.*