# ゆらぎ時計 1/f vs Atto

The clearest difference is in-app purchases: ゆらぎ時計 1/f at none against Atto's 1. ゆらぎ時計 1/f also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). Atto's advantage is update cadence (every 3 days vs every 2 months). On price and ads there is nothing between them.

Both are free to download. Atto sells 1 one-off in-app purchase. ゆらぎ時計 1/f asks for nothing beyond the download.

ゆらぎ時計 1/f ships an update every 2 months, Atto every 3 days. The most recent releases landed on October 11, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | ゆらぎ時計 1/f | Atto |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 15 MB | 11 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [takayuki atsumi](https://appshunter.io/developer/1495474977) | [Beomjin In](https://appshunter.io/developer/1791890813) |

## What reviewers say

### ゆらぎ時計 1/f

[App page](https://appshunter.io/ios/app/1f-yuragi-clock/id1537216400)

**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 | $2.99 | one-time |


## Frequently asked questions

### Is ゆらぎ時計 1/f free?

ゆらぎ時計 1/f is free to download, with no in-app purchases.

### Is Atto free?

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

### Do ゆらぎ時計 1/f or Atto have ads?

Both ゆらぎ時計 1/f and Atto show ads.

### Which is updated more often, ゆらぎ時計 1/f or Atto?

ゆらぎ時計 1/f ships an update every 2 months, and Atto every 3 days. Most recently, ゆらぎ時計 1/f was updated on October 11, 2026 and Atto on October 15, 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.*