# Second vs Atto

The clearest difference is review sentiment: Atto at 100% against Second's 89%. Second's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Second sells 1 one-off in-app purchase and Atto sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Second ships an update every 3 days, Atto every 4 days. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Second | Atto |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/second-sync/id6752860014/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 88.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 4 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 69 MB | 11 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Minjun Kim](https://appshunter.io/developer/1841275054) | [Beomjin In](https://appshunter.io/developer/1791890813) |

## What reviewers say

### Second

[App page](https://appshunter.io/ios/app/second-sync/id6752860014)

This utility app provides precise server time synchronization down to milliseconds, ideal for critical moments like course registration or ticket purchases. It features drift tracking for sustained accuracy and a Picture-in-Picture timer for live monitoring while using other applications.

**Highlights:** Precise server time synchronization, Drift tracking for accuracy, Picture-in-Picture timer, Example site shortcuts, Multilingual support

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 초정확 Pro 업그레이드 | $1.99 | one-time |


### 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 Second free?

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

### Is Atto free?

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

### Do Second or Atto have ads?

Both Second and Atto show ads.

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

Second ships an update every 3 days, and Atto every 4 days. Most recently, Second was updated on November 6, 2026 and Atto on November 4, 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.*