# Second vs Jangsoo

The clearest difference is in-app purchases: Jangsoo at none against Second's 1. Jangsoo also leads on ads (none vs shown). Second's advantage is update cadence (every 3 days vs every 11 days) and iOS requirement (15.0 vs 17.0). On price and device support there is nothing between them.

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

Second ships an update every 3 days, Jangsoo every 11 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Second | Jangsoo |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 11 days |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 31 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Minjun Kim](https://appshunter.io/developer/1841275054) | [URIEL ELECTRONICS Inc.](https://appshunter.io/developer/1145162575) |

## 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 |


### Jangsoo

[App page](https://appshunter.io/ios/app/jangsoo/id6793023166)

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

**In-app purchases:** none


## Frequently asked questions

### Is Second free?

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

### Is Jangsoo free?

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

### Do Second or Jangsoo have ads?

Second shows ads; Jangsoo does not.

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

Second ships an update every 3 days, and Jangsoo every 11 days. Most recently, Second was updated on November 6, 2026 and Jangsoo on October 31, 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.*