# 秒定 vs Decidy

The clearest difference is in-app purchases: 秒定 at none against Decidy's 2. 秒定 also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.1). Decidy's advantage is update cadence (every 2 days vs every 5 months). On price and device support there is nothing between them.

Both are free to download. Decidy sells 2 one-off in-app purchases. 秒定 asks for nothing beyond the download.

秒定 ships an update every 5 months, Decidy every 2 days. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 秒定 | Decidy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 days** |
| Size | 38 MB | 57 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [昊政 李](https://appshunter.io/developer/1862645259) | [原 田](https://appshunter.io/developer/1871034186) |

## What reviewers say

### 秒定

[App page](https://appshunter.io/ios/app/id6758103716)

**In-app purchases:** none


### Decidy

[App page](https://appshunter.io/ios/app/decidy/id6758129564)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free | $0.99 | one-time |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is 秒定 free?

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

### Is Decidy free?

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

### Do 秒定 or Decidy have ads?

Decidy shows ads; 秒定 does not.

### Which is updated more often, 秒定 or Decidy?

秒定 ships an update every 5 months, and Decidy every 2 days. Most recently, 秒定 was updated on October 24, 2026 and Decidy on October 10, 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.*