# uqudo Preview vs JSON格式化

The clearest difference is price: uqudo Preview at Free against JSON格式化's $0.99. JSON格式化's advantage is update cadence (every 2 days vs every 6 weeks) and device support (4 vs 2). On ads, in-app purchases and iOS requirement there is nothing between them.

uqudo Preview is free to download; JSON格式化 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

uqudo Preview ships an update every 6 weeks, JSON格式化 every 2 days. The most recent releases landed on September 21, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | uqudo Preview | JSON格式化 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Size | 60 MB | 1 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [uqudo](https://appshunter.io/developer/1460549939) | [珍珍 张](https://appshunter.io/developer/1607946529) |

## What reviewers say

### uqudo Preview

[App page](https://appshunter.io/ios/app/uqudo-preview/id1548639647)

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

**In-app purchases:** none


### JSON格式化

[App page](https://appshunter.io/ios/app/json/id6450169970)

**Features:** Safari Extension, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is uqudo Preview free?

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

### Is JSON格式化 free?

JSON格式化 costs $0.99, with no in-app purchases.

### Do uqudo Preview or JSON格式化 have ads?

Neither uqudo Preview nor JSON格式化 shows ads.

### Which is updated more often, uqudo Preview or JSON格式化?

uqudo Preview ships an update every 6 weeks, and JSON格式化 every 2 days. Most recently, uqudo Preview was updated on September 21, 2026 and JSON格式化 on September 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.*