# Structly vs HTML Web Preview

The clearest difference is in-app purchases: HTML Web Preview at none against Structly's 3. HTML Web Preview also leads on update cadence (weekly vs every 2 weeks). Structly's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Structly sells 3 one-off in-app purchases. HTML Web Preview asks for nothing beyond the download.

Structly ships an update every 2 weeks, HTML Web Preview weekly. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Structly | HTML Web Preview |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/structly-json-formatter/id6753774575/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 8 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chen He](https://appshunter.io/developer/1843281784) | [Do Yun Kim](https://appshunter.io/developer/6811644863) |

## What reviewers say

### Structly

[App page](https://appshunter.io/ios/app/structly-json-formatter/id6753774575)

This app provides a native JSON viewer for iPhone, iPad, and Mac, with a clear tree structure, syntax coloring, and table view for easy data analysis. It also integrates directly into Safari for on-the-fly formatting and export.

**Highlights:** Native JSON viewer with syntax coloring, Table view for sortable data, Search keys and values, Inspector for dates, URLs, and Base64, Customizable export options, Safari integration for JSON pages, Share sheet integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |


### HTML Web Preview

[App page](https://appshunter.io/ios/app/html-web-preview-js-css-json/id6811644861)

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

**In-app purchases:** none


## Frequently asked questions

### Is Structly free?

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

### Is HTML Web Preview free?

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

### Do Structly or HTML Web Preview have ads?

HTML Web Preview shows ads; Structly does not.

### Which is updated more often, Structly or HTML Web Preview?

Structly ships an update every 2 weeks, and HTML Web Preview weekly. Most recently, Structly was updated on November 9, 2026 and HTML Web Preview on November 6, 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.*