Structly vs HTML Web Preview
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Structly
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.
- 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
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Structly makes JSON easy to read, in its own native viewer on iPhone, iPad and Mac, and right inside Safari. A NATIVE JSON VIEWER • Open files, paste text, or pick up where you left off with recent documents • A clear tree with syntax colors, item counts and indentation guides • Table view turns lists of objects, such as API results, into sortable columns • Source view with syntax highlighting • Numbers keep their exact spelling, even huge integers and precise decimals FIND AND UNDERSTAND • Search keys and values with highlighted matches, or show only the matches • Jump straight to a path such as $.users[0].name • The inspector shows readable dates for Unix timestamps and ISO 8601 dates, decodes URL and Base64 strings, and opens links • Copy a value, key or JSON path with one tap EXPORT YOUR WAY • 2 or 4 spaces, tabs or minified, with optional sorted keys • Save to Files or copy to the clipboard IN SAFARI • Formats JSON pages automatically, with search, JSON Path queries and themes • Export to JSON, YAML or CSV • Send any JSON page to the Structly app with one tap SHARE SHEET • "View in Structly" opens JSON from Files, Mail and other apps right in the share sheet PRIVATE BY DESIGN No account, ads or tracking. JSON documents stay on your device. Apple and RevenueCat process optional tips and anonymous purchase history. Built for developers, API testers and anyone who works with JSON.
HTML Web Preview
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Open your web projects on iPhone and iPad. HTML Web Preview opens a folder of HTML and its related files, with JSON and source available alongside the page. Explore your own study materials, web documents, small tools and prototypes on your device. • Open a project folder: keep HTML, CSS, JavaScript, images and JSON together with their file structure intact. • Keep your originals: the app does not modify selected files or folders. Switch between formatted JSON and original text, and refresh after editing files in another app. • Preview before running: folders open with page JavaScript disabled. Review the contents and run only projects you trust. A separately confirmed compatibility mode is available for some web features. • Adjust the view: collapse the controls, use the current device screen, or select a fixed or custom resolution. Zoom the page as in a browser to adjust text and element sizes, line wrapping and layout. Resolution settings do not reproduce every feature of a device. • Inspect errors: distinguish missing files from page errors and check the project activity log. Before you begin Projects can work offline when all required files are stored on your device and no external services are needed. Cloud downloads, external web resources and ads may require internet access. ZIP extraction, file editing, server-side programs such as Python, PHP or Node.js, project builds and download management are not supported. Open the finished web output folder for projects that need a build step. Page inputs and runtime state are not permanently saved and may reset when a project closes or restarts. Read-only access does not block every form of external communication. Run only trusted projects without sensitive files. The version 1.3 interface supports 15 languages: Korean, English, Japanese, Simplified and Traditional Chinese, German, French, Spanish, Brazilian Portuguese, Arabic, Uzbek, Vietnamese, Thai, Hebrew and Serbian (Latin script). Your documents and code remain in their original language.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Structly | HTML Web Preview |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 85.7% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 weeks | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Chen He | Do Yun Kim |
In-app purchases
Structly
- Small Tip$0.99
- Medium Tip$2.99
- Large Tip$4.99
HTML Web Preview
No in-app purchases
Questions
Is Structly free?
Is HTML Web Preview free?
Do Structly or HTML Web Preview have ads?
Which is updated more often, Structly or HTML Web Preview?
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