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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| Diffcheckerdiffchecker.com | CodePencodepen.io | Hoppscotchhoppscotch.io | JSON Crackjsoncrack.com | |
|---|---|---|---|---|
| What it does | Shows exactly what changed between two blocks of text, side by side | Write HTML, CSS and JavaScript in a tab and watch it render live | Sends HTTP, GraphQL and WebSocket requests from a browser tab | Turns a wall of JSON into a node graph you can pan and search |
| What it costs you | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. |
| Your files | Runs on their server | Runs on their server | Runs on your device | Runs on your device |
| Where it stops | File comparisons upload your documents and hit a size cap on the free tier; only the text diff stays local. | Everything saved on the free plan is public and searchable; private pens need a paid account. | Requests to APIs without CORS headers are blocked unless you install the extension or self-host the proxy. | The graph bogs down past roughly 300 KB of input, and the advanced editing features moved to a paid sibling product. |
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| Category | Developer & Code | Developer & Code | Developer & Code | Developer & Code |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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