CurlyJSON vs eryx
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
CurlyJSON compared with eryx
| Detail | 
CurlyJSON | 
eryx |
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| What it does | JSON Formatter & Validator — Free, Private & Offline
| WebAssembly sandbox for running untrusted Python safely
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| Stage | Not given
| Not given
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| Founded | Not given
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| Based in | Not given
| Not given
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| Pricing model | Freemium
| Open source
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| Pricing | Free for all tools. Pro: $29.99 per year or $4 per month, plus tax.
| Not given
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| Key features | - Validate JSON with precise line and column errors
- Repair invalid JSON fixing trailing commas, quotes, and comments
- Preserve large integers without rounding
- Detect and mask API keys, tokens and passwords
| - Full CPython 3.14 with standard library
- Async callbacks from sandboxed code
- No filesystem or network unless allowed
- Fast startup in 1–5 milliseconds
- Embed from Python, JavaScript or Rust
- MCP server support
- gRPC server deployment
- Hosted execution over HTTP and WebSocket
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| What makes it different | - Keeps large numbers exactly as written instead of silently rounding them like most online formatters
- All free tools run entirely in your browser, working offline without uploading data
- Automatically detects and warns about secrets like API keys and passwords
| - Full CPython 3.14 running in WebAssembly
- Async callbacks between sandbox and host
- Extremely fast sandbox startup
- Works as MCP server for AI agents
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| Free plan | Not given
| Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 7 | 0 |
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| Citation Flow (Majestic) | 13 | 6 |
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| Referring domains (Majestic) | 2 | 2 |
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4 details filled in for both companies.
More alternatives to CurlyJSON More alternatives to eryx