DevToolBox
Developer tools that make zero network calls. Verifiable.
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DevToolBox - Developer tools that make zero network calls. Verifiable.

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Most online developer tools have a dirty secret: they send your pasted data to servers. Analytics endpoints, "improvement" APIs, or just... somewhere. DevToolBox is different. Every tool runs 100% in your browser. Not "we promise" — verifiably. Open your Network tab while using any tool. Nothing fires.

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Maker here! The origin story: I caught a popular JSON formatter POSTing my pasted content to a third-party analytics endpoint. After that, I decided to build my own tools where I could *verify* that data stays local. The architecture is simple: pure JavaScript for all computations, no backend, no API calls. The hosting is static files on a CDN. Even if I wanted to steal your data, the code literally has no mechanism to send it anywhere. **7 tools at launch:** • JSON Formatter & Validator • Regex Tester (real-time highlighting) • Base64 Encoder/Decoder (UTF-8 aware) • JWT Decoder (expiry checker) • Hash Generator (MD5 → SHA-512) • URL Encoder/Decoder • Color Converter (HEX/RGB/HSL) **Why it's different:** • Zero network calls (verify in DevTools) • Installable as a PWA (works offline) • No signup, no account, no tracking • Sub-90KB per page load • $0/month to run Next up: Cron Expression Builder, Timestamp Converter, and a JSON Diff tool. Voting on what comes first in the comments!

How does this hold up for the heavier tools like JSON-to-cSV converters with massive datasets, or does performance start to dip once you get past a few MB?

The verifiable part is what sold me—actually opening the Network tab and seeing zero requests is such a clean way to earn trust instead of just asking for it.

The "open your Network tab" proof is such a simple move and it does more for trust than any marketing copy could. Love seeing tools that respect the developer using them.