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DevToolBox
Developer tools that make zero network calls. Verifiable.
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.
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!
About DevToolBox on Product Hunt
“Developer tools that make zero network calls. Verifiable.”
DevToolBox was submitted on Product Hunt and earned 0 upvotes and 2 comments, placing #113 on the daily leaderboard. 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.
On the analytics side, DevToolBox competes within Developer Tools and Development — topics that collectively have 521.9k followers on Product Hunt. The dashboard above tracks how DevToolBox performed against the three products that launched closest to it on the same day.
Who hunted DevToolBox?
DevToolBox was hunted by SRINIVAS ESLAWATH. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of DevToolBox including community comment highlights and product details, visit the product overview.
SRINIVAS ESLAWATH