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usepreciso
Free browser tools - your data never leaves your device
usepreciso is a collection of free, fast, privacy-first tools. Developer tools, unit converters, text utilities, design tools, productivity apps and kids activities. Every single tool runs entirely in your browser no servers, no accounts, no ads, no data collection
Hi Product Hunt! 👋 I'm the maker of usepreciso and I want to explain why I built this instead of just using the dozens of similar tools that already exist.
Every day I paste JWTs into decoders, format JSON payloads, and run word counts on private documents. I kept asking myself: where does this data actually go? Most tools send it to a server. In 2026, some feed it into AI models.
I wanted a set of tools where that question simply doesn't arise, because nothing leaves the browser in the first place. Not because of a privacy policy (anyone can write one). Because there is no server call to make.
🔒 Why usepreciso is different:
• Everything runs in JavaScript in your browser tab
• No account required - ever
• No trackers, no analytics on what you type
• Your JWT, your JSON, your private documents stay yours
• Works offline after first load
• Free forever
In the age of AI, data privacy isn't just a feature, it's the only promise a utility tool can actually keep.
⚡ A few things I'm proud of:
• The DST tracker covers 68 countries currently observing DST, plus full historical data for 72 that stopped, including exactly when, why, and what offset they moved to
• The kids site locks to fullscreen so toddlers can't accidentally close games. The 2-second hold to exit wasn't a clever UX decision, it was survival (my daughter is 2)
• The chart generator accepts CSV, Excel and JSON, upload a spreadsheet and get a chart in seconds
This is a solo build. I'd genuinely love your feedback, especially on tools that feel half-baked, things that are missing, or anything that doesn't work the way you'd expect.
Thank you for checking it out 🙏
About usepreciso on Product Hunt
“Free browser tools - your data never leaves your device”
usepreciso was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #11 on the daily leaderboard. usepreciso is a collection of free, fast, privacy-first tools. Developer tools, unit converters, text utilities, design tools, productivity apps and kids activities. Every single tool runs entirely in your browser no servers, no accounts, no ads, no data collection
On the analytics side, usepreciso competes within Productivity, Privacy and Developer Tools — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how usepreciso performed against the three products that launched closest to it on the same day.
Who hunted usepreciso?
usepreciso was hunted by Shubham Singh. 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 usepreciso including community comment highlights and product details, visit the product overview.
Shubham Singh