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UToolios
Free calculators & dev tools that never see your data
UToolios is 16 free tools that run entirely in your browser — nothing you type is uploaded, and there's no sign-up. Finance: mortgage (with amortization), compound interest, loans. Health: BMI, body fat, TDEE. Home: paint & primer, tiles. Developer: JWT decoder, JSON formatter & diff, Base64. Text: word counter, case converter, slugs, text diff. Each tool shows its formula and limits, and calculators can be embedded free on any site.
Hi Product Hunt 👋
I'm Sujit, and I built UToolios as a solo project. The idea is simple: most "free online calculator" and dev-tool sites either want an account, bury the tool under pop-ups, or quietly send what you type to their server. I wanted the opposite — tools that just work, instantly, and keep your data on your device.
Everything runs in your browser. Your mortgage numbers, your weight, the JWT you paste — none of it is uploaded. You can open DevTools → Network and check.
A few things I cared about:
• Real answers, not just a number — every tool explains its formula and where it breaks down (e.g. why BMI misreads athletes).
• Units people actually use — the BMI calculator does kg + feet/inches, because that's what most people outside the US search for.
• Tested — every tool ships with automated correctness tests.
• Embeddable — bloggers can drop any calculator into their own site for free.
I wanted every tool that we search online to come to one place.
It's early: 16 tools today, with more on the way. What tool should I build next? I read every comment.
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About UToolios on Product Hunt
“Free calculators & dev tools that never see your data”
UToolios was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #111 on the daily leaderboard. UToolios is 16 free tools that run entirely in your browser — nothing you type is uploaded, and there's no sign-up. Finance: mortgage (with amortization), compound interest, loans. Health: BMI, body fat, TDEE. Home: paint & primer, tiles. Developer: JWT decoder, JSON formatter & diff, Base64. Text: word counter, case converter, slugs, text diff. Each tool shows its formula and limits, and calculators can be embedded free on any site.
UToolios was featured in Productivity (661.9k followers), Privacy (11.4k followers) and Developer Tools (520.4k followers) on Product Hunt. Together, these topics include over 259.8k products, making this a competitive space to launch in.
Who hunted UToolios?
UToolios was hunted by sujit maharjan. 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.
Want to see how UToolios stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
sujit maharjan