Every tool we've built — no signup, no download, no tracking. Runs entirely in your browser.
| Site | Tools | Cost | Signup required | Runs in browser | Data leaves device |
|---|---|---|---|---|---|
| ⚡ Tabutility | 151 | Free | Never | 100% in browser | Never |
| Calculator.net | ~200+ | Free | No | Mostly | Some |
| Omni Calculator | ~3,700 | Free / Pro | Optional | Yes | Some (save feature) |
| Tools.so | ~50 | Free / Paid plans | Some require | Partial | Some |
Tabutility's focus: privacy-first tools that run entirely in your browser. No accounts, no uploads, no tracking.
Every tool in this directory runs entirely in your browser — nothing is uploaded, no account is needed, and results appear instantly. The collection covers five countries' tax and salary calculators (UK, US, Australia, Canada and Japan), mortgages and loans, SEO and webmaster utilities, developer tools, unit converters and everyday health calculators.
Tax and salary tools are updated for each new tax year using official government rates from HMRC, the IRS, the ATO and the CRA, and each calculator page explains the rates and assumptions behind its numbers. Popular starting points: take-home pay for your exact salary, mortgage repayments at today's rates, or a pixel-accurate preview of how your website appears in Google. The DIY SEO guide walks through every on-page and technical SEO task with free browser tools.