I built this because I was tired of conversion websites that are slow, full of pop-ups, and loaded with tracking scripts.
The Conversion Atlas does everything locally in your browser—no data is ever sent to a server. It covers 674 unit converters across 16 categories (length, weight, temperature, speed, volume, etc.), and results update instantly as you type.
Tech-wise, it's all vanilla JavaScript with precise formulas—no rounding hacks. The goal was to make something fast, accurate, and completely clutter-free.
Would love your feedback on:
- Any missing unit types you'd find useful
- Performance on mobile
- The overall UX
Thanks for taking a look!
I like the decision to keep everything client-side. For a utility like this, speed and trust are part of the product. People shouldn't have to wait for a server—or wonder where their data is going—just to convert a unit.
This is clean.
My main question is around positioning most people already use Google or built-in OS converters, so what’s the main moment that makes someone switch to this instead of just searching quickly?
I think the value here depends a lot on the specific workflow where speed + no distractions matters more than convenience tools.