Much better than most other calculators.

Give it a try, it’s free!

This calculator is the only one that meets all my need among the 5 calculator apps I just testet in App Store.
1. You can choose to let it fade or hide when not focused, exactly what I needed.
2. It launches very quickly.
3. It keeps your equation so you know what you’re calculating, and you can even continue adding stuff after getting inital answer.
4. You can copy the answer with mouse or keyboard, although copying using keyboard takes more than necessary keys.

I would donate if there’s a link to do so.

VicCube about Handy Calculator