If for some crazy reason you still don’t have a unit converter app for your iPhone or iPod touch, or if you despise your current unit converter, we have some great news for you.  Convertbot by Tapbots is a solid unit converter with a fantastic user interface that is now available in the App Store for free, but only for a limited time.

Convertbot is able to convert currency, length, mass, time, and much more.  It now features over 440 different types of units.  It is also able to convert mixed units so you won’t have to convert anything in your head before entering it into the app.  The real treat is Convertbot‘s user interface.  It is so unique and easy to use that it was even nominated in our AppAwards for Most Innovative User Interface category.

Convertbot is normally priced at $.99, but it is now free for a very limited time.

Embedded below is a video demonstration of Convertbot in action.