Nitrox Buddy is a no-frills calculator app for nitrox/enriched air divers - use it to quickly calculate the most important data for your dive: Maximum Operating Depth/MOD, Equivalent Air Depth/EAD, Best Mix and PPO2.
The app works with imperial or metric measurements, sea or fresh water, and allows you to select the maximum oxygen content and partial pressure.
A companion watch app puts lets you perform all these calculations on your wrist.