Do you know if there will be an app version soon? Going to check out the site now.
There are no plans for apps at this point.
Once you've added your helicopters and clubs, the adding of sessions is very simple. You don't log batteries, fuel or spares, just the number of flights per helicopter at which field, with a description of how your flying went.
The website scales for mobile devices, so sometimes I update the session on my phone between flights, other times I just fill it in when I get home.
An additional feature that works well on some forums, is you can embed a custom image with overlays in your signature, and it will update automatically with your flying figures as you log. You can change the image at any time and it will update wherever it's being displayed. This is carzan's, click to see his flight log.