I've been using one of the apps that works with Freshbooks as well, but recently have been using a trial version of
Chrometa and I love it.
It looks like it will take a bit of set up, but once you've done that it tracks everything you do on your computer, so even if you miss tracking something for your client you can back track by looking at the history....
Quite likely I'll move over to that when the trial version runs out.