Harvest is one of those apps with a cult-like user base. I've never heard a bad review of the product. It's a good case study in building something 100 people love that solves an acute and annoying problem.

We use this religiously at Strategyzer. They have a Chrome extension that integrates with Trello cards so you can track time and associate it with specific cards you're working on.

Great product - we went through several time tracking apps on our journey to use Harvest and this is the best for us.

The Asana integration is wicked!

Whilst the UI is ever so slightly dated and some functions can be a little hard to find than they should be but on a whole it is, in fact, very functional and infinitely better than some pretty but clunky app.

Highly recommended.

Pros:

Really convenient Mac app makes starting time tracking easy. Nice integration to Asana. And a rather nice Forecast companion app.

Cons:

The UI is ever so slightly dated and the whole invoicing thing is a bit too controlling (we dont use it though!)

It is good, but boy is it expensive for a time tracker

I've used Harvest for a while. Love it.