I've been in the same boat as you and replaced it last year but still pay for harvest (grandfathered pricing) until I can be sure I don't need it. I'm almost up to renewal and haven't used it at all since trying app.solidtime.io

I'll be honest it's not as good as harvest. The mac app is a bit buggy, it's not as easy to add manual time, and you need to pay for pdf export. But having said that I've found the free version to cover 90% of my use of the paid version of harvest