By personal use, I mean not using it for work. You may be using Github purely for personal use, but Harvest is clearly for business.

Do you pay for any other apps?

You're correct; my Harvest use is only personal in the sense that I have a single-user account.

However, I do pay for Netflix ($9/month) and TurboTax ($75/year) for non-business use. I used to pay for .Mac, as well.