August

Pros: It is so intuitive to use. I uploaded my tenancy agreements and it filled in everything! Market value, EPC rating, tax bands, compliance dates, even property-specific action lists. What used to take me hours and hours of tedium entry data manually took less than 5 minutes for all five properties.
Getting my tenants on board was just as easy. I can upload a certificate or agreement and send it off with the click of a button. No more printing or scanning. It is difficult to find software that does this much without being complex.

Cons: They still don't allow to log expenses so I can't get rid of my spreadsheet yet. Also I wish they had all the calculators on the website in the app.

Overall: I almost got a massive penalty when my electrical safety certificate expired without me even realizing it. August picked it up three weeks before the expiration date and sent me a complete reminder with what I had to do next, so I managed to schedule an electrician and passed the test two days prior to the deadline. One of those notifications paid for the app dozens of times over.