Best solution for bookkeeping? (I will not promote)

Hey r/startups , had an idea for some time about creating a book keeping solution for indie hackers and small startups. The logic behind it is that accountants can be expensive so a simple book keeping solution that also provides analytics, invoicing and budgeting at an affordable price could be a potentially good idea. I wanted to know more about the existing solutions in place so I would appreciate some feedback :)
(I will not promote)