Go-Kart Hippo is a scheduling and billing app for one-person service businesses that work at the customer's home.

We make one product. A house cleaner, a lawn or pool or pest route, a handyman: they keep their visits on it, it writes their clients' appointment reminders for them to send from their own phone, they mark each visit paid, and it makes a receipt or an invoice when one is wanted. The provider pays us a flat monthly subscription. We never hold or move money. Clients pay their provider directly, by whatever method the provider accepts.