Fed up with Freshbooks price hikes - does a simple, well designed, self-hostable invoicing tool even exist? Would you use it?

I’m trying to move off Freshbooks at my small creative dev studio. Their UX is great, it's really polished. But they’ve hiked the price twice in recent years, and now it’s $360 a year, and we don't need any of the advanced features like email reminders, paypal/stripe integration etc. Just a regular invoice creation, simple recurring invoices, and functional incremental invoice number.

But I'm shocked! There’s no straightforward, well-designed, self-hostable invoicing software out there. Or I couldn't find one. In a market full of bloated, overpriced tools, nobody’s built something simple that small companies can use without being charged per client.

Should I make one?