Interesting, I’ve been using https://simpleinvoices.io for a couple of years and really like it. Integrates with my Stripe and super easy to configure. Best of luck!

It looks nice at a glance, but there's just no way I can justify $15/mth for the few times a year I need to send an invoice. If https://bestfreeinvoice.com gains some amount of traction I'd love to extend the feature set to justify a paid tier, but the basic experience (i.e. what's currently live) will always be free and genuinely useful.

I have been using simpleinvoices.io for a few years too. It's great. (Just checked, 10 this year).