[davedx]

There are many different flavors of freelancers. I try to focus on serving one client well, but there are others who serve multiple clients, often tracking hours on multiple clients each week. I think they are more your target market.

[withinboredom]

I disagree. I focus on serving one client at a time, as well. Occasionally two, if one doesn't have enough work for me. I have a custom portal I built for tracking time/expenses, generating Stripe invoices, monitoring client budget, etc. Some clients want per-hour billing, some daily. Some want individual line-items (like a git commit, explaining exactly what I did with that time), and some don't care. If this project existed before I built that, I'd be using this project -- hands down.

Sadly, my portal already exists, and is deeply connected to Stripe and my way of doing business. So, I don't ever plan on doing what this person is doing. But I do highly suggest integrating it with Stripe Connect and make the project entirely free, and only charge a % of invoices total (like 1-5%). If it is free, people will use it. If they can send an invoice and automatically charge a client (assuming the client saved their billing information), that is money in the bank and you don't have to worry about collecting or them paying late ... that is worth it's weight in gold, as a contractor.