Any decent auto invoice generation tools?

Looking for a tool to automatically send out invoices on the Xth day of the month. All that really needs to be updated is:

- invoice number
- date
- due date

Price is fixed every month. I've been doing them manually until now but honestly I can't even be bothered now. I only have a few clients but I imagine there's some tool out there for pennies that would handle this for me.

I don't need payment processing. I just need the invoice generated.

Who do you guys use? QuickBooks?

Depends on the form. I feel these should be automated with zapier and gravity

I am looking to same tools. Thanks for posting

Possibly Xero coupled with gocardless will do this, as well as payment collection if required.