Invoice Inn

Simple setup, handles high volume without issues.

Been using Invoice Inn for my Shopify store for a few months now and it's exactly what I needed. Setup took just a few minutes — you can customize the template yourself in simple steps, no coding required. I set my own invoice numbering from the start, which mattered for keeping continuity with my existing records.

I've sent more than two thousand invoices to customers through the app over these past 2 months, and it's held up reliably the whole time — invoices go out automatically once an order is fulfilled, so it's genuinely hands-off. VAT support works well too; no manual fiddling needed order by order.

If you're looking for invoicing that just runs in the background without extra hassle, even at real volume, this app delivers. Recommended.