I've written invoice PDFs with DomPDF. I've written them with wkhtmltopdf via Snappy. Both work. Neither produces output I'd want a customer to see if I cared about how the thing looked. DomPDF's CSS support is stuck somewhere around 2012, and Snappy hands you a wkhtmltopdf binary that renders fonts like it's still running on Windows XP.

The specific thing that pushed me off both of them was a client who wanted their invoices to match their brand guide. Inter font, a specific hex for the accent colour, rounded corners on the total row, a subtle shadow under the line items, and a small logo top-left. DomPDF rendered the Inter font as Times New Roman. Snappy got the font right but broke the border-radius.…