Contasimple or FacturaHub? In one line: Contasimple is a cheap Spanish invoicing and accounting tool focused on "compliance without overpaying", built on web forms. FacturaHub also has a free plan, but you operate it by talking — with the AI, from Claude or the dashboard — with automatic IVA/IRPF and Modelo 303.
Contasimple wins if you want the cheapest possible option for basic invoicing and accounting from the browser and don't mind filling forms. It's a solid choice for those starting on a tight budget.
FacturaHub wins on speed and method: say "invoice Acme €2,000 for consulting" with the AI and the invoice is created with 21% IVA, IRPF and PDF; snap a receipt and input IVA is added to your Modelo 303. No forms.
Both are ready for Verifactu (mandatory July 2027 for freelancers). The real choice: cheap forms (Contasimple) vs AI-operated invoicing, without forms and from anywhere (FacturaHub).
Claude (MCP) or dashboard. Contasimple is web forms.
Both have a free option; FacturaHub adds AI and multi-channel.
Output vs input IVA, boxes ready for the AEAT.
Receipt photo → input IVA instantly.
It is free: invoices, expenses, Modelo 303 and Verifactu unlimited, with AI, Claude (MCP) and API included. The only thing metered is AI (10 free actions per month); if you need more, one-off token packs.
Yes: it calculates your quarterly output and input IVA and gives you the summary ready to copy into the AEAT form or hand to your accountant. You or your accountant file the 303.