Used For

• +**Manual invoice creation taking 20+ minutes each** → 10-second invoice generation with tax calculations done automatically
• +**Copying WooCommerce orders into accounting software by hand** → Orders sync directly to invoices without touching a spreadsheet
• +**Spending hours on Spanish tax forms every quarter** → One-click tax form generation with pre-filled amounts
• +Electronic signature capability - invoices are legally signed and tamper-proof
• +Direct debit collection - automatically pulls payments from customer accounts

Best For

• >Solo freelancers drowning in invoice paperwork and tax forms
• >Small EU businesses needing electronic signatures and tax compliance
• >WooCommerce store owners manually copying order data into invoices

Not For

• -Companies outside Spain/EU — the tax features are built for Spanish regulations
• -Businesses needing project management or advanced CRM — this is just invoicing and basic accounting
• -Teams wanting self-hosted solutions — it's cloud-only with no on-premise option

Pairs With

• *WooCommerce (orders automatically become invoices without manual data entry)
• *PrestaShop (same automatic order-to-invoice sync as WooCommerce)
• *Google Sheets (for expense tracking that ContaSimple doesn't handle as well)
• *Stripe (to actually collect the payments that ContaSimple invoices)
• *Gmail (sends invoices directly through your corporate email)
• *Dropbox (stores invoice documents in cloud storage for easy access)

The Catch

• !Free plan has 'limited documents' but they won't tell you the exact limit upfront
• !The tax automation is laser-focused on Spain/EU — other regions get basic invoicing without the smart compliance stuff
• !Owned by Cegid (enterprise software company) so expect feature creep toward more complex offerings over time

Bottom Line

The invoice creation is genuinely fast, but you're basically paying for Spanish tax compliance automation.