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Flat Invoice vs aiDoks

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Flat Invoice compared with aiDoks
Detail Flat InvoiceaiDoks logo aiDoks
What it doesSend the invoice. Skip the chasing. Not given
StageNot given Startup
FoundedNot given 2025
Based inUS EE
Pricing modelFreemium Freemium
Pricing3 invoices per month free, then $2 per invoice. Pro plan: $9 per month or $79 per year for unlimited invoices. Edits, resends and reminders are free. Free: €0 forever with 6 invoice generations per month, 6 format conversions per month, 10 invoice validations per month, 10 PDF previews per month, 6 e-invoice parsing operations per month, 1 AI PDF conversion per month without an account, and 3 AI document scans per month. Pro: €4.85/month with unl
Key features
  • Automatic payment reminders on day 3, 7 and 14
  • Late fee calculator with interest calculation
  • Ready-to-send reminder email templates
  • Direct client payments
  • Optional Stripe integration for card and bank payments
  • Free edits and resends
  • Free late fee calculator tool
  • Unlimited invoice drafts on free plan
  • AI-powered OCR extracts invoice data from PDFs, scans and photos including QR codes
  • PEPPOL BIS 3.0 compliant invoice generation and validation
  • PDF to UBL XML conversion
  • Real-time automatic invoice calculations
  • EU VAT validation with country-specific rules
  • Multi-language support in 8 languages
  • Business Partner Management to save supplier and customer data
  • Reusable invoice form templates
  • Support for 12 e-invoice formats including XRechnung and Factur-X
  • Browser-based with no installation required
What makes it different
  • Never touches client payments or takes a percentage
  • Automatic reminders reduce payment chasing
  • Free late fee calculator included with service
  • Simple pricing with no setup fees
  • Completely free with no signup required for all core e-invoicing tools
  • AI-powered OCR instantly converts paper invoices and PDFs to structured e-invoices
  • EN 16931 compliant with 99.9% uptime guarantee and PEPPOL certification
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)01
Citation Flow (Majestic)1223
Referring domains (Majestic)319

5 details filled in for both companies.

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