Greenstamp helps accountants and accounting firms serve up to 150 clients with white-label self-service portals and AI-powered CFDI invoicing.
The Challenge
Accountants spend 25% of their time on manual invoicing. At 15 minutes per invoice with 53,000+ constantly changing SAT codes, 100 invoices = 25 hours of work.
More clients means hiring more staff—eating into your margins. No leverage. No scale. Just more manual work.
With Greenstamp, your clients create their own invoices. Our 20+ validators catch errors before SAT sees them. The result: 96% time reduction on bulk invoicing. What took 2 days now takes 5 minutes.
Features
Powerful tools that let your clients create their own invoices while you stay in control.
Manage 50+ companies from one screen. Switch RFCs with one click. See all pending approvals across all your clients.
Your logo, your colors, your domain. Your clients never see 'Greenstamp'. Present it as YOUR service to your clients.
Your client sends a message or photo via WhatsApp. AI extracts the data. Invoice generated automatically.
Upload the Constancia de Situación Fiscal. Client created instantly with all correct tax data. No copy-paste ever.
52,000+ product and service codes. AI suggests the right one. Fewer errors, faster data entry.
20+ validations before SAT. Zero rejections from format errors. Catch problems before they cost money.
How It Works
Getting started is simple. No lengthy onboarding calls or complex integrations required.
Securely upload your clients' CSD certificates. We encrypt and store them with bank-level security.
Each client gets their own branded portal. They can create invoices whenever they need, 24/7.
Your clients fill out a simple form. Our AI validates everything before it reaches you for review.
Review pending invoices, approve with one click, and we generate the XML, stamp with SAT, and deliver—all in seconds.
"55 clients is perfect. But once we have 100, 150... I'd have to grow the team and that would be a nightmare. I'd rather give the solution to the client, educate them. Self-service."
Our Mission
We believe the best accountants shouldn't be limited by operational work. By removing the friction from CFDI invoicing, we help accounting firms grow their practices, serve more clients, and focus on the strategic work that really matters.
What We Stand For
Mexican tax law is complex enough. We believe software should make things simpler, not add another layer of confusion. Every feature we build asks: 'Does this make our users' lives easier?'
We handle sensitive financial data and certificates. We take that responsibility seriously—with bank-level encryption, transparent practices, and no black boxes.
We're not here to gatekeep Mexican compliance knowledge. We translate requirements into plain language, explain errors in human terms, and help our users understand what's happening with their invoices.
CFDI compliance isn't going away. We're building a company and product meant to serve Mexican accounting firms for years to come—not a quick flip.
Join the firms that have already automated their invoicing. Free 14-day trial.
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