Greenstamp is the AI copilot built for accounting firms. Your team handles the judgment calls — Greenstamp handles the volume: bulk invoicing, bill capture, bank reconciliation, and the compliance work that used to eat half their week.
The reality
Mexican e-invoicing eats up roughly a quarter of an accountant's week. Fifteen minutes per CFDI, thousands of SAT codes that keep changing, three formats per client, rejections that come back two days later. Your most experienced people are spending their afternoons on data entry.
That's not a hiring problem. It's a leverage problem. Every hour your team spends keying in invoice line items is an hour they're not spending on the advisory work clients actually value — and the work they actually trained for.
Your team keeps the judgment, the client relationships, and the final approval. Greenstamp's copilot picks up the volume: 100 invoices in five minutes instead of two days, bills captured from email or WhatsApp, bank reconciliation matched automatically, SAT codes suggested instead of looked up. Your accountants stay in control — they just stop drowning.
What Greenstamp does
Six things your team used to do manually. Now they review, approve, and move on.
One screen for every client. Switch entities in a click. See exactly what needs your team's attention today — and what's already handled.
Your logo, your colors, your domain. Clients see your firm — not us. Use it as your own self-service offering.
Your client sends a message or photo on WhatsApp. Greenstamp reads it, extracts the data, and drafts the invoice for your team to approve.
Bills arrive by email, WhatsApp, or upload. Greenstamp reads them, extracts the data, matches them to suppliers, and queues them for approval. No more retyping vendor invoices.
Thousands of product and service codes. Greenstamp suggests the right one based on the line description and the client's history. Your accountants confirm — they don't memorize.
20+ checks run before anything reaches the PAC. Rejections drop to near zero, because errors get caught at the keyboard, not two days later.
How it works
No long onboarding, no complex integration. Bring your clients in, configure the copilot, and let your team get back to real work.
Upload digital signing certificates, import client data from CSF documents, set up portal access. Greenstamp handles encryption and SAT integration.
Tell Greenstamp how your team likes to work — which approvals route to whom, which clients self-serve, which templates apply. It adapts.
Bulk invoicing, bill capture, reconciliation, SAT code suggestions — running in the background, queueing work for your team to approve.
Every CFDI gets a human review before it goes to SAT. You see exactly what the copilot did and why. Nothing leaves your office without an accountant's sign-off.
"We hit 55 clients with a team I'm proud of. Greenstamp lets us get to 150 without diluting what makes us good — my accountants still do the work that needs judgment, and the copilot handles the rest."
Our Mission
We believe the best accountants shouldn't be limited by operational work. By removing the friction from electronic invoicing, we help accounting firms grow their practices, serve more clients, and focus on the strategic work that really matters.
What We Stand For
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 compliance knowledge. We translate requirements into plain language, explain errors in human terms, and help our users understand what's happening with their invoices.
Electronic invoicing compliance isn't going away. We're building a company and product meant to serve accounting firms for years to come—not a quick flip.