Marvin: AI for the accounting of companies and NGOs in El Salvador
Marvin
AI implementation / Custom software
React · Python · PostgreSQL
Marvin, our own product: an AI that reviews the books of Salvadoran companies and NGOs every morning and flags problems before they grow. Code does the math; the AI only explains what has already been calculated.
- Scope of work
- AI implementation / Custom software / Own product / AI Implementation / Web Design
- Technology
- React / Python / PostgreSQL
- Client
- Marvin
- Year
- 2026

Can an AI review a company's books without making up numbers?
Marvin is Le Website Tech's own product for companies and NGOs in El Salvador. You have to ask ChatGPT; Marvin speaks first: it sits inside the organization's numbers, reviews them every morning and writes when there is something to say, with the figure, what it means and what to do.


What we did
How does an AI for small business accounting in El Salvador work?
An engine that calculates and an AI that only interprets.
Data comes in once a month: the accountant's close in a template, the balance sheet from any system and, optionally, the electronic invoices filed with the tax authority. Every file is stored exactly as it arrived.
A deterministic engine calculates eleven indicators with their formulas in plain view and watches 27 Salvadoran tax obligations; every figure can be traced back to its source document.
The AI writes, it does not analyze: it receives the finding already calculated, drafts the alert in Salvadoran Spanish and goes through gates that reject any number not present in the input. Anything sensitive goes through a human advisor before it reaches the client.
Each organization has its own separate space, and the review runs every morning at 7:00.
We also designed marvinn.io: collage illustration, a warm local voice and a demo by role —NGO director, business owner, administration— showing what Marvin would have written that week.



The result
How much does Marvin, the AI for company and NGO accounting, cost?
$150 a month per organization, with no lock-in.
It says less than a dashboard and gets read more: a clear email when there is something to say, and silence when everything is in order.
Live project
