Sintropix

Not yet independently verified. Dated from the Y Combinator launch post of 11 November 2026, as the site gives no launch date. The pages publish no prices and name no city or country. We will update this when it can be confirmed, and remove this note.

A start-up that sets up a US parent to raise money, or opens a subsidiary abroad, soon has two sets of books, two accounting firms and spreadsheets nobody trusts. Sintropix, founded by the brothers Alfonso and Borja, is built for that moment: it keeps the books for every entity and prepares each country's taxes.

Local books, one group view

Each entity keeps its own bank accounts, currency and ledger. Balances roll up into US dollars at daily exchange rates, so the group figure stays current, and a user can switch between a single country's books and the whole group without separate logins. Reconciliations, approvals and intercompany eliminations for every entity sit in one close queue. On top of the audited general ledger the product produces consolidated income statements and cash flow reports and forecasts runway under different hiring, revenue and spending scenarios.

Tax filing country by country

The service prepares taxes monthly, which in some of its markets is how often companies file. The site's examples include the US employer return (IRS Form 941), Mexico's SAT, Brazil's Receita Federal and Chile's SII monthly F29. An assistant called Erwin reports what is left before a month can close and matches bank transactions to open invoices for review. The founders say it is live in the United States, Mexico, Brazil and Chile. The site is in English and Spanish.

Key facts

Maker: Sintropix, founded by Alfonso and Borja Launched: Y Combinator launch post, 11 November 2026 Markets: United States, Mexico, Brazil, Chile Pricing: not published; demonstration by booked call Backed by: Y Combinator