Startup
Billow AI
Finance and accounting software built on AI agents: Billow connects to a company's NetSuite, QuickBooks and 80-plus other systems and runs month-end close, reconciliations, AP and budget commentary.
| Founded | 2026; Y Combinator Summer 2026 batch; based at 555 Bryant St, Palo Alto, with open roles in San Francisco |
|---|---|
| Founders | Jonathan McIntosh (CEO; repeat founder with an exit; built an AI/ML platform for regulated industries; accountant and financial analyst by training), Philip Moniaga (CTO; ex-Bloomberg, Booking.com, repeat YC founder) |
| Stage | Seed / Y Combinator |
| Total funding | Not disclosed beyond YC |
| What it does | Finance and accounting software, including a dashboard, AI agents and an Excel add-in: close, reconciliation, accounts payable, accrual estimates, budget-versus-actuals |
| Traction | Signed Series B to D companies worth over $1bn in enterprise value within three months |
| Pricing | From US$1,000 a month; monthly price agreed after mapping the work |
| Markets | US |
| Peers | Basis, Pilot, Kick |
Why it matters
Billow builds AI agents for finance and accounting teams, connecting to NetSuite, QuickBooks and more than 80 other systems. Founded in 2026 and backed by Y Combinator, it signed Series B to D companies representing over $1 billion in enterprise value in its first three months.
Part of Accountio’s accounting technology coverage.
Billow AI alternatives: compare the other vendors in this category →
In Accountio software guides
