Rational
YC S26 · Active · First Zero-human Accounting Firm
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
 CifratoShared: accounting firm, filing, operationsActiveAI | AI | Active | YCW25 |
 Last Accounting CompanyShared: accounting firm, finance, filingActiveAI | AI | Active | YCS26 |
 SorabanShared: accounting firm, clientActiveAI | AI | Active | YCW21 |
 BalanceShared: accounting firm, bookActiveAI | AI | Active | YCW26 |
 Billow AI LabsShared: accounting firm, financeActiveAI | AI | Active | YCS26 |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
 ModernbancShared: finance, accountingActiveAI | AI | Active | YCW20 |
 KintowShared: accounting firm, bookNot statedAI | AI | Not stated | speedrunSR005 |
 FinlensShared: accounting firm, finance, bookActiveAI | AI | Active | YCW20 |
 RecharglyShared: accounting firm, costNot statedOther | Other | Not stated | Antler2020 |
 QuantoShared: accounting firmNot statedAI | AI | Not stated | speedrunSR006 |
Also from S26 in AI
All of S26
Founders
- Jibril MoinuddinFounder/CEO
- Christ XuFounder/CTO
About Rational
Rational is building the first accounting firm with no humans. It's entirely run by our AI employees, who go from client intake to doing the books to filing with the IRS. We secure 90% cost reduction, 24/7 support, and an overall seamless experience for businesses.
- YC batch
- S26 · Summer 2026
- Status, per YC
- Active
- Category
- AI
- Team size
- 2
- Location
- San Francisco, CA, USA
- Founded
- 2026
- Checked
- 31m ago
YC tags: Artificial Intelligence, Finance, B2B, Enterprise
Rational: questions
Which YC batch was Rational in?
Rational was in Y Combinator's Summer 2026 batch (S26).
Is Rational still active?
Y Combinator lists Rational as active.
Who founded Rational?
Rational's founders, as listed on its YC page: Jibril Moinuddin (Founder/CEO), Christ Xu (Founder/CTO).
Where is Rational based?
Rational lists San Francisco, CA, USA as its location on YC's directory.
Sources: each program's public company list, read twice a week. Not affiliated with Y Combinator or any other program. Logos via logo.dev; trademarks belong to their owners.