Ukrainian-founded · YC S18
Quo
Quo, formerly OpenPhone, is a San Francisco communications platform co-founded by Ukrainian-Canadian entrepreneur Daryna Kulya. It announced $105 million in growth financing in September 2025.
- Accelerator
- YC Summer 2018
- Stage
- Growth financing ↗
- Hiring
- Hiring ↗
- Founded
- 2018
- Location
- San Francisco
- Focus
- AI · Business communications
- Status
- Active
Why it’s hot
$105M in growth financing in September 2025 alongside the OpenPhone-to-Quo rebrand and expansion of its Sona AI agent.
Funding stage
$96M customer-value financing plus $9M in equity, announced in September 2025.
Verify stage ↗Ukrainian connection
Quo’s official founder biography identifies co-founder Daryna Kulya as Ukrainian-Canadian. The company grew from Canadian roots into a San Francisco platform serving global small businesses.
Founders
Daryna Kulya
Co-founder · Ukrainian-Canadian co-founder whose official biography describes Kyiv as home.
LinkedIn profile ↗Mahyar Raissi
Co-founder and CEO · Co-founded Quo with Daryna Kulya and scaled it in the U.S. market.
LinkedIn profile ↗Sources
We use public primary sources where possible and identify exactly what each source supports.
- OpenPhone becomes Quo and raises $105M ↗Quo · Supports: funding, momentum, name change, product.
- Quo company profile ↗Y Combinator · Supports: company, batch, founders, location, status.
Last reviewed: August 7, 2026. Read the methodology.