Startups

Startups worth watching

Companies in any sector. A Uses AI tag appears when the listing records that the company uses AI.

Listed after a verified homepage and sources. No invented size or price.

13,040 companies

Directory
Company	Category	Region	Status	Sources	Links
Quilt DataQuilt manages data like code so that companies can experiment faster	OtherUses AI	San Francisco, CA, USA; Remote		Docs	Open homepage
QuindarDatadog for Space	OtherUses AI	Denver, CO, USA		Docs	Open homepage
QuippyHelps build social skills through daily practice	VerticalUses AI	San Francisco, CA, USA		Docs	Open homepage
Quivly AIAI agents that run onboarding, adoption, and renewals	VerticalUses AI	San Francisco, CA, USA		Docs	Open homepage
Quo (fka OpenPhone)The all-in-one business phone for teams.	OtherUses AI	San Francisco, CA, USA; Remote		Docs	Open homepage
Quotient LabsUse Claude Code at 47% less cost in one line of installation.	AI infraUses AI	San Francisco, CA, USA		Docs	Open homepage
RabbetThe financial foundation for every real estate development decision	OtherUses AI	Denver, CO, USA		Docs	Open homepage
RadicalBuilding persistent, high-performance infrastructure in the sky	RoboticsUses AI	Seattle, WA, USA		Docs	Open homepage
RainbowOpen-source, design centric software for interacting with blockchains	OtherUses AI	New York City, NY, USA; New York, NY, USA		Docs	Open homepage
Rainforestno-code end-to-end testing that integrates with any CI/CD pipeline	OtherUses AI	San Francisco, CA, USA; Remote		Docs	Open homepage
RallyAgentic User Research Infrastructure	OtherUses AI	New York City, NY, USA; Remote	1 open	Docs	Open homepage
Raptor MapsRaptor Maps builds software to manage the solar PV lifecycle.	EnergyUses AI	Boston, MA, USA; Somerville, MA, USA; Remote		Docs	Open homepage
RarebirdElevating mental health to be a part of your daily coffee ritual.	OtherUses AI	San Francisco, CA, USA; San Leandro, CA, USA		Docs	Open homepage
RasynMaking chemicals 100,000x faster	VerticalUses AI	San Francisco, CA, USA		Docs	Open homepage
RationalFirst Zero-human Accounting Firm	VerticalUses AI	San Francisco, CA, USA		Docs	Open homepage
RavionThe easiest way to use AWS for agents and humans	OtherUses AI	Dayton, OH, USA; Remote		Docs	Open homepage
RavnRavn is building a heads-up display for soldiers.	OtherUses AI	Boston, MA, USA; San Francisco, CA, USA		Docs	Open homepage
RaycasterAgentic AI for knowledge work	VerticalUses AI	New York City, NY, USA		Docs	Open homepage
ReachLong range, wireless energy distribution that scales	EnergyUses AI	San Francisco, CA, USA		Docs	Open homepage
ReadilyAI Compliance Platform for Healthcare Organizations	VerticalUses AI	San Francisco, CA, USA		Docs	Open homepage
ReadMeBeautiful, personalized, interactive developer hubs	OtherUses AI	New York City, NY, USA; New York, NY, USA		Docs	Open homepage
ReadyCollaborative platform for optimizing regulated utilities such as…	OtherUses AI	San Francisco, CA, USA; Remote	6 open	Docs	Open homepage
RealRootsIRL friendship app for women	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
Reason MachinesReason Machines builds Reason Agent, the autonomous software engineer…	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage

Staff list a company once its homepage loads and one to three sources back it up. Map pins use a sourced city or region — near that place or at the region centroid. Unknown location stays list-only. Founders, exit, and jobs stay omitted unless sourced. Founder photos stay omitted unless a sourced URL is listed — we never invent a face. We do not invent people, a street address, or size, price, or growth figures.