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
ReplitCollaborative in-browser IDE	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
RepoolModernizing hedge fund back office software and services.	OtherUses AI	New York City, NY, USA; New York, NY, USA		Docs	Open homepage
REPROSENTActivating an overlooked force in medicine - the patient.	OtherUses AI	San Francisco, CA, USA; Los Gatos, CA, USA; Remote		Docs	Open homepage
RescaleHigh Performance Computing Built for the Cloud	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
RescueTimeTake Back Control of your Time	OtherUses AI	Seattle, WA, USA; Remote		Docs	Open homepage
Resin TechnologiesResin helps engineers design electronics faster and more reliably	VerticalUses AI	San Francisco, CA, USA		Docs	Open homepage
ResponseOrganizing the world's inventory.	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
ResquaredMarketing automation platform for selling to local businesses.	OtherUses AI	Philadelphia, PA, USA; Remote		Docs	Open homepage
RethoricLinkedIn content consultancy and scheduling platform for busy founders	OtherUses AI	San Diego, CA, USA; Remote		Docs	Open homepage
RetoolBuild internal tools fast.	OtherUses AI	San Francisco, CA, USA	25 open	Docs	Open homepage
RetroFixAutomate any workflow using plain english	OtherUses AI	New York City, NY, USA		Docs	Open homepage
Rev GenomicsRev is a biotechnology company creating better plants.	OtherUses AI	San Francisco, CA, USA; Oakland, CA, USA		Docs	Open homepage
REV1Claude Code for Mechanical Engineers	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
RevenueCatBuild and grow your app business	OtherUses AI	San Francisco, CA, USA; Remote		Docs	Open homepage
Revise RoboticsAutomating refurbishment of $1T in consumer electronics	AgentsUses AI	New York City, NY, USA		Docs	Open homepage
Reviving MindAddressing Loneliness and Isolation for Seniors	OtherUses AI	San Francisco, CA, USA; Boston, MA, USA; Remote		Docs	Open homepage
RevoyMake diesel semi trucks hybrid-electric	EnergyUses AI	San Francisco, CA, USA; San Mateo, CA, USA		Docs	Open homepage
RewbiA stealth mode startup.	EnergyUses AI	San Francisco, CA, USA		Docs	Open homepage
Rhem LabsHome care technology for aging parents and their families	RoboticsUses AI	San Francisco, CA, USA		Docs	Open homepage
RightNowCo-designing the fastest intelligence	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
RingMDWe work with governments to implement telemedicine programs.	OtherUses AI	Charleston, SC, USA		Docs	Open homepage
RinseWe're building the One Medical for dental	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
RipplingOne place to run all your HR, IT, and Finance. Globally.	OtherUses AI	San Francisco, CA, USA		Docs	Open homepage
Rise ReformingWe turn waste gases into supply-secure chemicals	EnergyUses AI	Chicago, IL, 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.