YCW22· AI· Data· DevtoolsSieve
The multimodal data lab
Founders
Not read from YC yet; the weekly run fills these in.
Same space
Competitors
Closest in what they build, same category.
SureformX25Real-world data and RL environments for frontier AIShared: data labelingActive
MarkovS26Expert computer-use data for frontier AI labsShared: data labeling, data engineeringActive
Perit.AIF26Expert-led data and RL platform for AI labsShared: data labelingActive
AfterQueryW25Applied research lab curating data solutions for foundation model…Shared: data labelingActive
CartpoleX25Building reinforcement learning environmentsShared: data labelingActive
Adjacent
Overlapping tags, a different niche.
LaminS22Open data platform for traceable, multimodal AIShared: developer tools, data engineeringActive
StreamdalS20Data Quality & Playback PlatformShared: developer tools, data engineeringInactive
Logarithm LabsW20Easy button to use data for your daily operationsShared: developer tools, data engineeringActive
BrieferS23The collaborative data platform.Shared: developer tools, data engineeringInactive
VimmerseW22Bring your photos to life with VimmerseShared: developer tools, videoActive
Also from W22 in AI
Batchmates in Winter 2022.
BeamW22AI-Native Cloud PlatformActive
BotCityW22Observability and Governance for AI-Generated Python scripts.Active
CodecW22Turn everyday videos into movies.Active
Dynamo AIW22Compliant-Ready AI for the EnterpriseActive
HomeRoomW22We Rent Your Property by the Room. You earn 50% more Rent.Acquired
LanceDBW22Open-source, serverless vectordb for production-scale generative AIActive
About Sieve
Sieve builds the data and environments frontier AI labs use to train the next generation of multimodal systems. AI is moving beyond chatbots into video, audio, images, software, robotics, and interactive worlds. The next generation of models will need to understand how the world looks, sounds, moves, responds, and changes over time. Progress is bottlenecked by one thing: high-quality data. Sieve brings together exabyte-scale infrastructure, novel multimodal understanding techniques, large-scale sourcing, and deep research partnerships to create datasets and environments with unmatched precision, quality, and speed. This has earned the trust of frontier AI labs, Fortune 100 companies, and fast-growing AI startups working on generative media, robotics, computer use, world models, and agentic systems.
San Francisco, CA, USA
Sieve: questions
Which YC batch was Sieve in?
Sieve was in Y Combinator's Winter 2022 batch (W22).
Is Sieve still active?
Y Combinator lists Sieve as active.
Where is Sieve based?
Sieve lists San Francisco, CA, USA as its location on YC's directory.
Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.