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14,448 startups · 29 programs

SID

Active · AI research center for retrieval

WebsiteYC profile

Why it ranks

How the rank works
11signal of 100 · rising 4
  • team of 7Team size · YC's directory+4.7
  • went through YCProgram · this site+4
  • hiringHiring · Titles (titles.fru.dev), YC+2

A sum of public facts, not a judgement and not investment advice.

Competitors

AIRysticShared: train modelYC F26San FranciscoStartup →AIAirweaveShared: data source, retrievalYC X25San FranciscoStartup →AIOpEraShared: research centerYC F26San FranciscoStartup →AICarbonShared: data source, retrieval, model500 Global 2022United StatesStartup →
Companies closest to SID
Company
RysticShared: train modelYC F26ActiveAI, Devtools
AirweaveShared: data source, retrievalYC X25ActiveAI, Devtools
OpEraShared: research centerYC F26ActiveAI
CarbonShared: data source, retrieval, model500 Global 2022Not statedAI

Adjacent

OtherMarqoShared: retrieval, retrieve, trainGoogle AI First Australia 2024Startup →OtherNubrainShared: train model, dataBetaworks AI Camp: InterfacesStartup →OtherAtomionicsShared: research center500 Global 2019SingaporeStartup →AIShapedShared: retrieval, retrieve, trainYC W22New York CityStartup →DataParadeDBShared: infrastructure, retrieval, dataYC S23San FranciscoStartup →
Companies next to SID
Company
MarqoShared: retrieval, retrieve, trainGoogle AI First Australia 2024Not statedOther
NubrainShared: train model, dataBetaworks AI Camp: InterfacesNot statedOther
AtomionicsShared: research center500 Global 2019 +1Not statedOther
ShapedShared: retrieval, retrieve, trainYC W22ActiveAI, Data, Devtools
ParadeDBShared: infrastructure, retrieval, dataYC S23ActiveData, Devtools

Also from S23 in AI

All of S23
AIAutomorphicInfuse knowledge into language models with just 10 samplesYC S23San FranciscoStartup →AICedanaFast, reliable, reproducible AI with GPU live migrationYC S23New York CityStartup →AIConvergeAI-native growth platform for DTCYC S23New York CityStartup →AIHarnessRouterThe world's first unified interface for agent harnesses.YC S23San FranciscoStartup →AIHiroAgents that handle security workYC S23New York CityStartup →AIInactiveLeafpressAI Energy ManagementYC S23Startup →
Company
AutomorphicInfuse knowledge into language models with just 10 samplesteam of 3ActiveAI, Devtools
CedanaFast, reliable, reproducible AI with GPU live migrationteam of 5hiringActiveAI, Devtools
ConvergeAI-native growth platform for DTCteam of 13hiringActiveAI, Data, Devtools
HarnessRouterThe world's first unified interface for agent harnesses.team of 3ActiveAI, Devtools
HiroAgents that handle security workteam of 2ActiveAI, Devtools
LeafpressAI Energy Managementteam of 2InactiveAI, Devtools

About SID

SID is an AI research center based in San Francisco. We train models that can retrieve and reason over any data source.

YC batch
S23 · Summer 2023
Status, per YC
Active
Category
AI, Developer tools
Team size
7
Location
San Francisco, CA, USA
Checked
6h ago

YC tags: Infrastructure, AI

Changes seen

TagsOct 19, 2026

No longer tagged Artificial Intelligence.

Source ↗
One-linerOct 5, 2026

Rewrote its one-liner; it read "AI research lab for retrieval"

Source ↗

SID in S23: 220 companies, 78% AI

SID: questions

Which YC batch was SID in?

SID was in Y Combinator's Summer 2023 batch (S23).

Is SID still active?

Y Combinator lists SID as active.

Where is SID based?

SID lists San Francisco, CA, USA as its location on YC's directory.