Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

s2.dev

Active · API for unlimited, durable, real-time streams

WebsiteYC profile

Why it ranks

How the rank works
8signal of 100 · rising 7
  • team of 5Team size · YC's directory+4
  • went through YCProgram · this site+4

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

Competitors

DataReJotShared: building block, databases, apiYC W25AmsterdamStartup →AITerseShared: api, infrastructure, durableYC F26New York CityStartup →AIExlaShared: building agent, infrastructure, fixYC W25San FranciscoStartup →Developer toolsAcquiredMoltinShared: building block, api, setYC W15BostonStartup →AI21stShared: building block, agentYC W26San FranciscoStartup →
Companies closest to s2.dev
Company
ReJotShared: building block, databases, apiYC W25ActiveData, Devtools
TerseShared: api, infrastructure, durableYC F26ActiveAI, Devtools
ExlaShared: building agent, infrastructure, fixYC W25ActiveAI, Devtools
MoltinShared: building block, api, setYC W15AcquiredDevtools
21stShared: building block, agentYC W26ActiveAI, Devtools

Adjacent

AITrellis AIShared: databases, infrastructure, accessYC W24San FranciscoStartup →AIClickShared: api, infrastructure, streamYC S26San FranciscoStartup →AIArchalShared: api, infrastructure, agentYC S26San FranciscoStartup →AIcamelAIShared: stream, unlimitedYC W24San FranciscoStartup →AIUbicloudShared: databases, infrastructure, blockYC W24San FranciscoStartup →
Companies next to s2.dev
Company
Trellis AIShared: databases, infrastructure, accessYC W24ActiveAI, Data, Devtools
ClickShared: api, infrastructure, streamYC S26ActiveAI, Devtools
ArchalShared: api, infrastructure, agentYC S26ActiveAI, Devtools
camelAIShared: stream, unlimitedYC W24ActiveAI, Data, Devtools
UbicloudShared: databases, infrastructure, blockYC W24ActiveAI, Data, Devtools

Also from F25 in AI

All of F25
AIAirCaps AIVoice AI that hears what other models miss.YC F25San FranciscoStartup →AIKestrel AIAI Agents for Platform EngineeringYC F25San FranciscoStartup →AILemmaProduction Monitoring for AI agentsYC F25San FranciscoStartup →AISourcebotHelping humans and AI agents understand massive codebasesYC F25San FranciscoStartup →AIAmikaTurn any spare computer into agent devboxes or CI runnersYC F25New York CityStartup →AIBolna AIVoice AI to enable India's next billionYC F25BengaluruStartup →
Company
AirCaps AIVoice AI that hears what other models miss.team of 5hiringActiveAI, Devtools
Kestrel AIAI Agents for Platform Engineeringteam of 2ActiveAI, Devtools
LemmaProduction Monitoring for AI agentsteam of 2hiringActiveAI, Data, Devtools
SourcebotHelping humans and AI agents understand massive codebasesteam of 3hiringActiveAI, Devtools
AmikaTurn any spare computer into agent devboxes or CI runnersteam of 2ActiveAI, Devtools
Bolna AIVoice AI to enable India's next billionteam of 21hiringActiveAI, Devtools

Founders

  • Shikhar BhushanFounder/CEO
  • Stephen BaloghFounder/CTO
  • Dwarak Govind ParthibanFounder

About s2.dev

S2 is an API for durable streams. We make working with streaming data dead simple and reliable. The more we worked on data systems, the more we felt like there was a missing building block. The seamless experience of object storage simply did not exist for durable streams – so we set out to fix that! S2 reimagines streams as an unlimited and access-controlled web resource. Like if Kafka and S3 had a baby. - Building agents? Use granular streams to persist context in real time, make workflows auditable, and coordinate between agents. - Publishing fast-moving data? Streams support high fanout and can be accessed directly over the internet, so they are a great fit for broadcasting real-time feeds. - Sandboxing? Emit to per-instance streams, and read history or live events just as easily. - Local-first and multiplayer experiences? Propagate updates reliably and efficiently. Stop dealing with clusters, and start streaming.

YC batch
F25 · Fall 2025
Status, per YC
Active
Category
AI, Data, Developer tools
Team size
5
Location
San Francisco, CA, USA
Founded
2024
Checked
6h ago

YC tags: Developer Tools, Open Source, API, Infrastructure, Databases

s2.dev in F25: 146 companies, 88% AI

GitHub LinkedIn

s2.dev: questions

Which YC batch was s2.dev in?

s2.dev was in Y Combinator's Fall 2025 batch (F25).

Is s2.dev still active?

Y Combinator lists s2.dev as active.

Who founded s2.dev?

s2.dev's founders, as listed on its YC page: Shikhar Bhushan (Founder/CEO), Stephen Balogh (Founder/CTO), Dwarak Govind Parthiban (Founder).

Where is s2.dev based?

s2.dev lists San Francisco, CA, USA as its location on YC's directory.