S2 is an API for durable streams. We make working with streaming data dead simple and reliable.
s2.dev is a Y Combinator company in the Fall 2025 batch. Its directory entry describes it as: API for unlimited, durable, real-time streams. The founders listed are Shikhar Bhushan (Founder/CEO), Stephen Balogh (Founder/CTO) (Y Combinator directory entry, September 29, 2025).
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New accelerator entry · 2025-09-29 · the record
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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.
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