Which YC batch was Arroyo in?

Arroyo was in Y Combinator's Winter 2023 batch (W23).

Is Arroyo still active?

Y Combinator lists Arroyo as acquired.

Where is Arroyo based?

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

Arroyo: YC W23 company, acquired

Founders

Not read from YC yet; the weekly run fills these in.

Same space

Competitors

Closest in what they build, same category.

BeamW22AI-Native Cloud PlatformShared: developer tools, open source, cloud computingActive
s2.devF25API for unlimited, durable, real-time streamsShared: developer tools, open sourceActive
CakeworkW23API that adds cloud hosting to any developer platformShared: developer tools, cloud computingInactive

Adjacent

Overlapping tags, a different niche.

WebinyW21Open-source framework for building serverless applicationsShared: developer tools, open sourceActive
infra.newW23AI Agent for Cloud InfrastructureShared: developer tools, cloud computingActive
ReplicateW20Run machine learning models in the cloudShared: developer tools, open sourceAcquired
HopliteS26Effortlessly deploy cloud software factories.Shared: developer tools, cloud computingActive
MaritimeF26The managed cloud for AI agents.Shared: developer tools, cloud computingActive

Also from W23 in Developer tools

Batchmates in Winter 2023.

About Arroyo

Arroyo is a serverless stream processing platform built on top of the open-source Arroyo streaming engine. We allow companies to transform, filter, aggregate, and join their Kafka streams in real-time just by writing SQL. We charge purely based on usage, with no fixed costs or clusters to manage. In 2025, Arroyo was acquired by Cloudflare and now powers Cloudflare Pipelines

San Francisco, CA, USA