Arroyo

Arroyo is ranked #7 of 23 in stream processing software on The Geeks Club. It runs on API, Linux, macOS, Self-hosted, Web. There is a free plan.

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Open-source Arroyo Engine Free Apache 2.0 licensed; single binary; self-hosted arroyo.dev · 4 Oct 2026

Compared on stream processing software

Deployment model: hybrid
SQL processing: Yes
Stateful processing: Yes
Event-time windows: Yes
Supported languages: SQL, Rust
Source connectors: 16

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Arroyo

Purpose: Arroyo is a distributed stream processing engine for stateful computations on data streams, with sub-second results.
SQL pipelines: Users define streaming pipelines with analytical SQL, including complex queries, windows, and joins.
Scale: Arroyo says it can scale to millions of events per second and supports horizontal and vertical rescaling.
Fault tolerance: The engine supports state checkpointing for fault tolerance and pipeline recovery, and exactly-once processing.
Connectors: Listed integrations include Kafka, Confluent Cloud, Kinesis, MQTT, NATS, MySQL, Postgres, Redis, Redpanda, Delta Lake, Iceberg, HTTP, WebSocket, and Webhooks.
Formats and functions: Arroyo natively reads and writes JSON, Avro, Parquet, text, and binary, and includes over 300 SQL functions.
User-defined functions: Users can extend SQL with Rust scalar, aggregate, and asynchronous user-defined functions.
Web UI and API: The Web UI supports managing connections, developing and testing SQL queries, and monitoring pipelines; pipelines can also be managed through a REST API.
Deployment: The single-node cluster is intended for testing and development; production deployments use a distributed cluster with Arroyo’s built-in scheduler or Kubernetes.
Supported storage: Checkpoint and artifact storage options include S3-compatible stores, R2, GCS, Azure Blob Storage, and local filesystems.
Security configuration: The Kubernetes deployment guide describes AWS IAM Roles for Service Accounts as the most secure way it covers to grant pods access to AWS resources.
Support: The deployment guide invites users rolling out clusters to contact [email protected] or ask questions on Discord.
Company history: Arroyo’s founders say they started the company in 2022 and open-sourced the engine in 2023.
Acquisition: Arroyo announced its acquisition by Cloudflare in April 2025 and said the engine would remain open-source and self-hostable.
Price from: Free

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Where it ranks on The Geeks Club

Best Stream Processing Software in 2026#7 of 23

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Sources

doc.arroyo.dev· checked 4 Oct 2026
arroyo.dev· checked 4 Oct 2026
doc.arroyo.dev/deployment/· checked 4 Oct 2026
doc.arroyo.dev/deployment/kubernetes/· checked 4 Oct 2026
arroyo.dev/blog/arroyo-is-joining-cloudflare/· checked 4 Oct 2026