Side by side
Arroyo vs Esper
Both stand on stream analytics software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Open source APILinuxMac+2
Arroyo combines SQL-based streaming, recovery features, and a broad connector list in a self-hostable engine. Plan for a distributed cluster for production use.
Visit Arroyo Free plan Open source APILinuxMac+2
Choose Esper if you are building Java or .NET software that needs complex event processing with SQL-derived event queries and an embeddable runtime. Look elsewhere if you need a standalone server, or evaluate Esper Enterprise Edition for the listed scale-out architecture and commercial licensing for redistribution.
Visit EsperThe facts
| Arroyo | Esper | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Yes | Yes |
| Runs on | API, Linux, Mac, Self-hosted, Web | API, Linux, Mac, Self-hosted, Windows |
| Lowest paid plan | Cloudflare Workers Paid with Pipelines: $5 a month | Free or on request |
| Plans published | 3 | 5 |
| Maker | Not published | Not published |
| Website | arroyo.dev | espertech.com |
| On stream analytics software | #1 of 26 | #2 of 26 |
Arroyo: what it does well
- Free, open-source, Apache 2.0 licensed engine
- SQL supports complex queries, windows, and joins
- Over 300 SQL functions and Rust extensions
- Checkpointing and exactly-once processing
- Web UI and REST API for pipeline management
What to know first
- Production deployments require a distributed cluster
- Single-node cluster is for testing and development
Esper: what it does well
- EPL extends SQL for expressions over events and time.
- Compiles EPL into bytecode distributable in JAR files.
- Adapters cover CSV, JMS, HTTP, Kafka, databases and sockets.
- Can join events with web services and relational databases.
- Free Esper 9.0.0 release is listed under GNU GPL (GPL v2).
What to know first
- Esper and NEsper are embedded components, not standalone servers.
- Scale-out capabilities are described for Enterprise Edition.
- EsperTech offers commercial redistribution licenses.
- Developer Seat support excludes bug fixes and training.