head to head · open source
CocoIndex vs Etl.Net
CocoIndex has 11,572 GitHub stars, 900 forks, 83 open issues and last shipped yesterday. Etl.Net has 810 stars, 106 forks, 46 open issues and last shipped 2 days ago. CocoIndex leads on adoption by 1,329% (11,572 vs 810 stars). CocoIndex is written in Rust under Apache-2.0; Etl.Net is written in C# under MIT. CocoIndex has attracted 8% as many forks as stars, Etl.Net 13%. CocoIndex was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (etl), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| CocoIndex | Etl.Net | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 810 |
| License | Apache-2.0 | MIT |
| Written in | Rust | C# |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 900 | ⑂ 106 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick CocoIndex if
- You weight community size — 12K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Rust
- You value the larger contributor base for long-term maintenance
pick Etl.Net if
- You want the Etl.Net feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and Etl.Net fits your workflow better
About CocoIndex
CocoIndex is an open source incremental data transformation engine for AI workloads, built in Rust with a Python interface and positioned in the data engineering, ETL, indexing, and AI agent ecosystem. It turns codebases, meeting notes, inboxes, Slack, PDFs, and videos into continuously fresh context for AI agents and LLM applications.
read the full CocoIndex overview →
About Etl.Net
Etl.Net Go to full documentation :rotating light: I need some help!!! :ambulance: I need some serious help for the following subject: :books: Documentation. The website of ETL.NET needs to be completed. It contains the essential to start and get in touch, but a dramatic amount of serious features is not documented in there. :heavy check mark: Unit tests. A proper test code coverage is the only real way to be taken seriously when it is about selecting the right open source library. There was a time when some units tests existed only for the reactive engine of the core (Paillave.EtlNet.Core). But it happened I had …
read the full Etl.Net overview →
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Frequently asked questions
Is CocoIndex or Etl.Net more popular?
CocoIndex has 11,572 GitHub stars and Etl.Net has 810. CocoIndex has the larger community by that measure.
Are CocoIndex and Etl.Net free?
Both are open source. CocoIndex is licensed under Apache-2.0 and Etl.Net under MIT. Neither carries a licence fee.
What is the difference between CocoIndex and Etl.Net?
CocoIndex is written in Rust and Etl.Net in C#. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, CocoIndex or Etl.Net?
Choose CocoIndex if you want the larger community (11,572 stars) or its Apache-2.0 licence terms. Choose Etl.Net if its feature set, stack or MIT licence fits better. Both are self-hostable.