head to head · open source
OpenContracts vs Addax
OpenContracts has 1,534 GitHub stars, 199 forks, 11 open issues and last shipped 3 days ago. Addax has 1,453 stars, 342 forks, 5 open issues and last shipped yesterday. OpenContracts leads on adoption by 6% (1,534 vs 1,453 stars). OpenContracts is written in Python under MIT; Addax is written in Java under Apache-2.0. OpenContracts has attracted 13% as many forks as stars, Addax 24%. Addax 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
| OpenContracts | Addax | |
|---|---|---|
| GitHub stars | ★ 1.5K | ★ 1.5K |
| License | MIT | Apache-2.0 |
| Written in | Python | Java |
| Last push | 2026-11-02 | 2026-11-04 |
| Forks | ⑂ 199 | ⑂ 342 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenContracts if
- You weight community size — 1.5K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Addax if
- You want the Addax feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and Addax fits your workflow better
About OpenContracts
OpenContracts (Demo) Open source document intelligence you can build on. Point OpenContracts at a repository of documents and get a programmable citation graph — human annotation, structured extraction, AI agents, and a built in MCP server, all behind one API. Self hosted, MIT licensed, and built for teams working at scale. Same graph, three surfaces: a GraphQL + REST API for your apps, a Model Context Protocol server for your agents, and a React UI for your team. From documents to a citation graph — in about a minute Create a corpus, drop in your documents, and click Set up . That one click installs the…
read the full OpenContracts overview →
About Addax
Addax A versatile open source ETL tool Addax is an extensible ETL (Extract, Transform, Load) tool supporting over 20 SQL/NoSQL data sources, forked from Alibaba's DataX , which has been frozen since 2023 — Addax is its actively maintained successor. It provides a growing ecosystem of plugins and offers easy to follow configuration for data integrations. 简体中文 🚀 Features Supports 20+ SQL and NoSQL data sources, and easily extendable for more. Configurable via simple JSON based job descriptions. Actively maintained with improved architecture and added functionality compared to DataX. Docker images for quick…
read the full Addax overview →
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Frequently asked questions
Is OpenContracts or Addax more popular?
OpenContracts has 1,534 GitHub stars and Addax has 1,453. OpenContracts has the larger community by that measure.
Are OpenContracts and Addax free?
Both are open source. OpenContracts is licensed under MIT and Addax under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenContracts and Addax?
OpenContracts is written in Python and Addax in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenContracts or Addax?
Choose OpenContracts if you want the larger community (1,534 stars) or its MIT licence terms. Choose Addax if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.