head to head · open source
excelize vs OpenOutreach
excelize has 20,924 GitHub stars, 1,954 forks, 131 open issues and last shipped today. OpenOutreach has 3,041 stars, 560 forks, 1 open issues and last shipped 13 days ago. excelize leads on adoption by 588% (20,924 vs 3,041 stars). excelize is written in Go under BSD-3-Clause; OpenOutreach is written in Python under GPL-3.0. excelize has attracted 9% as many forks as stars, OpenOutreach 18%. excelize was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (agent), 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
| excelize | OpenOutreach | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 3.0K |
| License | BSD-3-Clause | GPL-3.0 |
| Written in | Go | Python |
| Last push | 2026-09-20 | 2026-09-07 |
| Forks | ⑂ 2.0K | ⑂ 560 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick excelize if
- You weight community size — 21K stars and counting
- You want the BSD-3-Clause license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick OpenOutreach if
- You want the OpenOutreach feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Python
- You evaluated both and OpenOutreach fits your workflow better
About excelize
Excelize is a pure Go library for reading and writing XLAM, XLSM, XLSX, XLTM and XLTX spreadsheets, built for Go developers who need to generate or parse Microsoft Excel 2007 and later workbooks directly from their own code.
read the full excelize overview →
About OpenOutreach
OpenOutreach is an open source AI agent for B2B lead generation, written in Python and licensed under GPL 3.0. It is a self hosted CLI that lets a user describe a product and target market, then finds matching people from a licensed data provider and judges each one against an ideal customer profile learned from those descriptions.
read the full OpenOutreach overview →
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Frequently asked questions
Is excelize or OpenOutreach more popular?
excelize has 20,924 GitHub stars and OpenOutreach has 3,041. excelize has the larger community by that measure.
Are excelize and OpenOutreach free?
Both are open source. excelize is licensed under BSD-3-Clause and OpenOutreach under GPL-3.0. Neither carries a licence fee.
What is the difference between excelize and OpenOutreach?
excelize is written in Go and OpenOutreach in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, excelize or OpenOutreach?
Choose excelize if you want the larger community (20,924 stars) or its BSD-3-Clause licence terms. Choose OpenOutreach if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.