head to head · open source
excelize vs OpenOutreach
excelize has 21,036 GitHub stars, 1,984 forks, 131 open issues and last shipped yesterday. OpenOutreach has 3,478 stars, 626 forks, 1 open issues and last shipped 11 days ago. excelize leads on adoption by 505% (21,036 vs 3,478 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.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
← all 20902 open source comparisons
Side by side
| excelize | OpenOutreach | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 3.5K |
| License | BSD-3-Clause | GPL-3.0 |
| Written in | Go | Python |
| Last push | 2026-11-02 | 2026-10-23 |
| Forks | ⑂ 2.0K | ⑂ 626 |
| 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 Introduction Excelize is a library written in pure Go providing a set of functions that allow you to write to and read from XLAM / XLSM / XLSX / XLTM / XLTX files. Supports reading and writing spreadsheet documents generated by Microsoft Excel™ 2007 and later. Supports complex components by high compatibility, and provided streaming API for generating or reading data from a worksheet with huge amounts of data. This library needs Go version 1.25.0 or later. The full docs can be seen using go's built in documentation tool, or online at go.dev and docs reference. Basic Usage Installation If your…
read the full excelize overview →
About OpenOutreach
OpenOutreach — open source AI agent for B2B lead generation Describe your product. Define your target market. The AI finds the people who fit, tells you why each one does, and emails them. Self hosted CLI. One install, one onboarding, one command. Demo 🚀 What is OpenOutreach? OpenOutreach is a self hosted, open source lead finder that qualifies for you — and then writes the email. You describe your product and your target market; it discovers matching people from a licensed data provider , judges each one against the ICP it learned from your description, hands you the ones that fit with the reason each was…
read the full OpenOutreach overview →
More in Business Software
Related comparisons
More Marketing & Customer Engagement projects
Compare either of these against the rest of the Marketing & Customer Engagement field.
Frequently asked questions
Is excelize or OpenOutreach more popular?
excelize has 21,036 GitHub stars and OpenOutreach has 3,478. 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 (21,036 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.