head to head · open source
excelize vs preswald
excelize has 20,920 GitHub stars, 1,949 forks, 131 open issues and last shipped today. preswald has 4,270 stars, 646 forks, 330 open issues and last shipped 3 months ago. excelize leads on adoption by 390% (20,920 vs 4,270 stars). excelize is written in Go under BSD-3-Clause; preswald is written in Python under Apache-2.0. excelize has attracted 9% as many forks as stars, preswald 15%. excelize was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai, analytics), 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 | preswald | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 4.3K |
| License | BSD-3-Clause | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-09-18 | 2026-06-11 |
| Forks | ⑂ 1.9K | ⑂ 646 |
| 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 preswald if
- You want the preswald feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and preswald 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 preswald
Preswald is an Apache 2.0 Python static site generator that packages interactive data apps — compute, data access, and UI — into self contained .html files that run entirely in the browser on a WebAssembly runtime built from Pyodide and DuckDB, aimed at analysts, data engineers, and developers who need to hand a working dashboard, report, or inspection tool to someone who will not install anything.
read the full preswald overview →
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Frequently asked questions
Is excelize or preswald more popular?
excelize has 20,920 GitHub stars and preswald has 4,270. excelize has the larger community by that measure.
Are excelize and preswald free?
Both are open source. excelize is licensed under BSD-3-Clause and preswald under Apache-2.0. Neither carries a licence fee.
What is the difference between excelize and preswald?
excelize is written in Go and preswald 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 preswald?
Choose excelize if you want the larger community (20,920 stars) or its BSD-3-Clause licence terms. Choose preswald if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.