head to head · open source
excelize vs Billion Mail
excelize has 21,036 GitHub stars, 1,984 forks, 131 open issues and last shipped yesterday. Billion Mail has 16,171 stars, 1,801 forks, 236 open issues and last shipped 5 months ago. excelize leads on adoption by 30% (21,036 vs 16,171 stars). excelize is written in Go under BSD-3-Clause; Billion Mail is written in Go under AGPL-3.0. excelize has attracted 9% as many forks as stars, Billion Mail 11%. 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.
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Side by side
| excelize | Billion Mail | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 16K |
| License | BSD-3-Clause | AGPL-3.0 |
| Written in | Go | Go |
| Last push | 2026-11-02 | 2026-06-11 |
| Forks | ⑂ 2.0K | ⑂ 1.8K |
| 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 Billion Mail if
- You want the Billion Mail feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Go
- You evaluated both and Billion Mail 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 Billion Mail
BillionMail 📧 An Open Source MailServer, NewsLetter, Email Marketing Solution for Smarter Campaigns [![][license shield]][license link] [![][docs shield]][docs link] [![][github release shield]][github release link] [![][github stars shield]][github stars link] English 简体中文 日本語 Türkçe What is BillionMail? BillionMail is a future open source Mail server, Email marketing platform designed to help businesses and individuals manage their email campaigns with ease. Whether you're sending newsletters, promotional emails, or transactional messages, this tool will provide full control over your email marketing efforts…
read the full Billion Mail overview →
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Frequently asked questions
Is excelize or Billion Mail more popular?
excelize has 21,036 GitHub stars and Billion Mail has 16,171. excelize has the larger community by that measure.
Are excelize and Billion Mail free?
Both are open source. excelize is licensed under BSD-3-Clause and Billion Mail under AGPL-3.0. Neither carries a licence fee.
What is the difference between excelize and Billion Mail?
excelize is written in Go and Billion Mail in Go. 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 Billion Mail?
Choose excelize if you want the larger community (21,036 stars) or its BSD-3-Clause licence terms. Choose Billion Mail if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.