head to head · open source
BillionMail vs preswald
BillionMail has 16,185 GitHub stars, 1,803 forks, 239 open issues and last shipped 5 months ago. preswald has 4,270 stars, 647 forks, 330 open issues and last shipped 5 months ago. BillionMail leads on adoption by 279% (16,185 vs 4,270 stars). BillionMail is written in Go under AGPL-3.0; preswald is written in Python under Apache-2.0. BillionMail has attracted 11% as many forks as stars, preswald 15%. preswald 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
| BillionMail | preswald | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 4.3K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-06-11 | 2026-06-11 |
| Forks | ⑂ 1.8K | ⑂ 647 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick BillionMail if
- You weight community size — 16K stars and counting
- You want the AGPL-3.0 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 BillionMail
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 BillionMail overview →
About preswald
Create interactive data apps with a full data stack that runs in the browser (no local dependencies!),runs offline, and is shareable in a single file. What is Preswald? Preswald is a static site generator for building interactive data apps in Python. It packages compute, data access, and UI into self contained data apps that run locally in the browser. Built on a WASM runtime with Pyodide and DuckDB, Preswald enables portable, file based apps that are fast, reactive, and shareable. You can think of Preswald as a lightweight alternative to heavier web app platforms. It provides built in UI components and reactive…
read the full preswald overview →
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Frequently asked questions
Is BillionMail or preswald more popular?
BillionMail has 16,185 GitHub stars and preswald has 4,270. BillionMail has the larger community by that measure.
Are BillionMail and preswald free?
Both are open source. BillionMail is licensed under AGPL-3.0 and preswald under Apache-2.0. Neither carries a licence fee.
What is the difference between BillionMail and preswald?
BillionMail 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, BillionMail or preswald?
Choose BillionMail if you want the larger community (16,185 stars) or its AGPL-3.0 licence terms. Choose preswald if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.