head to head · open source
BillionMail vs roapi
BillionMail has 16,185 GitHub stars, 1,803 forks, 239 open issues and last shipped 5 months ago. roapi has 3,435 stars, 211 forks, 66 open issues and last shipped 8 months ago. BillionMail leads on adoption by 371% (16,185 vs 3,435 stars). BillionMail is written in Go under AGPL-3.0; roapi is written in Rust under Apache-2.0. BillionMail has attracted 11% as many forks as stars, roapi 6%. BillionMail 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 | roapi | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 3.4K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Go | Rust |
| Last push | 2026-06-11 | 2026-03-25 |
| Forks | ⑂ 1.8K | ⑂ 211 |
| 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 roapi if
- You want the roapi feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and roapi 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 roapi
ROAPI ROAPI automatically spins up read only APIs for static datasets without requiring you to write a single line of code. It builds on top of Apache Arrow and Datafusion. The core of its design can be boiled down to the following: Query frontends to translate SQL, FlightSQL, GraphQL and REST API queries into Datafusion plans. Datafusion for query plan execution. Data layer to load datasets from a variety of sources and formats with automatic schema inference. Response encoding layer to serialize intermediate Arrow record batch into various formats requested by client. See below for a high level diagram…
read the full roapi overview →
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Frequently asked questions
Is BillionMail or roapi more popular?
BillionMail has 16,185 GitHub stars and roapi has 3,435. BillionMail has the larger community by that measure.
Are BillionMail and roapi free?
Both are open source. BillionMail is licensed under AGPL-3.0 and roapi under Apache-2.0. Neither carries a licence fee.
What is the difference between BillionMail and roapi?
BillionMail is written in Go and roapi in Rust. 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 roapi?
Choose BillionMail if you want the larger community (16,185 stars) or its AGPL-3.0 licence terms. Choose roapi if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.