head to head · open source
BillionMail vs ktx
BillionMail has 16,185 GitHub stars, 1,803 forks, 239 open issues and last shipped 5 months ago. ktx has 1,628 stars, 111 forks, 52 open issues and last shipped 14 days ago. BillionMail leads on adoption by 894% (16,185 vs 1,628 stars). BillionMail is written in Go under AGPL-3.0; ktx is written in TypeScript under Apache-2.0. BillionMail has attracted 11% as many forks as stars, ktx 7%. ktx 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 | ktx | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 1.6K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Go | TypeScript |
| Last push | 2026-06-11 | 2026-10-22 |
| Forks | ⑂ 1.8K | ⑂ 111 |
| 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 ktx if
- You want the ktx feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and ktx 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 ktx
The context layer for data agents Quickstart · CLI Reference · Agent Setup · Slack Built and maintained by Kaelio ktx is a self improving context layer that teaches agents how to query your warehouse accurately from approved metric definitions, joinable columns, and business knowledge it builds and maintains for you. [!NOTE] Run ktx with your own LLM API keys or a local agent sign in — a Claude Pro/Max subscription through Claude Code, or your local Codex authentication. No extra usage billing from ktx . Why ktx General purpose agents struggle on data tasks. They re explore your warehouse on every question…
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Frequently asked questions
Is BillionMail or ktx more popular?
BillionMail has 16,185 GitHub stars and ktx has 1,628. BillionMail has the larger community by that measure.
Are BillionMail and ktx free?
Both are open source. BillionMail is licensed under AGPL-3.0 and ktx under Apache-2.0. Neither carries a licence fee.
What is the difference between BillionMail and ktx?
BillionMail is written in Go and ktx in TypeScript. 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 ktx?
Choose BillionMail if you want the larger community (16,185 stars) or its AGPL-3.0 licence terms. Choose ktx if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.