head to head · open source
Fluxer vs certspotter
Fluxer has 10,765 GitHub stars, 849 forks, 111 open issues and last shipped yesterday. certspotter has 1,197 stars, 104 forks, 18 open issues and last shipped 7 days ago. Fluxer leads on adoption by 799% (10,765 vs 1,197 stars). Fluxer is written in TypeScript under AGPL-3.0; certspotter is written in Go under MPL-2.0. Fluxer has attracted 8% as many forks as stars, certspotter 9%. Fluxer 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
| Fluxer | certspotter | |
|---|---|---|
| GitHub stars | ★ 11K | ★ 1.2K |
| License | AGPL-3.0 | MPL-2.0 |
| Written in | TypeScript | Go |
| Last push | 2026-11-04 | 2026-10-29 |
| Forks | ⑂ 849 | ⑂ 104 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Fluxer if
- You weight community size — 11K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick certspotter if
- You want the certspotter feature set and don't need the biggest community
- You prefer the MPL-2.0 license terms
- Your stack matches Go
- You evaluated both and certspotter fits your workflow better
About Fluxer
Fluxer Fluxer is a free and open source instant messaging and VoIP chat app built for friends, groups, and communities.
read the full Fluxer overview →
About certspotter
Cert Spotter Certificate Transparency Monitor Open Source Edition Cert Spotter is a Certificate Transparency log monitor from SSLMate that alerts you when an SSL/TLS certificate is issued for one of your domains. Cert Spotter is easier to use than other open source CT monitors, since it does not require a database. It's also more robust, since it uses a special certificate parser that ensures it won't miss certificates. Cert Spotter is available as a hosted service by SSLMate that also provides monitoring for expiring and incorrectly installed certificates, Slack notifications, and a Web dashboard for tracking…
read the full certspotter overview →
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Frequently asked questions
Is Fluxer or certspotter more popular?
Fluxer has 10,765 GitHub stars and certspotter has 1,197. Fluxer has the larger community by that measure.
Are Fluxer and certspotter free?
Both are open source. Fluxer is licensed under AGPL-3.0 and certspotter under MPL-2.0. Neither carries a licence fee.
What is the difference between Fluxer and certspotter?
Fluxer is written in TypeScript and certspotter 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, Fluxer or certspotter?
Choose Fluxer if you want the larger community (10,765 stars) or its AGPL-3.0 licence terms. Choose certspotter if its feature set, stack or MPL-2.0 licence fits better. Both are self-hostable.