head to head · open source
Tuta vs certspotter
Tuta has 7,925 GitHub stars, 639 forks, 1,001 open issues and last shipped yesterday. certspotter has 1,174 stars, 104 forks, 18 open issues and last shipped 7 days ago. Tuta leads on adoption by 575% (7,925 vs 1,174 stars). Tuta is written in TypeScript under GPL-3.0; certspotter is written in Go under MPL-2.0. Tuta has attracted 8% as many forks as stars, certspotter 9%. Tuta was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (security), so they are genuine substitutes rather than adjacent tools.
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
| Tuta | certspotter | |
|---|---|---|
| GitHub stars | ★ 7.9K | ★ 1.2K |
| License | GPL-3.0 | MPL-2.0 |
| Written in | TypeScript | Go |
| Last push | 2026-09-19 | 2026-09-13 |
| Forks | ⑂ 639 | ⑂ 104 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Tuta if
- You weight community size — 7.9K stars and counting
- You want the GPL-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 Tuta
Tuta is an open source, end to end encrypted email, calendar and contacts service for individuals and teams who need private communication to work across every device they own.
About certspotter
Cert Spotter is a lightweight, open source Certificate Transparency log monitor from SSLMate that watches Certificate Transparency logs and alerts you when an SSL/TLS certificate is issued for any domain on your watch list, aimed at site operators, security teams, and PKI administrators who need to catch unauthorized certificates without operating a database.
read the full certspotter overview →
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Frequently asked questions
Is Tuta or certspotter more popular?
Tuta has 7,925 GitHub stars and certspotter has 1,174. Tuta has the larger community by that measure.
Are Tuta and certspotter free?
Both are open source. Tuta is licensed under GPL-3.0 and certspotter under MPL-2.0. Neither carries a licence fee.
What is the difference between Tuta and certspotter?
Tuta 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, Tuta or certspotter?
Choose Tuta if you want the larger community (7,925 stars) or its GPL-3.0 licence terms. Choose certspotter if its feature set, stack or MPL-2.0 licence fits better. Both are self-hostable.