Skill comparison
Compare agent skills before installing.
Put high-signal skills side by side and inspect quality, adoption, freshness, install readiness, use-case fit, and warnings in one place.
Comparing 4 skills
Use this as a shortlist, then open the skill detail page before adopting.
Decision summary
Novu is the strongest overall pick here because it has a 100/100 readiness score and fits Workflow automation.
Strongest overall
Novu
Use this as a leading candidate, then validate the README and install path in your own agent stack.
Fastest prototype
Novu
Best first install candidate based on install readiness and adoption.
Freshest repo
Novu
Most recent maintenance signal among this shortlist.
| Signal | Novu The open-source communication infrastructure for agents and products | Inbox Modern email for teams and professionals. A replacement for outdated email technology and tools. Alt to hey.com, front.com, missiveapp.com | Thunderbird Android Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail) | Alertmanager Prometheus Alertmanager |
|---|---|---|---|---|
| Quality | 100/100 Excellent | 89/100 Excellent | 100/100 Excellent | 100/100 Excellent |
| Decision verdict | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. |
| Adoption | 39K stars 0 installs | 1.7K stars 0 installs | 14K stars 0 installs | 8.5K stars 0 installs |
| Freshness | Jun 16, 2026 | Feb 11, 2026 | Jun 16, 2026 | Jun 16, 2026 |
| Use-case fit | ||||
| Stack fit | ||||
| Platform hints | TypeScript, Email, Claude Code | TypeScript, Email, Claude Code | Kotlin, Email, Claude Code | Go, Email, Claude Code |
| Warnings | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet |
| Best for | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals |
| Not ideal for | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review |
| OpenAgentSkill engagement | 0 views 0 install copies | 0 views 0 install copies | 0 views 0 install copies | 0 views 0 install copies |
| Install | $ npx skills add novuhq/novu | $ npx skills add un/inbox | $ npx skills add thunderbird/thunderbird-android | $ npx skills add prometheus/alertmanager |