Skill comparison
Compare agent skills before installing.
Comparing 4 skills
Use this as a shortlist, then open the skill detail page before adopting.
Decision summary
Mailspring is the strongest overall pick here because it has a 100/100 readiness score and fits Workflow automation.
Strongest overall
Mailspring
Use this as a leading candidate, then validate the README and install path in your own agent stack.
Fastest prototype
Mailspring
Best first install candidate based on install readiness and adoption.
Freshest repo
Mailspring
Most recent maintenance signal among this shortlist.
| Signal | Gatsby Mail A Gatsby email *application* | Cloud Mail A Cloudflare-based email service | 基于 Cloudflare 的邮箱服务 | Cloudflare Email 邮箱 Mail | Mailspring :love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux. | BillionMail BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr |
|---|---|---|---|---|
| Quality | 53/100 Needs review | 100/100 Excellent | 100/100 Excellent | 100/100 Excellent |
| Decision verdict | 43/100 Needs manual review Do a manual repository review before adding this to an agent workflow. | 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 | 457 stars 0 installs | 11K stars 0 installs | 18K stars 0 installs | 15K stars 0 installs |
| Freshness | May 27, 2021 | Jun 9, 2026 | Jun 15, 2026 | Jun 11, 2026 |
| Use-case fit | ||||
| Stack fit | ||||
| Platform hints | HTML, Email, Claude Code | JavaScript, Email, Claude Code | JavaScript, Email, Claude Code | Go, Email, Claude Code |
| Warnings | Repository looks stale · 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 · builders willing to evaluate younger projects | 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 require actively maintained dependencies · production agents without a repository 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 DSchau/gatsby-mail | $ npx skills add maillab/cloud-mail | $ npx skills add Foundry376/Mailspring | $ npx skills add Billionmail/BillionMail |