Inbox Zero Mail is an open-source email client for Gmail and Outlook. Fast, keyboard-first, and free to use, on web, Mac, Windows and iPhone, with all your accounts in one inbox. Add AI for $20/mo: every email is sorted, and replies are drafted in your voice before you open them. Comment privately with your team, get Slack alerts, and give the AI context from your tools.
痛点：邮箱收件箱过载，用户希望以键盘优先的方式快速处理邮件，并让 AI 自动分拣邮件、按用户语气代写回复。
目标用户：Gmail/Outlook 高频使用的创业者、销售、顾问和需要团队协作处理邮件的知识工作者。
证据：Add AI for $20/mo: every email is sorted, and replies are drafted in your voice before you open them. Comment privately with your team, get Slack alerts, and give the AI context from your tools.
变现：采用开源客户端免费获客，AI 功能订阅 $20/月，团队协作/Slack 集成作为更高价套餐。
MVP：不做完整跨平台邮件客户端，先做 Gmail 插件或轻量 Web 应用：接入 Gmail API，提供 AI 收件箱分拣、按语气生成回复草稿、每日摘要，按月订阅收费。
竞品：Superhuman、Shortwave、SaneBox、Gmail Gemini、Inbox Zero
摘要：Product Hunt 上线了开源邮件客户端 Inbox Zero，支持 Gmail/Outlook、多平台和键盘优先操作，免费使用；AI 分拣与代写回复定价 $20/月。该帖子仅 0 票，付费需求未被验证，且完整邮件客户端对独立开发者实现难度高、竞争激烈。