I built a simple network monitoring tool because I wanted an easier way to know when devices on my network went offline. It’s called DeviceKnock. I currently use it to monitor 200+ devices on a real production network, including switches, wireless access points, servers, and other network equipment. The idea was to keep it simple: • Add the devices you want to monitor • DeviceKnock continuously checks them • Get an email when something goes offline • Get another notification when it
痛点：IT/运维人员需要一种简单、低成本、无需月费的方式来监控网络设备离线并接收邮件告警，避免复杂笨重的传统网管系统。
目标用户：IT技术员、系统管理员、MSP、管理小型企业网络的人员
证据：For larger environments, the paid version supports unlimited devices for a one-time $49.99 purchase with no monthly subscription. I currently use it to monitor 200+ devices on a real production network
变现：一次性买断 $49.99 解锁无限设备监控；可增加自托管版、品牌白标、MSP多租户、短信/Webhook告警等增值包。
MVP：2周内做一个极简SaaS：用户添加IP/域名，定时ICMP/TCP探测，离线/恢复邮件告警，免费5个设备，付费解锁无限设备，支持基础状态页和告警历史。
竞品：Uptime Kuma、UptimeRobot、Pingdom、PRTG、Zabbix、Nagios、LibreNMS、Better Stack
摘要：作者因想简单监控网络设备离线，开发了 DeviceKnock，目前在生产网络监控 200+ 台设备。免费版支持 5 台设备，付费版一次性 $49.99 支持无限设备，目标用户是 IT 技术员、系统管理员和 MSP。需求真实但竞品众多，差异化在于简单和一次性买断。