APId is described as 'Don’t just check for 200’s, model complex customer flows and monitor their realtime performance from around the world. Get notified the instant something goes wrong' and is a Uptime Monitor in the Development category. There are more than 50 alternatives to APId for a variety of platforms, including Online / Web-based, Windows, Mac, Linux and SaaS. Most alternatives are Uptime and Website Monitors. The best alternative is Insomnia REST Client, which is both free and Open Source. Other great apps like APId are Postman (Freemium), UptimeRobot (Freemium), HTTPie (Free, Open Source) and Paw (Paid).
PHP Server Monitor is a script that checks whether your websites and servers are up and running. It comes with a web based user interface where you can manage your services and websites, and you can manage users for each server with a mobile number and email address.
A fancy self-hosted monitoring tool. Features - Monitoring uptime for HTTP(s) / TCP / Ping / DNS record / Push url. - Fancy, Reactive, Fast UI/UX. - Notifications via Webhook, Telegram, Discord and email (SMTP).
StatusCake.com is a free website monitoring tool which allows users to track up to 10 websites and get alerted when their site is down or is having trouble. Downtime root cause analysis is included in the free plan to help users diagnose and fix issues.
GitHub-powered open-source uptime monitor and status page. Monitor uptime every 5 minutes Using GitHub Actions, monitor unlimited webpages every 5 minutes, and store version-controlled response time stats.