If you're looking for a different Inspector alternative, Airbrake is a good choice. It offers real-time alerts and error tracking, letting you see how errors are related to deployments so you can improve your code. It supports multiple programming languages and integrates with GitHub, Slack and other tools, so it's a good choice for error monitoring and performance monitoring.
If you're interested in a more specialized Node.js focus, N|Solid is worth a look. It offers real-time visibility into Node.js app performance and security, including an AI-powered Node.js copilot and observability tools. N|Solid is designed for high-traffic environments and offers a variety of pricing tiers, including on-premises options.
Last, Datadog is an all-purpose monitoring and security tool that offers real-time insights into performance, security and user experience across many stacks and infrastructure. With its broad feature set and integrations, Datadog is a good choice for companies that want to monitor and optimize their entire technology stack.