AppSignal

AppSignal, founded in 2012 by Roy Tomeij, Thijs Cadier, Wes Oudshoorn, and Robert Beekman, is a bootstrapped, independent Application Performance Monitoring platform (Amsterdam-based) built specifically for small-to-midsize engineering teams, processing 500+ billion requests monthly. It consolidates error tracking with full stack traces, nanosecond-precision performance monitoring, host/server metrics, anomaly detection with configurable alerts, real-time uptime monitoring, log management, and background-job monitoring into one interface — an alternative to stitching together several separate observability tools. An MCP Server enables AI-assisted workflows with Claude, Cursor, and Zed for automated fix suggestions. Pricing is transparent and usage-based: a free plan covers 50,000 requests/month with no credit card required, and paid plans start at $25/month scaling with usage — every feature is included on every plan, with unlimited users, teams, and applications. Good fit for a small-to-midsize engineering team that wants error tracking, performance monitoring, and logs consolidated in one affordable tool, with genuinely all features unlocked at every tier rather than gated behind higher plans.