AppSignal vs Azure Application Insights

AppSignal is a cloud application-monitoring service for developers, with error tracking, performance monitoring, logs, and tracing. Error tracking groups exceptions with backtraces and the deployment linked to each issue. Performance monitoring covers response times, throughput, slow endpoints, and slow queries. Log management provides full-text search, attribute filters, saved queries, live tail, and pattern-based alerts. Distributed tracing, transaction tracing, and log correlation are available. AppSignal lists support for Ruby, Elixir, Node.js, JavaScript, Python, Go, Java, PHP, and Rust, with integrations including Slack, GitHub, Jira, Linear, GitLab, and PagerDuty. Its MCP server lets AI assistants such as Claude, Cursor, and Zed query production errors, traces, and deploys. The free plan costs nothing and includes 30K requests, 1GB logging, five-day retention, and unlimited users, teams, applications, and dashboards. Paid access is $279 a year, billed yearly at $23.25/month, with 250K requests per month. A 30-day full-featured trial requires no credit card. AppSignal says it does not charge overages or stop monitoring when limits are crossed.

Azure Application Insights is an Azure Monitor service for collecting and analyzing application telemetry. It combines alerts, metrics, logs, workbooks, Grafana dashboards, and investigation tools such as application maps, live metrics, transaction search, availability monitoring, failure analysis, and performance views. Usage analytics cover users, sessions, events, funnels, flows, and cohorts. For.NET applications, diagnostics include profiling and a snapshot debugger for exceptions. Microsoft recommends the Azure Monitor OpenTelemetry Distro for most code-based server-side scenarios; browser telemetry uses the Application Insights JavaScript SDK. Setup paths cover web apps, virtual machines, JavaScript apps, Azure Functions, Kubernetes, and AI agents. Telemetry is stored in a Log Analytics workspace, and the service can work with applications hosted outside Azure. A daily ingestion cap can stop excess collection until the next UTC day, while sampling can reduce volume. The pricing page lists 90 days of no-charge retention, with longer retention charged by retained data volume. Ingestion is usage-based, with the first 5 GB per month per billing account free.