Apache SkyWalking vs Azure Application Insights

Apache SkyWalking is a free, self-hosted observability platform for cloud-native systems and AI workloads. It brings traces, metrics, logs, and profiling together to help users explore services, Kubernetes, and infrastructure through topology, telemetry, profiles, and alerts. For AI workloads, users can inspect model and MCP call latency and token rates, and review agent conversations, tool calls, and recorded file changes. The project lists agents for Java, Python, NodeJS, Go, Rust, PHP, Ruby, Nginx LUA, Kong, and client-side JavaScript. Its integrations and ecosystem include OpenTelemetry OTLP, Istio, Envoy, Kubernetes, Grafana, and MCP. BanyanDB is described as a database for ingesting, analyzing, and storing observability data. Docker installation instructions cover Linux, macOS, WSL, and Windows PowerShell. Horizon UI supports SkyWalking natively since v11 and partially for v10. Its security documentation covers Content-Security-Policy, strict session cookies, no-store API responses, and optional login auditing. Apache source releases are official artifacts, with PGP or SHA512 verification recommended; the GraalVM distribution is marked experimental.

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.