33 Best Open Source Datadog Alternatives in 2026

Netdata is a real-time monitoring tool with per-second metrics, zero-configuration dashboards, intelligent alerting, and extensibility for servers, containers, and distributed systems.

Pricing: Free and open source agent; paid cloud and enterprise plans for centralized features.

• Zero-configuration real-time dashboards
• Wide auto-discovery of services
• Very active community
• Centralized features and retention may need paid cloud plans
• Less flexible for custom long-term analytics than Prometheus

Grafana is an AGPL-3.0 visualization platform for metrics, logs, traces, SQL data, alerts, variables, plugins, and embedded dashboards. It can also display business data but is not a complete Power BI replacement.

Pricing: Open-source core is self-hostable; enterprise and hosted offerings may be paid.

• Real-time dashboards
• Metrics, logs, traces, and alerting
• Large datasource and plugin ecosystem
• Primarily observability-focused
• Less suited to traditional corporate reporting
• Semantic modeling is less central

Prometheus is a CNCF graduated monitoring system with a multi-dimensional data model, PromQL queries, built-in alerting, service discovery, and a local time series database, and it is the de facto metrics standard for Kubernetes.

Pricing: Free and open source.

• Industry standard for cloud-native metrics
• PromQL, alerting, and service discovery
• Huge ecosystem of exporters
• Metrics only: logs and traces need other tools
• No built-in long-term storage or UI beyond basics

Sentry offers error tracking with stack traces, performance monitoring, release management, and many SDKs. The code is source available under the Functional Source License (FSL-1.1-Apache-2.0), which converts to Apache-2.0 after two years, and Sentry can be self-hosted or used as a hosted service.

Pricing: Free self-hosted use; hosted free tier and paid plans.

• Mature error tracking and performance monitoring
• SDKs for most languages
• Self-hostable
• Source available, not OSI-approved open source
• Self-hosting is resource heavy

SigNoz is an all-in-one observability platform for microservices that combines metrics, distributed tracing, and logs with dashboards and alerts, built on OpenTelemetry. The repository is MIT outside its ee directories, which are under a separate license.

Pricing: Free self-hosted community edition; paid cloud and enterprise plans.

• Metrics, traces, and logs in one OpenTelemetry-based tool
• Active development
• Lower cost than proprietary APM
• Open core with enterprise features under a separate license
• Needs resources to operate at scale

ProjectDiscovery builds open-source security tools such as Nuclei, a template-based vulnerability scanner, alongside a hosted platform for asset discovery and vulnerability management. It covers security scanning rather than application performance monitoring.

Pricing: Free open-source tools; the hosted platform is paid.

• Template-based vulnerability scanning with Nuclei
• Large community of templates
• MIT-licensed core tools
• Security tooling, not infrastructure or APM monitoring
• The managed platform is a separate hosted service

Grafana Loki is a log aggregation system that indexes labels instead of full text, uses object storage, and offers LogQL queries, alerting, and multi-tenancy for cloud-native and Kubernetes environments.

Pricing: Free self-hosted; managed and enterprise tiers available.

• Low-cost log storage on object storage
• Tight integration with Grafana
• LogQL and multi-tenancy
• No full-text indexing, so some searches are slower
• AGPL-3.0 license

Apache SkyWalking provides distributed tracing, metrics, logs, and profiling with eBPF support, alerting, RBAC, and agents for many languages, aimed at complex cloud-native systems and microservices.

Pricing: Free and open source.

• Tracing, metrics, logs, and profiling in one
• Agents for 10+ languages and eBPF
• Apache Software Foundation project
• Complex to operate
• Interface less polished than commercial APMs

Vector is a Rust-built pipeline that collects, transforms, and routes logs and metrics, with 47 sources, 62 sinks, and 18 transforms, programmable transforms, and clear delivery guarantees. It can run as an agent, aggregator, or stream topology.

Pricing: Free and open source.

• Fast and vendor-neutral routing
• Many sources, sinks, and transforms
• Strong delivery guarantees
• Pipeline only: no storage or dashboards
• Configuration learning curve

OpenObserve is a Rust-built observability platform for logs, metrics, and traces with columnar storage, high compression, a stateless architecture, and OpenTelemetry compatibility, using object storage such as S3, GCS, or Azure Blob to reduce cost.

Pricing: Free self-hosted; hosted and enterprise plans available.

• Very low storage cost with high compression
• Logs, metrics, and traces in one tool
• OpenTelemetry compatible
• AGPL-3.0 license
• Younger than Grafana-based stacks

VictoriaMetrics is a fast, cost-effective time series database compatible with Prometheus, with MetricsQL, long-term retention, high-cardinality handling, OpenTelemetry support, and single-binary or cluster deployment. An enterprise tier adds extra features.

Pricing: Free open source; paid enterprise tier.

• Efficient storage and high cardinality
• Drop-in Prometheus compatibility
• Single-binary simplicity or clustering
• Metrics-focused
• Some features are enterprise only

Logstash ingests data from many sources, transforms it with grok patterns and 200+ plugins, and routes it to destinations, and it integrates with the Elastic Stack. Source code is Apache-2.0 outside the x-pack folder, which is under the Elastic License.

Pricing: Free; Elastic subscriptions add commercial features.

• 200+ plugins and flexible outputs
• Persistent queues for reliability
• Mature Elastic Stack integration
• Resource heavy compared with Vector
• Mixed licensing between Apache and Elastic License

HyperDX is an observability platform that unifies session replays, logs, traces, metrics, and errors on ClickHouse with fast search and OpenTelemetry support. It is now part of ClickHouse's observability offering.

Pricing: Free self-hosted; hosted plans are paid.

• End-to-end correlation from session replay to logs and traces
• Fast ClickHouse-powered search
• MIT license
• Depends on ClickHouse
• Now tied to ClickHouse's product direction

Highlight is a monitoring platform with error tracking, session replay, performance insights, real-time alerts, and PII redaction for web applications. The repository is Apache-2.0 outside its enterprise directories.

Pricing: Free tier and tiered paid plans; self-hostable.

• Session replay with error tracking
• Apache-2.0 core
• Privacy features including PII redaction
• Open core with enterprise directories
• Last commit in August 2026

OpenStatus is an open-source status page and uptime monitor that checks endpoints from 28 global regions, with incident communication, custom domains, maintenance windows, and Terraform, CLI, and API support. It can be self-hosted with Docker.

Pricing: Free plan with limits; paid plans from $30 per month; self-hostable.

• Global multi-region monitoring
• Status pages and incident communication
• Terraform, CLI, and API support
• Free hosted plan is limited
• AGPL-3.0 license

OneUptime is an all-in-one platform for monitoring, alerting, incident management, and status pages. The repository is Apache-2.0 outside its ee directory, which is under the OneUptime Enterprise License.

Pricing: Free self-hosted with limits; paid plans available.

• Monitoring, incidents, and status pages together
• Self-hostable
• Active development
• Open core with an enterprise license directory
• Broad scope can be heavy to run

OpenLLMetry provides OpenTelemetry instrumentation for LLM applications, tracking performance, cost, and errors across providers with request tracing and quick integration.

Pricing: Free open-source instrumentation; the Traceloop platform is a separate service.

• Standard OpenTelemetry instrumentation for LLMs
• Works with many providers and backends
• Apache-2.0 license
• Instrumentation rather than a complete monitoring product
• Needs a separate backend to view data

GreptimeDB is a cloud-native observability database unifying metrics, logs, and traces with SQL, PromQL, and streaming support, sub-second queries, OpenTelemetry-native ingestion, and deployment from ARM edge devices to the cloud.

Pricing: Free open source; managed cloud pricing available.

• Unified storage for all telemetry signals
• SQL and PromQL queries
• Efficient at petabyte scale
• A database, not a full monitoring UI
• Younger ecosystem

Zabbix is a full-scale monitoring platform for networks, servers, cloud, and IoT with automated discovery, webhooks, multi-tenancy, log monitoring, and real-time alerting, without per-device licensing.

Pricing: Free; fixed-cost commercial support available.

• Proven at large enterprise scale
• Automated discovery and templates
• No per-device fees
• Traditional agent-and-template model
• Less suited to modern tracing and logs

Helicone is an open-source platform for logging, monitoring, and debugging LLM applications, with integrations for 100+ models, analytics, a prompt playground, experiments, evaluators, and datasets. It can be self-hosted or used in the cloud.

Pricing: Free tier; paid cloud plans; self-hostable.

• Broad model integrations
• Analytics, prompt tools, and evaluators
• Apache-2.0 license
• LLM-specific
• Cloud features are paid

Kener is an open-source status page and uptime monitor with Docker deployment, 11 service types, incident management, scheduled maintenance, and subscriber notifications.

Pricing: Free and open source.

• Simple Docker deployment
• Incidents, maintenance, and subscriber notifications
• MIT license
• Status pages only
• Smaller project

Pydantic Logfire is an observability platform for logs, traces, and profiling with strong Python integration and OpenTelemetry support. The repository contains the open-source SDK and documentation, while the server application is closed source and offered as a hosted service.

Pricing: SDK is free; the hosted platform has its own pricing.

• Excellent Python and OpenTelemetry integration
• Structured, readable traces
• MIT-licensed SDK
• The server is closed source and not self-hostable
• Not a full open-source alternative

Uptrace is an open-source APM that integrates traces, metrics, and logs through OpenTelemetry, with a service graph, RED metrics, and support for many languages. It can be self-hosted or used as a managed cloud.

Pricing: Free self-hosted; cloud has a free tier and pay-per-usage plans.

• All-in-one OpenTelemetry APM
• Service graph and RED metrics
• Vendor-agnostic
• AGPL-3.0 license
• Smaller community than SigNoz or Grafana

Tianji is a self-hostable platform combining cookieless web analytics, uptime monitoring, server and Docker status, status pages, telemetry, and surveys, with an OpenAPI interface.

Pricing: Free and open source.

• Analytics and monitoring in one lightweight tool
• GDPR-friendly cookieless analytics
• Apache-2.0 license
• Not a deep observability platform
• Smaller community

Checkmk is IT infrastructure monitoring with 2,000+ plugins, automated discovery and configuration, granular alerting, and dashboards. The Raw Edition is open source, and Enterprise, Cloud, and MSP editions are commercial.

Pricing: Free Raw Edition; paid Enterprise, Cloud, and MSP editions.

• 2,000+ vendor plugins and automated discovery
• High-performance core
• Strong for large infrastructures
• Some features are limited to paid editions
• Traditional monitoring model

Icinga is a monitoring platform with real-time checks, custom check configurations, fast alerting, multi-tenancy, and high availability for on-premises, cloud, and hybrid environments.

Pricing: Free; commercial support available.

• Flexible checks and high availability
• Scales to complex environments
• Active community
• Configuration-heavy
• Dated compared with modern observability stacks

Bugsink is a self-hosted error tracking tool compatible with Sentry SDKs, with real-time error details and scalable performance. It is source available under the PolyForm Shield License, which restricts offering it as a competing service.

Pricing: Free to self-host.

• Works with existing Sentry SDKs
• Lightweight self-hosting
• Actively maintained
• Source available, not standard open source
• Error tracking only

Nagios Core is a long-established monitoring system for servers, networks, and applications with a powerful plugin architecture, official plugins, and hundreds of community add-ons.

Pricing: Free and open source; commercial editions are separate.

• 25+ years of heritage and a huge plugin ecosystem
• Cross-platform agents
• Free core
• Aging interface and configuration model
• Not designed for tracing or modern observability

Maple is an observability platform built on OpenTelemetry and ClickHouse for traces, logs, and metrics, with session replay, service maps, error tracking, alerting, and an MCP server for AI agent diagnostics. It is licensed under FSL-1.1, which converts to Apache-2.0 two years after each release.

Pricing: Free local mode in a single binary; hosted plan from $39 per month.

• Single binary for local use with embedded ClickHouse
• MCP server for AI agents
• Traces, logs, metrics, and session replay
• Source available, not OSI-approved open source
• Young project

Gigapipe is a unified observability platform for logs, metrics, traces, and profiles, compatible with OpenTelemetry, Loki, Prometheus, and Tempo, built on OLAP engines and NVMe storage with flat-cost pricing.

Pricing: Free self-hosted; flat-cost commercial offering.

• Compatible with Loki, Prometheus, Tempo, and OpenTelemetry
• All signals in one store
• Avoids data silos
• AGPL-3.0 license
• Smaller community

Statusnook is an open-source status page system with real-time updates, incident management, maintenance scheduling, brand customization, notifications, and endpoint monitoring, deployable in minutes.

Pricing: Free and open source.

• Quick deployment
• Incidents, maintenance, and monitoring in one
• MIT license
• No commits since October 2024
• Status pages only

GlitchTip is a self-hostable error tracking tool compatible with Sentry SDKs, with performance monitoring, uptime monitoring, logs, and email and webhook alerts. Development happens on GitLab.

Pricing: Free self-hosted; hosted plans with a free tier.

• Sentry SDK compatible with a lighter footprint
• MIT license
• Error, performance, and uptime monitoring
• Smaller feature set than Sentry
• Development is on GitLab, so GitHub metrics do not apply

Wachd is an alert intelligence and on-call platform with AI-generated root cause analysis, flexible on-call scheduling, per-user notification rules, PII sanitization, and multi-tenant isolation. It runs self-hosted on Kubernetes, including air-gapped setups.

Pricing: Free and open source; paid cloud and enterprise tiers.

• AI root cause analysis with on-call scheduling
• Air-gapped self-hosting on Kubernetes
• Apache-2.0 license
• Very small and new project
• Not a monitoring data store