Top Open Source Data Observability Tools in 2026
A curated collection of the 21 best free and open-source Data Observability tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.
OpenLLMetry
Open-source observability for LLMs with OpenTelemetry
Stars7,402Last commit27d agoLicenseApache-2.0SurfSense
Open-source NotebookLM alternative for live web research
Stars16,022Last commit13d agoLicenseOpen SourceSpanlens
Open source LLM observability & monitoring
Stars12Last commit16d agoLicenseMIT
Open Wearables
Open-source health intelligence platform for wearable data
Stars2,408Last commit10d agoLicenseMITLaminar
Open-source AI agent observability platform
Stars3,199Last commit12d agoLicenseApache-2.0
Elementary Data
Unified data reliability platform for AI era
Stars2,399Last commit19d agoLicenseApache-2.0WunderGraph
Open-source GraphQL Federation platform with governance
Stars1,256Last commit11d agoLicenseApache-2.0Weaviate
Open-source vector database for AI-native apps
Stars16,754Last commit10d agoLicenseBSD-3-Clause
Uptrace
OpenTelemetry-native observability platform
Stars4,270Last commit2mo agoLicenseAGPL-3.0Rowy
Low-code backend for Firebase & Google Cloud
Stars6,833Last commit21mo agoLicenseOpen Source
Logfire
AI observability platform for LLMs and apps
Stars4,442Last commit11d agoLicenseMIT
PostHog
Self-driving product analytics platform
Stars39,294Last commit10d agoLicenseOpen Source
OpenObserve
Open source observability platform for AI era
Stars21,502Last commit10d agoLicenseAGPL-3.0
OneUptime
Open-source observability & incident management
Stars7,523Last commit10d agoLicenseApache-2.0
mlop
Open source MLOps experiment tracking platform
Stars392Last commit6mo agoLicenseApache-2.0
