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Grafana Loki vs OpenSearch

Grafana Loki: Label-indexed log aggregation: Prometheus-style streams, chunks on object storage, LogQL queries. OpenSearch: Apache-licensed, foundation-governed fork of Elasticsearch for search, vectors and observability.

key differences

  • Grafana Loki is primarily a time-series database; OpenSearch is search engine.
  • Licensing: Grafana Loki is open source (copyleft) (GNU AGPL v3.0); OpenSearch is open source (permissive) (Apache License 2.0).
  • Transactions: Grafana Loki offers none ACID; OpenSearch offers limited.
  • Only Grafana Loki has ttl / expiry.
  • Only OpenSearch has secondary indexes, full-text search, vector search, geospatial, encryption at rest.

choose grafana-loki for

  • +Kubernetes and application logs alongside Prometheus
  • +Cost-efficient log retention on S3
  • +Deriving metrics and alerts from log lines
  • +Correlating logs with traces in Grafana

best at · Observability, Time-series

choose opensearch for

  • +Log analytics and observability
  • +Application and e-commerce search
  • +Vector and hybrid search for RAG on AWS
  • +Security event analytics

best at · Search, Vector search, RAG

Grafana LokiLabel-indexed log aggregation: Prometheus-style streams, chunks on object storage, LogQL queries.
OpenSearchApache-licensed, foundation-governed fork of Elasticsearch for search, vectors and observability.
overview
Primary model
Time-Series
Search Engine
Also supports
–
Document, Vector, Spatial, Time-Series
Type
Database engine
Database engine
Status
Active
Active
Developer
Grafana Labs
OpenSearch Software Foundation (Linux Foundation)
First release
2018
2021
Latest version
3.7.9 (Oct 20, 2026)
3.9.0 (Sep 29, 2026)
License
Open source (copyleft)GNU AGPL v3.0
Open source (permissive)Apache License 2.0
Free tier
✓
✓
popularity
WhichDB Score
28.7
56.6
Rank
#96
#18
GitHub stars
29.1K
13.9K
Stack Overflow questions
643
1.1K
scale & guarantees
Comfortable data size
Massive (Multi-PB)
Massive (Multi-PB)
Horizontal scaling
Native
Native
Multi-region
None
Read replicas
ACID
None
Limited
Consistency
Eventual
Eventual
Schema
Schemaless
Flexible
Architecture
Single node, Distributed, Shared storage
Distributed, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
—
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
AWS, Google Cloud, Azure
AWS, Oracle Cloud, Aiven, DigitalOcean
capabilities
Transactions
—
—
Joins
—
—
Secondary indexes
—
✓
Full-text search
—
✓
Vector search
—
✓
Geospatial
—
✓
JSON
✓
✓
Change data capture
—
—
Triggers
—
—
Stored procedures
—
—
Materialized views
—
—
TTL / expiry
✓
—
Pub/Sub
—
—
Columnar storage
—
—
In-memory
—
—
Durable persistence
✓
✓
Compression
✓
✓
Encryption at rest
—
✓
Role-based access
—
✓
Time travel
—
—
Branching
—
—
Online schema changes
—
✓
Streaming ingest
✓
✓
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
LogQL
Query DSL, PPL, SQL
Client languages
–
Java, Python, JavaScript, Go, .NET, Ruby, PHP, Rust
Best for
Observability, Time-series
Search, Vector search, RAG, Observability
Add more to this comparisonNot sure either fits? Try smart match

Grafana Loki vs OpenSearch: FAQ

What is the difference between Grafana Loki and OpenSearch?

Grafana Loki: Label-indexed log aggregation: Prometheus-style streams, chunks on object storage, LogQL queries. OpenSearch: Apache-licensed, foundation-governed fork of Elasticsearch for search, vectors and observability. Grafana Loki is primarily a time-series database; OpenSearch is search engine. Licensing: Grafana Loki is open source (copyleft) (GNU AGPL v3.0); OpenSearch is open source (permissive) (Apache License 2.0). Transactions: Grafana Loki offers none ACID; OpenSearch offers limited.

When should I choose Grafana Loki over OpenSearch?

Choose Grafana Loki for kubernetes and application logs alongside Prometheus; cost-efficient log retention on S3; and deriving metrics and alerts from log lines. Choose OpenSearch for log analytics and observability; application and e-commerce search; and vector and hybrid search for RAG on AWS.

Is Grafana Loki or OpenSearch more popular?

OpenSearch ranks #18 on the WhichDB Score (56.6/100) and Grafana Loki ranks #96 (28.7/100). Popularity is not fit: check the requirements that matter for your project.

Are Grafana Loki and OpenSearch open source?

Yes. Grafana Loki is open source. License: GNU AGPL v3.0. Yes. OpenSearch is open source. License: Apache License 2.0.