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CnosDB vs GreptimeDB

CnosDB: Rust cloud-native time-series database with SQL on DataFusion and InfluxDB-style ingestion. GreptimeDB: Rust observability database that keeps metrics, logs and traces in one columnar engine on object storage.

key differences

  • Licensing: CnosDB is open source (copyleft) (GNU AGPL v3.0); GreptimeDB is open source (permissive) (Apache License 2.0).
  • Only CnosDB has role-based access.
  • Only GreptimeDB has secondary indexes, full-text search, json, materialized views.
  • GreptimeDB has a serverless option; CnosDB does not.

choose cnosdb for

  • +Energy and utility telemetry
  • +IoT platforms needing multi-tenancy
  • +Replacing InfluxDB 1.x with a SQL-capable engine

best at · Time-series, IoT, Observability

choose greptimedb for

  • +Unified observability backend for metrics, logs and traces
  • +Prometheus long-term storage on S3
  • +IoT and connected-vehicle telemetry
  • +Edge data collection synced to the cloud

best at · Observability, Time-series, IoT

CnosDBRust cloud-native time-series database with SQL on DataFusion and InfluxDB-style ingestion.
GreptimeDBRust observability database that keeps metrics, logs and traces in one columnar engine on object storage.
overview
Primary model
Time-Series
Time-Series
Also supports
Columnar / OLAP
Columnar / OLAP, Search Engine
Type
Database engine
Database engine
Status
Active
Active
Developer
CnosDB
Greptime
First release
2022
2022
Latest version
2.5.0 (Oct 23, 2026)
1.2.1 (Sep 16, 2026)
License
Open source (copyleft)GNU AGPL v3.0
Open source (permissive)Apache License 2.0
Free tier
✓
✓
popularity
WhichDB Score
6.7
15.1
Rank
#354
#221
GitHub stars
1.8K
6.8K
Stack Overflow questions
–
–
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Large (≤ 1 PB)
Horizontal scaling
Native
Native
Multi-region
None
None
ACID
None
None
Consistency
Eventual
Strong
Schema
Flexible
Flexible
Architecture
Single node, Distributed, Client server
Single node, Distributed, Shared storage
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
✓
Serverless
—
✓
Embedded
—
—
Edge
—
✓
Clouds
–
AWS
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
SQL
SQL, PromQL
Client languages
Go, Java, Python, Rust
Go, Java, Rust, JavaScript
Best for
Time-series, IoT, Observability
Observability, Time-series, IoT, Real-time analytics
Add more to this comparisonNot sure either fits? Try smart match

CnosDB vs GreptimeDB: FAQ

What is the difference between CnosDB and GreptimeDB?

CnosDB: Rust cloud-native time-series database with SQL on DataFusion and InfluxDB-style ingestion. GreptimeDB: Rust observability database that keeps metrics, logs and traces in one columnar engine on object storage. Licensing: CnosDB is open source (copyleft) (GNU AGPL v3.0); GreptimeDB is open source (permissive) (Apache License 2.0). Only CnosDB has role-based access. Only GreptimeDB has secondary indexes, full-text search, json, materialized views.

When should I choose CnosDB over GreptimeDB?

Choose CnosDB for energy and utility telemetry; IoT platforms needing multi-tenancy; and replacing InfluxDB 1.x with a SQL-capable engine. Choose GreptimeDB for unified observability backend for metrics, logs and traces; prometheus long-term storage on S3; and IoT and connected-vehicle telemetry.

Is CnosDB or GreptimeDB more popular?

GreptimeDB ranks #221 on the WhichDB Score (15.1/100) and CnosDB ranks #354 (6.7/100). Popularity is not fit: check the requirements that matter for your project.

Are CnosDB and GreptimeDB open source?

Yes. CnosDB is open source. License: GNU AGPL v3.0. Yes. GreptimeDB is open source. License: Apache License 2.0.