DuckDB vs Sail

DuckDB: In-process columnar SQL database: the SQLite of analytics, running inside your app or notebook. Sail: Rust-native, Spark Connect-compatible engine for SQL, DataFrame and streaming jobs without the JVM.

key differences

DuckDB is primarily a columnar / OLAP database; Sail is relational.
Sail is built for larger datasets (≤ 1 PB) than DuckDB (≤ 10 TB).
Horizontal scaling is none in DuckDB and native in Sail.
Transactions: DuckDB offers full ACID; Sail offers limited.
Only DuckDB has transactions, secondary indexes, full-text search, vector search, geospatial.
Only Sail has streaming ingest.
DuckDB can run embedded in your application process.

choose duckdb for

+Local data analysis in notebooks
+ETL and data-engineering pipelines on files
+Embedded analytics inside applications
+Querying data lakes on S3 without a cluster

best at · OLAP, Embedded, Lakehouse

choose sail for

+Cutting cost of PySpark ETL
+Local Spark development without a JVM
+Lakehouse batch jobs on Delta/Iceberg

best at · Lakehouse, OLAP, Streaming

DuckDBIn-process columnar SQL database: the SQLite of analytics, running inside your app or notebook.

SailRust-native, Spark Connect-compatible engine for SQL, DataFrame and streaming jobs without the JVM.

overview

Primary model

Columnar / OLAP

Relational

Also supports

Relational, Document, Spatial, Vector

Columnar / OLAP

Type

Database engine

Status

Active

Developer

DuckDB Foundation / DuckDB Labs

LakeSail

First release

2019

2024

Latest version

2.0.0 (Oct 21, 2026)

0.7.2 (Sep 29, 2026)

License

Open source (permissive)MIT License

Open source (permissive)Apache License 2.0

Free tier

✓

popularity

WhichDB Score

63.7

14.5

Rank

#13

#231

GitHub stars

42.6K

3.5K

Stack Overflow questions

501

–

scale & guarantees

Comfortable data size

Medium (≤ 10 TB)

Large (≤ 1 PB)

Horizontal scaling

None

Native

Multi-region

None

ACID

Full

Limited

Consistency

Strong

Schema

Strict

Flexible

Architecture

Embedded, Single node, In memory

Distributed, Single node, Client server

deployment

Self-hosted

✓

Vendor-managed cloud

—

Serverless

—

Embedded

✓

—

Edge

—

Clouds

–

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 (PostgreSQL-like dialect)

Spark SQL, Python (PySpark DataFrame API)

Client languages

Python, R, Java, JavaScript, Go, Rust, C, Swift

Python, Scala, Java, Go, Rust

Best for

OLAP, Embedded, Lakehouse, Warehouse

Lakehouse, OLAP, Streaming

Add more to this comparison Not sure either fits? Try smart match

DuckDB vs Sail: FAQ

What is the difference between DuckDB and Sail?

DuckDB: In-process columnar SQL database: the SQLite of analytics, running inside your app or notebook. Sail: Rust-native, Spark Connect-compatible engine for SQL, DataFrame and streaming jobs without the JVM. DuckDB is primarily a columnar / OLAP database; Sail is relational. Sail is built for larger datasets (≤ 1 PB) than DuckDB (≤ 10 TB). Horizontal scaling is none in DuckDB and native in Sail.

When should I choose DuckDB over Sail?

Choose DuckDB for local data analysis in notebooks; ETL and data-engineering pipelines on files; and embedded analytics inside applications. Choose Sail for cutting cost of PySpark ETL, local Spark development without a JVM and lakehouse batch jobs on Delta/Iceberg.

Is DuckDB or Sail more popular?

DuckDB ranks #13 on the WhichDB Score (63.7/100) and Sail ranks #231 (14.5/100). Popularity is not fit: check the requirements that matter for your project.

Are DuckDB and Sail open source?

Yes. DuckDB is open source. License: MIT License. Yes. Sail is open source. License: Apache License 2.0.