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SQLancer

SQLancer is ranked #10 of 26 in database testing tools on Freedom251. It runs on Linux, macOS, Windows. There is a free plan.

SQLancer plans and pricing

Free Free MIT License · no paid tiers listed sqlancer.github.io · 4 Oct 2026

Compared on database testing tools

Free plan: Yes
Database support: Citus, ClickHouse, CockroachDB, Databend, Apache DataFusion, Apache Doris, DuckDB, H2, Apache Hive, HSQLDB, MariaDB, Materialize, MySQL, OceanBase, PostgreSQL, Presto, QuestDB, Apache Spark, SQLite, TiDB, YugabyteDB
Data quality checks: Yes
Test execution: self_hosted
Test language: SQL

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SQLancer

Purpose: SQLancer automatically tests database management systems to find bugs in their implementation.
Test generation: It generates SQL statements and database states, then validates queries using test oracles.
Bug types: It targets logic bugs, performance issues, unexpected internal errors, and database crashes.
Testing methods: Its listed test oracles include TLP, NoREC, PQS, DQP, CODDTest, and CERT.
Adoption: The impact page reports 22 DBMS projects with evidence of using SQLancer.
License: The project says it is free to use under the MIT License.
Requirements: The README lists Java 11 or above and Maven as minimum requirements.
Distribution: The README says releases are available through GitHub, Maven Central, and DockerHub, and recommends the latest source on GitHub.
Embedded databases: DuckDB, H2, and SQLite are supported as embedded systems with binaries included as JAR dependencies.
Run behavior: SQLancer can run indefinitely when it finds no bugs; the README describes options to stop after a chosen number of bugs or a timeout.
Support: The project README points users to a Slack workspace for SQLancer and DBMS testing discussions.
DBMS version limits: The README says SQLancer is tested against specific DBMS versions and that testing other versions can produce false alarms.
Price from: Free

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Where it ranks on Freedom251

Best Database Testing Tools in 2026#10 of 26

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Sources

github.com/sqlancer/sqlancer· checked 4 Oct 2026
sqlancer.github.io/impact/· checked 4 Oct 2026
sqlancer.github.io· checked 4 Oct 2026