DuckDB UI

DuckDB UI is a browser-based interface for working with a local DuckDB instance. It is best suited to people who want to query and inspect data without making a cloud connection part of their normal workflow.

Overview

Start the interface with duckdb -ui or CALL start_ui(); it opens in the default browser. DuckDB serves it through an embedded HTTP server, normally at http://localhost:4213. Queries run through the native DuckDB process, so the UI can use local cores, memory, and files. By default, queries and data stay on the computer, a useful boundary for local analysis.

MotherDuck is an optional connection: using it requires opting in and signing in. The local server fetches UI files from ui.duckdb.org. Take care with alternate configured URLs, since the application can access the DuckDB data loaded into it. DuckDB UI does not support running directly on a read-only database, which makes it unsuitable for workflows that depend on one.

Key features

The SQL notebook pairs autocomplete with keyboard shortcuts, supporting an iterative query workflow. A catalog browser and table explorer help navigate data and inspect column-level statistics; the results viewer adds sorting and filtering. Together, these features make DuckDB UI a focused tool for exploring and working with DuckDB data, rather than a broad database environment. It supports data editing and CSV result export.

Pricing

DuckDB UI is free. The Free local DuckDB UI plan costs free and includes a browser-based interface, a local SQL notebook, and an optional MotherDuck connection. There is no paid plan to weigh against it; the trade-off is the product's narrow focus on DuckDB and its read-only database restriction.

Platforms

DuckDB UI is offered as an extension, with Linux, macOS, Windows, web, and self-hosted platform support. It currently does not support windows_arm64, so Windows users on that architecture should look elsewhere.

Who it's for

Choose DuckDB UI if you want a free browser interface for local DuckDB work, with notebook conveniences and tools to inspect tables and results. Its default local execution suits users who want queries and data to remain on their computer, while the optional MotherDuck connection serves those who want that integration. It is a poor fit for read-only databases or unsupported Windows ARM64 systems.

Pros and cons

Pros

• Local by default: queries and data stay on the computer, while DuckDB can use local cores, memory, and files.
• Useful exploration tools: autocomplete, table statistics, result sorting, and filtering support a practical SQL workflow.
• Free with optional cloud access: local use costs nothing, and MotherDuck requires explicit opt-in and sign-in.
• CSV export and data editing: the UI supports editing data and exporting results in CSV format.

Cons

• No direct use on read-only databases: this rules it out for workflows that require a read-only database.
• No windows_arm64 support: users on that platform cannot use the UI.
• Alternate UI URLs require care: the application can access loaded DuckDB data, so configured sources should be trusted.

Alternatives

For a different database option, consider CrateDB, which has a free shared plan with 2 vCPUs, 2 GiB RAM, and 8 GiB storage. Exasol may suit readers considering a freemium database with pay-as-you-go plans, including an XS plan at $3.30 a month. QuestDB offers a free, self-managed, single-instance open-source core with community support.

Apache Druid is a free, downloadable analytics database for self-hosting. Teradata VantageCloud is another option, with a freemium model and a free trial. For open-source data warehouse software, consider Apache Hive; for open-source software distributed under Apache License 2.0, Apache Impala is another alternative. Apache Kylin is a free open-source OLAP engine.

Readers comparing database categories can browse OLAP Databases, Spatial Databases, Columnar Databases, OLAP Software, Embedded Databases, and Database Client Software.

Verdict

DuckDB UI is a strong choice for people who want a free, local-first SQL notebook and data explorer for DuckDB. Its practical appeal is a useful browser workflow without default data transfer; choose another tool if you need to run against read-only databases or use Windows ARM64.