Cobalt
SQL WORKSA fast, focused, open-source desktop SQL client for SQL Server, Azure SQL and Microsoft Fabric. The spiritual successor to Azure Data Studio, written in Rust.
Downloads
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Windows: the installer needs no admin rights; the zip is portable. Linux: .deb for Debian/Ubuntu, .AppImage or the tarball elsewhere. macOS (Apple Silicon): the app is not yet notarized, so on first launch right-click the app and choose Open. Windows builds include a software renderer (Mesa llvmpipe) for VMs and RDP sessions without a GPU.
What it does
Connection library
Groups, colors, SQL login, Windows integrated auth, and Entra ID (interactive, device code, Azure CLI, service principal). Imports Azure Data Studio connections.
Fabric-native
Fabric Warehouse, SQL analytics endpoints and SQL database in Fabric connect out of the box, including the routing and protocol quirks other drivers miss.
Editor and results
T-SQL highlighting and completion, streaming results grid with a row cap and fetch-more, sort and filter, cell viewer, messages with clickable errors.
Exports that fit the lakehouse
CSV, Excel, JSON, XML, Markdown, plus Parquet, Arrow and Delta Lake tables — from a result set, or streamed straight from the query with Run to File, to a local file or a OneLake lakehouse.
Execution plans
Estimated and actual plan graphs with properties and top operators, and .sqlplan files open directly.
Light, fast, scriptable
A single native binary. Command palette, ADS keyboard shortcuts, history, hot exit, and an agent channel so tooling can drive the UI.