Free & open source · Public Preview

See how your SQL database handles a workload.

Configure queries, run concurrent users, and watch performance live with sqlsim Studio. Go from a single query to a repeatable load test in a local browser app.

Download for Windows → Run your first workload

v1.0.0 · Windows x64 · Includes Studio and both CLIs.
Requires ODBC Driver 18 and access to a SQL database. No .NET install needed. Installation guide

Prefer the command line? Explore sqlsim and sqlpysim, including Linux options.

See sqlsim Studio in action
sqlsim Studio workload configuration and live monitoring interface
Configure a workload, watch live monitoring, then review and compare results. Read the Studio walkthrough →

Four ways to work

Start visually, automate from the command line, compare drivers, or describe the experiment in plain language.

1

sqlsim Studio

Configure, monitor, replay, and compare workloads in a self-contained local browser app.

Explore Studio →
2

sqlsim

Native C++ and ODBC for low-overhead scripts, concurrent load tests, and replay.

Read the CLI guide →
3

sqlpysim

A Python workflow powered by Microsoft's mssql-python driver for automation and comparison.

See Python examples →
4

Workload Builder

Use GitHub Copilot and other agents to design and compare experiments from plain-language requests.

Use with agents →

One toolkit, every SQL Server target

Use the same workload patterns across local development, Azure, and Microsoft Fabric.

✓SQL Server 2019, 2022, and 2025
✓Azure SQL Database and Managed Instance
✓SQL database in Microsoft Fabric
✓Windows and Ubuntu Public Preview paths

Run your first workload

Start with Studio on Windows. No hosted service, no .NET install, and no telemetry sent elsewhere. Use a development or test database you have permission to load test.

1
Download and extract →Install Microsoft ODBC Driver 18. Download the Windows bundle, unblock the trusted ZIP in Properties, then extract it. Keep the folder structure intact.
2
Open Studio and connectDouble-click sqlsimstudio\sqlsimstudio.exe. In your browser, choose your SQL server, database, and authentication method.
3
Run, watch, and compare →Enter a query, start with a small thread and iteration count, and run it. Watch live progress and review results before increasing the load.