Free local-first desktop app

Download SIERRA

Install the local-first workspace for evidence, chronology, notes, and investigator tools. Your case stays on your machine.

No account required

Case files stay local

Choose a build

Download for your computer.

Windows

macOS

Linux

Version: 6.21.1 (5.June.2026)

No account required. Case files stay local.

Included locally

Build, revisit, and move the investigation without buying a Cloud plan.

Evidence and relationship workspace

Local invokers and MCP tools

Time-aware connections

Obsidian import and export

Optional cloud

SIERRA Cloud plans add AI Assistant access and monthly cloud tokens. The desktop workspace stays free.

Responsible use

Lawful, authorized use only. Demos are fictional; users are responsible for permissions and compliance. Details.

Product updates

Keep up with SIERRA.

Release notes and meaningful product updates. Nothing else.

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In silence, patterns emerge.

Investigation tools for professional teams that need to keep the sources, reasoning, and next steps together.

Built in Melbourne for professional investigation work.