OpossumUI

Spec sheet

Purpose

OpossumUI helps explore open-source components, review licenses in codebases, and generate reports from open-source code scans.Read 4 Oct 2026 · github.com

Platforms

The user guide provides downloads and run instructions for Linux, macOS, and Windows.Read 4 Oct 2026 · github.com

License

The project states that OpossumUI is licensed under Apache-2.0 and its documentation under CC0-1.0.Read 4 Oct 2026 · github.com

Attribution review

Users can create and edit attributions for individual files or groups of resources.Read 4 Oct 2026 · github.com

Audit workflow

The app provides a unified interface for browsing scanner evidence, navigating a codebase file tree, and creating attributions for files or groups.Read 4 Oct 2026 · github.com

Core workflow

It lets users explore software components, review licenses, and generate reports from open-source scans.Read 4 Oct 2026 · github.com

Exports

It exports SPDX documents as JSON or YAML, component lists as CSV, and follow-up documents for items flagged for legal review.Read 4 Oct 2026 · github.com

File formats

OpossumUI works with `.opossum` files and can directly import ScanCode JSON and OWASP Dependency-Check JSON files.Read 4 Oct 2026 · github.com

File handling

OpossumUI works with .opossum files containing license-compliance data that can be visualized and edited in the app.Read 4 Oct 2026 · github.com

Imports

It can directly import ScanCode JSON and OWASP Dependency Check JSON files; OSS Review Toolkit results can be converted using a reporter and imported.Read 4 Oct 2026 · github.com

License expression limit

SPDX license expressions are only partially supported; the README says the full applicable license text should also be entered in the license-text field.Read 4 Oct 2026 · github.com

Linux caveat

The README says Ubuntu 22.04 and later can have an AppImage sandboxing issue, with a documented --no-sandbox workaround.Read 4 Oct 2026 · github.com

macOS caveat

The README says the macOS app is not officially signed and must be explicitly allowed in System Settings.Read 4 Oct 2026 · github.com

macOS signing

The project says the macOS app is not officially signed and must be explicitly allowed in System Settings.Read 4 Oct 2026 · github.com

Maintainer

The GitHub organization identifies itself as opossum-tool and describes OpossumUI as a lightweight app for open-source license compliance audits and inventory.Read 4 Oct 2026 · github.com

Notable limitation

SPDX license expressions are only partially supported; the guide says the full license text should also be entered in the license-text field.Read 4 Oct 2026 · github.com

Scanner integrations

It combines findings from multiple scanners and names OSS Review Toolkit and ScanCode as integrations.Read 4 Oct 2026 · github.com

Security use case

For blind intellectual-property audits during mergers and acquisitions, the project says only compliance-relevant metadata needs to be exposed in the app, without sharing source code.Read 4 Oct 2026 · github.com

Source-code handling

For blind audits, the project says the app can expose only compliance-relevant metadata without sharing source code.Read 4 Oct 2026 · github.com

Support and updates

The user guide directs users to GitHub releases and says they can check for updates through the app’s Help menu.Read 4 Oct 2026 · github.com

Supported downloads

The user guide provides downloads for Linux, macOS, and Windows.Read 4 Oct 2026 · github.com

Use cases

The project describes license-compliance audits, software bills of materials, and blind intellectual-property audits during mergers and acquisitions as use cases.Read 4 Oct 2026 · github.com

Where Specifiction places it

• Open Source License Compliance Software#24 of 287.3