No. 17 of 28 ·Open Source License Compliance Software

OpossumUI

Windows · Mac · Linux

Freedom report

Two barsScore 5.6

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

OpossumUI is ranked #17 of 28 in open source license compliance software on Freedom251. It runs on Linux, macOS, Windows.

Compared on open source license compliance software

Free plan: Yes
Attribution reports: Yes
SBOM import formats: ScanCode JSON; OWASP Dependency-Check JSON
Deployment options: on-premise

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The record

Purpose: OpossumUI helps explore open-source components, review licenses in codebases, and generate reports from open-source code scans.
Scanner integrations: It combines findings from multiple scanners and names OSS Review Toolkit and ScanCode as integrations.
Audit workflow: The app provides a unified interface for browsing scanner evidence, navigating a codebase file tree, and creating attributions for files or groups.
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.
Exports: It exports SPDX documents as JSON or YAML, component lists as CSV, and follow-up documents for items flagged for legal review.
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.
Platforms: The user guide provides downloads and run instructions for Linux, macOS, and Windows.
Linux caveat: The README says Ubuntu 22.04 and later can have an AppImage sandboxing issue, with a documented --no-sandbox workaround.
macOS caveat: The README says the macOS app is not officially signed and must be explicitly allowed in System Settings.
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.
File handling: OpossumUI works with .opossum files containing license-compliance data that can be visualized and edited in the app.
License: The project states that OpossumUI is licensed under Apache-2.0 and its documentation under CC0-1.0.
Maintainer: The GitHub organization identifies itself as opossum-tool and describes OpossumUI as a lightweight app for open-source license compliance audits and inventory.
Core workflow: It lets users explore software components, review licenses, and generate reports from open-source scans.

Where it ranks on Freedom251

Best Open Source License Compliance Software in 2026#17 of 28

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Sources

github.com/opossum-tool/OpossumUI· checked 4 Oct 2026
github.com/opossum-tool/OpossumUI/blob/main/USER_G· checked 4 Oct 2026
github.com/opossum-tool· checked 4 Oct 2026