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Stirling PDF vs Censor: catalog facts
Stirling PDF	Censor
Freemium Free plan is $0/month with no card required (60+ tools, web/desktop/self-hosted, 500…	Free Free and open source under the AGPL-3.0.
Windows, macOS, Linux, Web, Self-hosted	Linux
55+ PDF tools covering signing, converting, merging, editing, OCR and redaction, chained in a stateful workspace with… Runs on Docker, bare metal, Kubernetes or as native desktop apps for Windows, macOS and Linux	Single-purpose tool for PDF redaction Native GTK4 and Adwaita interface
Open-core: SSO, external database, Google Drive integration, SAML and audit logs are gated behind paid Team or… Manual server setup needs Java 25+ plus LibreOffice and Tesseract for conversions and OCR	Linux only Does only redaction, not general PDF editing
Self-hosted, Downloadable app, Web application, Hosted service	Downloadable app
Open source	Open source
License: MIT	License: AGPL-3.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.