Open-source alternative · mapped from 0 paid tools. Fit is not feature parity.
Facts
LicenseMIT LicenseA short and simple permissive license with conditions only requiring preservation of copyright and license notices. Licensed works, modifications, and larger works may be distributed under different terms and without source code.MayCommercial useModificationDistributionPrivate useMustLicense and copyright noticeNoLiabilityWarrantySummary from GitHub's choosealicense.comStirling PDF User License (custom license)Not a standard license, so GitHub's license summaries don't cover it. Read the project's license text before relying on it.
Paid-feature tierUTier ULicense or parity scope unresolved
Self-hostSelf-hostable: yesYou can run it on your own server.
Paid-feature limits3 noted
Login-capable Free server limited to five users; Team adds capacity.
External database, clustering, S3/database file storage, metrics and custom metadata require Team.
SAML, audit logs and offline license activation require Enterprise.
Tier U: Mixed-license project. Pinned root grants MIT only outside eight excluded directories, including engine, proprietary editor, desktop, SaaS/cloud and processor. Restrictive User License observed for engine/editor modules. A complete operational build from only MIT code was not established; full distribution is not certified OSI and excluded from default recommendations. Paid admin gates are documented separately from processing service costs. License source. Repository: Stirling-Tools/Stirling-PDF. Self-host: hybrid; hosted offer from the project: yes.