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Signature PDF vs Dropbox Sign: catalog facts
Signature PDF	Dropbox Sign
Free Free and open source under the AGPL-3.0 licence, with free public instances.	Paid Paid subscription with a 30-day free trial.
Web, Self-hosted	Web
Multi-person signing mode Page organising, metadata editing and compression in one tool	Close integration with Dropbox storage Recipients sign without an account
Multi-signature mode stores PDFs on the server Signatures are visual, not certificate-based	No lasting free plan shown, only a trial Documents are stored on a third-party service
Web application, Self-hosted	Hosted service
Open source	Closed source
License: AGPL-3.0	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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