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Hemmelig vs OTS: catalog facts
Hemmelig	OTS
Free The hosted service at hemmelig.app can be used free of charge; the code is under the…	Free Free and open source under the Apache-2.0 licence.
Web	Web, Self-hosted
Client-side encryption of shared secrets Messages self-destruct after being read	Encryption happens in the browser, so the server never sees plain text Secrets are deleted after the first read
Source-available O'Saasy licence, not OSI open source Little documentation of features was available in the research	In-memory storage loses secrets on restart Anyone who gets the link first can read the secret
Web application	Self-hosted
Closed source	Open source
License: O'Saasy	License: Apache-2.0
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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