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

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