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Hemmelig vs 1time: catalog facts
Hemmelig	1time
Free The hosted service at hemmelig.app can be used free of charge; the code is under the…	Free Free to use and open source under the MIT licence.
Web	Web, Self-hosted, Browser extension, Command line
Client-side encryption of shared secrets Messages self-destruct after being read	Encryption happens in the browser before upload Optional passphrase and choice of view count
Source-available O'Saasy licence, not OSI open source Little documentation of features was available in the research	Trusting a hosted instance means trusting its served code Small project with few contributors
Web application	Downloadable app, Web application, Self-hosted, Browser extension
Closed source	Open source
License: O'Saasy	License: MIT
Not stated if an account is needed	No account needed
Needs internet	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.