Open source
Open-source software publishes its source code so anyone can read, audit, modify, and run it. Atomic Blend is licensed under AGPLv3, a strong copyleft open-source license.
What it means
Open-source software makes its complete source code public. Anyone can inspect how it works, verify its security claims, fix bugs, or run their own copy — there are no hidden parts.
What AGPLv3 adds
The AGPL (Affero General Public License) v3 is a strong copyleft license: anyone who runs a modified version as a network service must also publish their source. It keeps the software — and improvements to it — open for everyone.
Why it matters for privacy
For a privacy product, "trust us" is not enough. Open source lets independent researchers verify that the encryption is real and the app does what it claims — no black boxes.
How Atomic Blend uses it
The entire Atomic Blend stack — apps and backend — is open source under AGPLv3. You can read every line, audit the encryption, and self-host it.