Download of Cryptonium 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac app is an intellectual property of Origin Horizon LLC. Cryptonium for Mac relates to Productivity Tools.
From the developer:
Cryptonium is an app for taking notes. It was created by taking inspiration from technologies such as Bitcoin. The app uses industry standard encryption to protect and sync your data while allowing you to remain completely anonymous. It is a privacy focused app for your thoughts and ideas. Powerful features like Markdown, hierarchical organization and tagging make capturing your thoughts and ideas a joy.
You may want to check out more Mac applications, such as 3dissue, Blurb Tally or iTeXMac, which might be similar to Cryptonium.