Cryptpad

Zero knowledge, collaborative, real time editing of WYSIWYG and text documents, and now polls, with more applications under development.

Free
Open Source
Web
Self-Hosted

cryptpad is a suite of zero knowledge, realtime collaborative editors and applications. encryption carried out in your web browser protects the data from the server, the cloud, and the nsa. the secret encryption key is stored in the url fragment identifier which is never sent to the server but is available to javascript so by sharing the url, you give authorization to others who want to participate.

cryptpad uses a variant of the operational transformation algorithm which is able to find distributed consensus using a nakamoto blockchain, a construct popularized by bitcoin. this way the algorithm can avoid the need for a central server to resolve operational transform edit conflicts and without the need for resolving conflicts, the server can be kept unaware of the content which is being edited on the pad.

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Official Website
Twitter

Features

Collaborative writing Real time collaboration WYSIWYG Support Encrypted Notes No registration required End to end encryption Zero Knowledge Direct file uploading

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Standard Notes

Love Notes. Love Encryption. Standard Notes is a safe place for your notes, thoughts, and life's work. It's simple. Standard Notes is the easiest notes app you'll ever use.

Freemium Open Source

Extensible by Plugins/Extensions Privacy focused Privacy protection Security focused Ad free Works Offline Android Sync Cloud sync MarkDown support Sync between devices Tag based Sync with Dropbox AES encryption Encrypted Notes Client side encryption Decentralized End to end encryption Cross platform Very strong privacy Clean design Content Filtering Local Storage Nested Folders Plain text authoring Plugin support Privacy Protected Real time sync

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Cryptpad

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