CryptPad
/ storageCryptPad is a private-by-design collaboration suite that serves as a secure alternative to Google Docs. It offers rich text documents, spreadsheets, kanban boards, and presentations, all encrypted in your browser before they are sent to the server. This “Zero Knowledge” architecture means that even the administrators of the CryptPad instance cannot read your documents—only you and the people you share the decryption keys with can access the content.
It requires no account registration to start; you can create a document instantly and share the link. CryptPad is funded by grants and donations rather than data mining, aligning its business model with user privacy. For teams and individuals needing real-time collaboration without exposing their brainstorming and sensitive drafts to corporate scanning, CryptPad is the go-to tool.