Cryptee

Cryptee is a safety and privacy focused, encrypted and cross-platform personal data storage service. You can write personal documents, notes, journals, store photos and all sorts of other files.

It works on all your devices and provides a zero-knowledge place to keep all your sensitive digital belongings. Cryptee has all the features you'd expect from a modern document editor, like live sync with unlimited devices, rich document editing, to-dos, markdown, hotkeys, code highlighting, latex math, embeds, attachments, support for tables, ability to attach pdf files, read epub ebooks, listen to audio-memos, as well as open and link other various file formats.