Alternative/Private online document editors

Hello, I’m looking for private alternatives of cloud-based online document editors like Google Docs or Apple’s iCloud Notes app. Are there any alternatives of services that allow to create documents and edit them in real time from different devices whilst saving them in the cloud?

At the moment I’ve been saving certain documents to Proton Drive, downloading them, saving the changes and then uploading them back up, but since I need to edit various text based documents at the same …

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