Almost all Sandstorm apps support real-time collaboration. It sounds like you tested draw.io, which unfortunately is one of the few that currently does not. Sa

Almost all Sandstorm apps support real-time collaboration. It sounds like you tested draw.io, which unfortunately is one of the few that currently does not. Sandstorm does not dictate what tech stack you use -- it supports any server stack that runs on Linux. Supporting real-time collaboration is normally the job of your tech stack. If you use Meteor, for example, you'll pretty much have it by default. Sandstorm does make real-time collaboration easier to operate at scale through fine-grained containerization: each "document" runs in a separate container as a separate instance of the app. Sandstorm ensures that there is never more than one instance running for a particular document, so you don't have to worry about concurrent writes coming from another machine. Scalability is achieved by distributing the documents across machines. https://sandstorm.io/how-it-works https://sandstorm.io/how-it-works