I have frequently used devdocs.io on long flights, love the offline mode.

To your point and for precisely this reason, we offer realtime capabilities but on top of the Elasticsearch engine[1]. We also have a cloud native version in preview (that we are actively developing) which addresses deployment flexibility[2][3].

[1] https://appbase.io [2] https://store.docker.com/images/appbaseio [3] https://appbaseio-confidential.github.io/streams

We offer this at appbase.io, it runs on top of Elasticsearch (no vendor lock-in) and a cloud native version that you can run anywhere is now available in preview at https://store.docker.com/images/appbaseio.