That would be really neat, but the core technology of Realm is written in native code. Somebody in the community could certainly create a Realm-like API for web

That would be really neat, but the core technology of Realm is written in native code. Somebody in the community could certainly create a Realm-like API for web local storage. If you (or anyone else reading this) is interested in building it, I would suggest building it on top of localForage (https://github.com/mozilla/localforage https://github.com/mozilla/localforage), and definitely hit me up if you'd like to further discuss implementation details!