News: Stay up to date

The Étoilé community is an active group of developers, designers, testers and users. New work is being done every day. Visit often to find out what we've been up to.


CoreObject Preview Release

Posted on 3 June 2014 by Eric Wasylishen

CoreObject is a version-controlled object database for Objective-C that supports powerful undo, semantic merging, and real-time collaborative editing. It’s part of the Étoilé project.

Some of the features include:

  • a DVCS (focusing on personal version control right now) with branching and cheap copying, designed to work with very fine-grained commits (i.e. applications where every UI action creates a commit)
  • selective undo, based on diff/merge of object graphs (see
  • robust real-time collaborative editing, including sharing of revision history, per-user undo, all without operational transform
  • powerful undo system that is persistent (survives app restarts), branching, and can record all possible changes to a CoreObject store. You can undo things like reverting to past states, switching branches, deleting branches, deleting documents, etc.
  • automatic, metamodel-driven copying of subsets of an object graph

More at: and

There are several short videos at and some technical notes on how the system works at:

Get it

CoreObject is MIT-licensed. It has an extensive test suite which is passing on GNUstep and Mac OS X 10.7+, but our demo applications only work on Mac OS X 10.7+.

The source code, including dependencies, can be downloaded here:

You can grab the source code directory from Github, but without the dependencies:

For bugs reports, see: