We address the task of migrating standalone model-based applications to the web, where we face the need to synchronize models between the client and the server. Because of synchronization overhead and limited server memory that has to be shared among all connected users, there is the risk that the model storage could become a bottle-neck. We propose a model repository that uses an efficient encoding of the model that resembles its Kolmogorov complexity and is suitable for direct sending over the network (with almost no serialization overhead). All traverse and query operations can also be implemented efficiently by introducing just 3 automatic indexes. By utilizing the OS paging mechanism, we are able to hold 10,000 and more repositories on a single server.