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With the emergence of the Covid pandemic in 2020, remote work has become a de-facto reality for a large portion of the world’s population. It is now clear that commuting to shared offices may never resume to previous levels. This in turn has led to an explosion in the development of collaboration software to address the needs of this new professional diaspora. MongoDB Realm, which is the world’s leading real-time mobile/cloud synchronized data-base, is at the very heart of this digital transformation. This product solves the extremely important problem of how to synchronize data produced and edited by client devices…


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MongoDB Realm is the leading offline-first synchronizing platform for developing collaborative cross-platform applications that do not require continuous connectivity. It is a real-time client side database that allows mobile or desktop apps to synchronize data to a MongoDB Atlas cluster. The Beta version of MongoDB Realm was released in June 2020, and has steadily been improving ever since. This platform is truly transformational because it is ushering in a whole new class of computing — notably collaborative software — where multiple users access shared data in a structured architected fashion.

At Cosync, Inc we are building a number of collaborative…


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I grew up in Paris France and went to French high-school there. There is a lot I loved about the culture, but one of the most frustrating aspects of French pedagogy was their inability to synthesize a complex subject down to something that was understandable. The term they used for anyone who succeeded in this task was called an oeuvre de vulgarisation — which literally translates to a masterpiece for the vulgar. In a my own attempt to explain MongoDB Sync Realm Permissions, I now present my own chef-d’œuvre de vulgarisation.


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In June 2020, MongoDB finally released their first beta version of MongoDB Realm — a real time database technology that combined the backend of MongoDB with the front-end mobile technology of Realm.io. Over the last five years, Realm has proven to be an invaluable object database to store cached web data for virtually all cloud connected apps. Whether a developer was using their own backend server and REST API, or a backend as a service product like Firebase, Realm was the only cross platform solution for iOS and Android development for storing local data. In late 2017, Realm introduced a…


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I have been a Realm Cloud developer since early 2018, shortly after the Realm company introduced its Realm Cloud upgrade to its native object data base. As a mobile developer, I have been using Realm since 2015 to cache all my local data for both iOS and Android development. In my opinion, Realm has been a necessary adjunct for any developer programming cloud based mobile applications, using simple REST APIs. Prior to the introduction of Realm Cloud, I used Google Firebase/Firestore as a server sync solution in conjunction with Realm, which I used for local object caching and storage. …


Realm.io versus Google Firebase — a security perspective

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This article is one of a series of short pieces in which I try to compare the features of Google’s Firebase product to Realm Cloud platform. Both of these offerings provide real-time data-base functionality for mobile applications; both are referred to as a backend as a service (mBAAS). This piece is focused on the differences in the security models between Firebase and Realm Cloud.

More information about Realm.io can be found at

More information about Google Firebase can be found at

I have been an iOS developer for the past seven years…

Richard Krueger

I have been a software entrepreneur for the past 25 years and an iOS programmer for the last eight years. I am the founder of Cosync, Inc.

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