Open Source libraries to speed up app developers

Our open source libraries run on over a billion devices and are used by large companies with especially high performance requirements.
Learn about our widely used, battle-tested, and performance-optimized open source libararies for mobile app development:

> 2.000.000.000 people rely on greenrobot libraries

Slim & fast - that is what we stand for and that is why thousands of mobile developers wordlwide use our solutions, leading to more than a billion mobile users relying on our code

apps fast on the road

Superfast

Above all, we value performance. Speed matters. Thus, we constantly benchmark our solutions against alternatives and optimize for performance.
lean and light development

Lean & light

We keep all our solutions small and frugal. We also ensure all our open source libraries are optimized for maximum battery-friendliness. Perfect for mobile.
Easy to use libraries

Easy-to-use

We are developers ourselves and value the fun aspects of coding. Accordingly, our libraries are easy to use and save developers from tedious and unituitive tasks.
Open development

Developer-driven

We are passionate to deliver high performant, slim, and elegant solutions. Our libraries have more than 15.000 GitHub stars and are industry-proven.

Mobile News from greenrobot

Library updates, new releases, related developments in open source, mobile databases, and Android

Android Architecture with EventBus

Google’s Android Dev Summit 2015 covered a talk on Android Application Architecture. Android Apps often have complex interactions among data models, application logic, UI views and controllers, and networking. A solid architecture is the key to get this right. Watch the two Googlers Yigit Boyar and Adam Powell using EventBus as an important app’s component:

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greenrobot-common 2.3 with improved ObjectCache

Version 2.3 of greenrobot-common was just released and brings a new cache implementation: as the class ObjectCache suggests, caches a number of objects in memory. The API is used in a key-value like fashion, very much like a Map. It comes with a couple of cache-specific features though:
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Multimaps in greenrobot-common 2.2

We just released greenrobot-common 2.2, a small utility library that we use in almost every project. This version adds multimaps, which are absent from standard Java and Android.  Unlike a regular map, multimaps allow multiple values for a single key.
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