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

performant java hashfunctions

Performant Java hash functions – today’s Java hash problems and our solution

Today, core Java APIs lack high quality hash functions, and 3rd party implementations provide sub-optimal performance. As non-cryptographic hash function are important building blocks of software, this is a major bummer for developers.

Generally, the selection of available hash functions is plenty, and in the last decade, many new hash functions emerged with very good hashing properties. Surprisingly, the core Java API just still offers Adler32 and CRC32, which were designed as checksums many years ago. Of course, there are many hash implementations available outside of the core Java API. However, Continue reading

Android ORM Performance 2016

With greenDAO 3 released, it’s time again to look at the Android ORM performance landscape and do some benchmarks. This time, we also tested newer ORMs for SQLite like DbFlow, requery, SQLDelight, and SquiDB. Also, we had an extensive look at benchmarks done by others. Let’s get started with our results:

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mobile-handy-database-comparison

Mobile databases: SQLite and SQLite alternatives for Android and iOS

At Droidcon Berlin, we noticed a lot of questions around databases and that many people weren’t aware of SQLite alternatives and Object-Relational Mappers (ORMs). Therefore, we follow up with an overview of the mobile database landscape.

What is a mobile database?

While Wikipedia defines a mobile database as “either a stationary database that can be connected to by a mobile computing device […] over a mobile network, or a database which is actually stored by the mobile device,” we solely refer to databases that run on the mobile device itself.

Why use a mobile database?

There are some advantages associated with using a mobile database:

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