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Travis C++ PythonVersions PythonImpl PythonFormat PyPIVersion Coveralls


Keyvi - the short form for "Key value index" is a key value store (KVS) optimized for size and lookup speed. The usage of shared memory makes it scalable and resistant. The biggest difference to other stores is the underlying data structure based on finite state machine. Storage is very space efficient, fast and by design makes various sorts of approximate matching be it fuzzy string matching or geo highly efficient. The immutable FST data structure can be used stand-alone if online writes are not required.

This is the continuation of cliqz-oss/keyvi. Keyvi was initially developed at Cliqz by Hendrik Muhs and others. For more information, please refer to




Precompiled binary wheels are available for OS X and Linux on PyPi. To install use:

pip install keyvi

From Source

The core part is a C++ header-only library, but the TPIE 3rdparty library needs to be compiled once. The commandline tools are also part of the C++ code. For instructions check the Readme file.

For the python extension of keyvi check the Readme file in the python subfolder.



If you like to go deep down in the basics, keyvi is inspired by the following 2 papers:

Release procedure

Licence and 3rdparty dependencies

keyvi is licenced under apache license 2.0, see licence for details.

In addition keyvi uses 3rdparty libraries which define their own licence. Please check their respective licence. The 3rdparty libraries can be found at keyvi/3rdparty.

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