kiwisolver

A fast implementation of the Cassowary constraint solver

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Kiwi is an efficient C++ implementation of the Cassowary constraint solving algorithm. Kiwi is an implementation of the algorithm based on the seminal Cassowary paper. It is not a refactoring of the original C++ solver. Kiwi has been designed from the ground up to be lightweight and fast. Kiwi ranges from 10x to 500x faster than the original Cassowary solver with typical use cases gaining a 40x improvement. Memory savings are consistently > 5x.

In addition to the C++ solver, Kiwi ships with hand-rolled Python bindings for Python 3.6+.

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1.4.10rc0 pre-release

Aug 10, 2025

1.4.9

Aug 10, 2025

1.4.8

Dec 24, 2024

1.4.7

Sep 4, 2024

1.4.6

Sep 3, 2024

1.4.5

Aug 24, 2023

1.4.4

Jul 15, 2022

1.4.3

Jun 13, 2022

1.4.2

Mar 28, 2022

1.4.1

Mar 27, 2022

1.4.0

Mar 14, 2022

1.3.2

Aug 27, 2021

This version

1.3.1

Nov 2, 2020

1.3.0 yanked

Oct 28, 2020

Reason this release was yanked:

bad windows build

1.2.0

Apr 1, 2020

1.1.0

Apr 24, 2019

1.0.1

Oct 24, 2017

1.0.0

Sep 6, 2017

0.1.3

Jul 12, 2014

0.1.2

Jan 15, 2014

0.1.1

Jan 13, 2014

0.1.0

Jan 10, 2014

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kiwisolver 1.3.1

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