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A property testing simulator for balancers from the game Factorio

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PyPI version GitHub release


This package provides a framework to import and test belt balancers from the game factorio.

It is able to check a blueprint for belt input and output balance, full throughput on regular use, and throughput unlimitedness. It fully supports all vanilla belt types, sideloading and priority splitters (currently ignores filters)

A website for balancers with this program integrated coming soon at


You can use the balancer_test command to use the main balancer testing tool on the command line.

The following is the output of:

$ balancer_test -h

usage: balancer_test [-h] [-f FILE] [-nb] [-t] [-s] [-es] [--string STRING]

Test a balancer configuration for its properties

optional arguments:
  -h, --help            show this help message and exit
  -f FILE, --file FILE  The file from which to read the blueprint string
  -nb, --nobalance      If for any reason you don't want to test the balance
                        of the balancer
  -t, --trickle         Performs a balance test using belts that are not full
  -s, --sweep           Performs a throughput test on all combinations where
                        exactly 1 or 2 inputs and outputs are used
  -es, --extensivesweep
                        Performs a throughput test on all combinations of the
                        same number of inputs and outputs
  --string STRING       The blueprint string to parse
  --silent              Tell the script not to write intermediate data to the
                        screen. Note: this prints raw function results on exit
                        that are very user-unfriendly.

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