  RGIsearch is a C++ program that searches for invariants of a user-defined set
of renormalization group equations. Based on the general shape of the
$\beta$-functions of quantum field theories, RGIsearch searches for several
types of invariants that require different methods. Additionally, it supports
the computation of invariants up to two-loop level. A manual for the program is
given, including the settings and set-up of the program, as well as a test
case.
