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We present STR (Star-Triangle Relations), a Mathematica package designed tosolve Feynman diagrams by means of the method of uniqueness in any Euclideanspacetime dimension. The method of uniqueness is a powerful technique to solvemulti-loop Feynman integrals in theories with conformal symmetry imposing somerelations between the powers of propagators and the spacetime dimension. In ouralgorithm we include both identities for scalar and Yukawa type integrals. Thepackage provides a graphical environment in which it is possible to draw thedesired diagram with the mouse input and a set of tools to modify and computeit. Throughout the use of a graphic interface, the package should be easilyaccessible to users with little or no previous experience on diagramscomputation. This manual includes some pedagogical examples of computation ofFeynman graphs as the scalar two-loop kite master integral and a fermionicdiagram appearing in the computation of the spectrum of the $\gamma$-deformed$\mathcal{N}=4$ SYM in the double-scaling limit.

STR: a Mathematica package for the method of uniqueness