OrthoRBH is a tool/pipeline designed to identify families of protein coding transcripts/genes in related species using a reciprocal blast method. It can search through databases of full-length cDNAs, ESTs or mRNA-seq data. Optional assembly of candidate sequences allows assembly of contigs. It is suited to handling a mixture of EST and mRNA-seq sequence data. It performs batch blast searches, so it is ideal for large multi-gene families. After collecting candidate sequences, it performs sequence alignment and deposits sequences into a fasta sequence file for downstream molecular evolutionary analysis.