Rye IPA is an IPA brewed with rye. Rye typically makes up 25-30% of the malt blend, giving it a distinctive flavour and affecting its colour.
Rye gives the beer bready and peppery flavour notes, a creamy body, and a dry, grainy finish.
The birth of rye IPA was a natural progression as curious brewers are always looking for ways to stand out and rye is one of the easiest grains to experiment with.
Rye is quite a popular addition to IPAs (especially in the US) because it adds a bit of sharpness and spiciness to the beer.