SPIKEY: An interactive key to Triodia spinifex grasses of the Pilbara, Western Australia is an interactive identification tool covering all of the hummock grasses (the genus Triodia) colloquially known as ‘spinifex’ that occur in the Pilbara bioregion and adjacent areas of Western Australia. This key covers a total of 28 species and one hybrid, about one-quarter of the species in the genus Triodia, using 28 features. This is an important update; about half of the species treated are recently described, and are not covered by earlier synopses of Triodia. Triodia are the dominant plants and a major restoration target in arid zone hummock grasslands, an ecosystem covering 18% of Australia, and correct identification is critical to successful restoration and rehabilitation. This app is intended to be used by land managers, rehabilitation practitioners, botanical consultants, seed collectors, identification botanists and anyone curious about Triodia.