The Sun says it is designed for mainstream horseracing fans and allows players to place bets, check predictions and race cards, follow analysis and create a watch list.
Currently available in the Apple iOS store, the free-to-use app has five confirmed partners; Betway, Coral, Ladbrokes, William Hill and Unibet.
James Garmston, Director of Sun Racing, said: "We want Sun Racing to bring a new digital life to the industry, with a betting product that is built for the mainstream race fan and bettor. Horseracing is moving on and Sun Racing will deliver for the modern punter."
David Robinson, Managing Director of The Sun, said: "Sun Racing has already engaged a strong following of racegoers with its unique approach to horseracing, day-in-day-out scoops, pithy analysis and bite-size tips."
