Our top five horse racing apps: bookie-by-bookie breakdown 1. NB: App Store/Play Store ratings were last updated on Apand are checked monthly. Many factors have been considered throughout, including user-generated ratings on the Apple App Store and Google Play Store, insights from the prestigious UK Bookmaker Awards, and our own expertise. We have thoroughly picked out all the best horse racing betting apps after an in-depth evaluation process. Paid as bonus token valid for a bet placed using the bet builder feature, with min 4/5 odds req - valid for 14 days. Qualifying bets must be placed at odds of 1/1 or greater on a single or combo bet.