As of my last update, there are numerous mobile applications where you can bet on the Kentucky Derby and other horse races. The availability of these apps may vary depending on your location within the United States due to different state laws regarding sports betting. Below are some popular betting apps that may offer the ability to bet on the Kentucky Derby:
1. **FanDuel Racing**: A popular platform for horse racing bets, including major events like the Kentucky Derby.
2. **DraftKings Sportsbook**: Known for its sports betting and fantasy sports offerings, DraftKings also offers horse racing bets.
3. **TwinSpires**: Operated by Churchill Downs Incorporated, TwinSpires is one of the most popular horse racing betting platforms and is the official betting partner of the Kentucky Derby.
4. **BetAmerica**: This app offers horse racing betting as well as casino-style games.
5. **William Hill**: A well-known name in sports betting, William Hill offers horse racing bets in addition to other sports wagers.
6. **Bet365**: This platform offers a variety of betting options, including horse racing.
7. **888sport**: An international sports betting site that may offer horse racing bets, including the Kentucky Derby.
Before downloading any app or placing a bet, it’s important to ensure that online betting is legal in your state and that the app is legal and regulated within your jurisdiction. Always gamble responsibly and ensure you are of legal age to bet. Additionally, the apps and services available may change over time, so it’s a good idea to check the latest information or consult with a legal expert if you have any doubts.