Website for beginners who want to practice both hiragana and katakana.
If you're a beginner, I highly recommend going to https://realkana.com/ to practice your hiragana and katakana skills. This website also includes the hiragana and katakana doubles.
If you are only using a mobile device, the website is mobile friendly. What works even better is downloading the app on your phone. The name of the app is the same as the website.