Great tutorial website with lots of informative videos on numerous math concepts. We enjoy Beestar better as it has more practice questions and helps the kids more with the exams. However both website work really well and it helps our kids refresh their memory when they forget some math concepts.
Raz-kids was great in that there is audio available but the content felt a tad bit too simple for my students. We use Beestar instead for more classical stories, grammar components and test practices.