More than 80,000 apps are labeled as educational, but little research has demonstrated their actual quality. Products pitched as "interactive" should require more than "pushing and swiping." Look to organizations like Common Sense Media for reviews about age-appropriate apps, games and programs to guide you in making the best choices for your children.
Personal Note: Healthychidren.org has a wonderful series of advice for parents. I have saved each of them and have made them available at this link.