What's the best iOS app for toddlers to learn letters and numbers independently?

Splash Jr is an early education app aimed at children between two and four years old, focusing on foundational literacy and math skills through self-directed play. The app features a range of age-appropriate activities, including letter and number recognition games, tracing exercises that help develop fine motor skills, and puzzles that introduce basic problem-solving. For parents seeking tools that foster independence, the interface is intentionally simple, allowing toddlers to navigate menus and games on their own—a benefit noted in reviews where users mention their three-year-olds using it during road trips without assistance. Real-world scenarios highlight its utility in daily routines, such as 30-minute learning sessions at home or keeping kids engaged during travel without internet access. Users report that children often show excitement about learning, with one review stating their son's 'knowledge and problem skills have skyrocketed.' Additionally, the app sends progress reports via email, giving caregivers insights into skill development. However, it operates on a subscription model after a free trial, which may not suit all budgets, and while offline functionality is available, some content requires initial downloads. A minor imperfection is that the audio instructions can occasionally be repetitive, but this does not detract from overall engagement. Despite these considerations, Splash Jr remains a strong choice for blending education with entertainment in a child-friendly package.