There are many educational apps available that can make learning fun for children across various age groups. Here are some popular options that cover a range of subjects from math and science to language and creative skills:

1. Khan Academy Kids (Ages 2-7)

   • Subjects Covered: Reading, writing, math, and problem-solving.
   • What Makes It Fun: The app includes a cast of colorful characters that guide children through educational games and stories, making learning interactive and engaging.

2. Endless Alphabet (Ages 3-6)

   • Subjects Covered: Reading, spelling.
   • What Makes It Fun: This app introduces children to letters and words through fun puzzles and animations that explain the meanings of the words in an entertaining and memorable way.

3. Duolingo (Ages 10+)

   • Subjects Covered: Language learning.
   • What Makes It Fun: Duolingo uses a game-like format with levels, rewards, and achievements to make language learning engaging and competitive.

4. DragonBox Series (Various Ages)

   • Subjects Covered: Math, algebra, and geometry.
   • What Makes It Fun: These apps turn complex math concepts into fun and engaging games that progressively teach children through playful interaction.

5. Toca Boca Apps (Ages 4-9)

   • Subjects Covered: Various (science, cooking, art, etc.)
   • What Makes It Fun: Toca Boca apps offer a sandbox environment where children can explore different themes like Toca Kitchen, Toca Nature, and Toca Lab without pressure or strict goals.

6. Star Walk Kids - Astronomy for Children (Ages 5-8)

   • Subjects Covered: Astronomy.
   • What Makes It Fun: Kids can learn about stars, planets, and constellations by pointing their device at the sky. The app is interactive and filled with engaging animations and fun facts.

7. Prodigy Math Game (Ages 6-14)

   • Subjects Covered: Math.
   • What Makes It Fun: Prodigy turns math into an exciting RPG (Role Playing Game), where children answer math questions to progress through a fantasy world filled with adventures.

8. PBS KIDS Games (Ages 3-8)

   • Subjects Covered: Various.
   • What Makes It Fun: This app features over 100 games from popular PBS KIDS series, covering a range of subjects in a playful, engaging way.

9. Quick Math Jr. (Ages 4-8)

   • Subjects Covered: Basic Math.
   • What Makes It Fun: The app uses games that help kids practice math operations, number recognition, and counting, all presented in a whimsical, child-friendly style.

10. Green Eggs and Ham - Dr. Seuss (Ages 3-6)

    • Subjects Covered: Reading.
    • What Makes It Fun: This app brings the classic Dr. Seuss book to life with interactive elements and read-along options to engage young readers.

These apps not only entertain but also educate, offering children a delightful way to develop their skills in various subjects. Each app is designed to engage children through interactive, often game-like experiences that can complement more traditional learning methods.