Based on your search for free iPad apps for ESL learners, both ElevenLabs and Quizlet could be beneficial. However, Quizlet seems to be a more direct fit for your needs.

Quizlet is a platform that allows teachers and students to create or find study sets for a range of subjects. These sets contain flashcards, quizzes, and games designed for active learning and memorization. This could be particularly useful for ESL learners, as it provides a fun and interactive way to learn new vocabulary and practice language skills.

Some key features of Quizlet that could be beneficial for ESL learners include:

• Rote Memorization Training: This feature can help students commit new English words and phrases to memory through repetition.
• User-Created Study Sets: These offer multiple study modes such as Flashcards, Learn, Test, and Match, each serving a unique role in helping students grasp new language concepts.
• Quizlet Live: This feature allows you to turn study sets into live, interactive classroom quizzes, which could be a fun way to engage ESL learners and encourage active participation.
• Custom Resource Creation: As a teacher, you can create your own flashcards and study sets tailored to the specific needs of your ESL students.

Quizlet also offers a free plan, making it a cost-effective solution for your needs. However, if you find that you need more advanced features, there are also paid plans available.