Question: I'm looking for an online math tutor for my kids that can identify knowledge gaps and provide a personalized learning experience.

One of the top options is Maths-Whizz, geared for kids ages 5-13. It uses AI to build a customized learning experience that assesses knowledge gaps and adjusts its pace and difficulty accordingly. The service includes an initial assessment, interactive lessons and periodic assessments to measure progress, and is based on national curriculum standards. It also includes gamification and reporting for parents. It promises to raise the child's maths age by 18 months in the first year and offers flexible pricing options, including a 7-day free trial and a money-back guarantee.

Another top contender is AI Math Tutor, which offers personalized, interactive lessons using large language models. It offers on-demand tutoring with immediate hints and Socratic questions to help students learn to think critically. The service tracks student learning with knowledge graph profiling, which helps identify knowledge gaps and suggests targeted practice. It's available on the web, Apple App Store and Google Play, and has been shown to have a 20% higher accuracy in solving math problems than GPT-4.

For a broader approach, Khan Academy is a free, nonprofit online learning platform that covers a lot more subjects than just math. It offers personalized learning experiences, immediate feedback and resources for parents to help kids learn. It's got a good track record of success and is trusted by 90% of US teachers, so it can be a good option for students and teachers.

Last, Mathspace offers personalized learning experiences that are aligned with curriculum standards. It uses adaptive learning technology to offer immediate feedback and encourages student collaboration through interactive textbooks. Mathspace offers a variety of pricing plans, including a free personal plan and customized options for schools and districts, so it can be a good option for students who want targeted support and skill tracking.