Khan Academy's iOS application represents one of the most comprehensive free educational platforms available on mobile devices. The app maintains the organization's mission of providing free, world-class education for anyone, anywhere, with content spanning mathematics, science, economics, humanities, and computer programming. Its position in the educational technology market remains unique due to its completely free access model and extensive curriculum coverage from elementary to college-level material. The app's core functionality centers around video lessons, practice exercises, and personalized learning dashboards. Each subject area features progressively structured units with instructional videos typically ranging from 5-15 minutes in length. Practice exercises immediately follow video content, utilizing adaptive technology that provides hints and step-by-step solutions when users struggle. The mathematics curriculum particularly stands out for its comprehensive coverage, ranging from basic arithmetic to advanced calculus, with immediate feedback mechanisms that identify specific knowledge gaps. User experience demonstrates thoughtful mobile optimization with intuitive navigation and offline functionality. The interface employs a clean, distraction-free design that prioritizes content delivery over decorative elements. Real-world usage patterns show students typically engage with the app for supplemental learning, test preparation, and skill reinforcement. The personalized learning dashboard tracks progress across subjects, awards energy points for completed activities, and maintains streak counters to encourage consistent engagement. Performance remains stable across iOS devices with minimal loading times even for video content. User feedback consistently highlights appreciation for the free access model and comprehensive content coverage. Reviewer Gloriane Jose (September 12, 2025) expressed astonishment that "something as important as Khan Academy could ever be for free," reflecting common sentiment regarding the platform's value proposition. Multiple reviewers, including J Chavez 90 (September 14, 2025), noted the app's effectiveness in providing "deeper understanding of many aspects of Math." The adaptive learning approach receives particular praise, with Lola bunny (September 12, 2025) appreciating how "it helps me when I make mistakes and how it tells me the answer that I got wrong." The platform's primary strength lies in its unprecedented combination of breadth, depth, and zero-cost access. However, limitations include less interactivity compared to some subscription-based platforms and occasional content gaps in specialized advanced topics. The app serves most effectively as a supplemental educational tool rather than a complete replacement for formal instruction. Ideal use cases include test preparation, homework help, skill brushing, and self-directed learning across diverse age groups and educational backgrounds.