From beginner-friendly picks to power-user tools, our 66 days prep list covers 250+ iPhone apps updated through September 2026. Compare ratings, prices, and screenshots in one place.
Master banking and consulting interviews with daily AI-powered practice. Track your progress on a 66-day journey with personalized feedback on technical, behavioral, and case questions. Improve your resume and gain confidence for top firms.
Prepare for the Series 66 exam with over 700 practice questions. This app uses a proprietary "chunking" learning technique to aid memorization and understanding. It offers a limited number of free questions daily, with an option to upgrade for full access and a pass or it's free guarantee.
Prepare for the CPA Exam with a comprehensive study and coaching system. Utilize adaptive learning technology, extensive practice questions, and expert-led lectures. Study anytime, anywhere with online and offline access, and sync your progress across devices.
66 Days - AI Interview Prep tops our 66 days prep apps ranking as of September 2026, with a 4.9-star average from 228 App Store ratings, and it's free to download.
Are there free 66 days prep apps for iPhone?
Yes — 20 of the top 66 days prep apps we rank are free to download, including 66 Days - AI Interview Prep and Series 66 Practice Test Prep.
Does 66 Days - AI Interview Prep have ads or in-app purchases?
66 Days - AI Interview Prep has no ads and offers in-app purchases, according to its App Store listing as of September 2026.
How many 66 days prep apps are on the App Store?
We track 250+ 66 days prep apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.