232+ iOS apps curated and reviewed
The best a/b testing apps on iPhone average 4.7★ across 232+ titles — we've ranked them by what real users actually keep on their phones. Updated June 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (788K) | No | No | Aug 2026 |
| 2 |  | Free | 4.8★ (14K) | Yes | Yes | Aug 2026 |
| 3 |  | Free | — | No | Yes | Jul 2026 |
| 4 |  | Free | 4.8★ (689) | No | Yes | Aug 2026 |
| 5 |  | Free | 4.5★ (301) | No | Yes | Aug 2026 |
| 6 |  | Free | 5.0★ (1) | No | No | May 2026 |
| 7 |  | Free | 4.8★ (2K) | Yes | Yes | Aug 2026 |
| 8 |  | Free | 4.7★ (457) | Yes | Yes | Aug 2026 |
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Prepare for your CDL permit and endorsement tests with an FMCSA-approved app. It offers ELDT theory certification, exam-level practice questions, and personalized study tools to help you pass your commercial driver's license exams.
Prepare for your Commercial Driver's License (CDL) exam with a comprehensive practice test app. It offers over 1,200 questions mirroring the actual exam, covering all states and endorsements, with detailed explanations and personalized study based on your weak areas. Study anytime, anywhere, and improve your chances of passing on the first try.
Prepare for your EMT certification exams with customizable practice tests. Focus on weak subjects, understand concepts with detailed explanations, and build confidence for the NREMT, EMT B, AEMT, and Paramedic tests.
This app uses your iPhone's TrueDepth camera to track your gaze and determine unconscious preferences between visual variants. Upload images, look at pairs, and receive instant ranked results based on where your eyes linger.
Prepare for your ASE Series A automotive certification exams with realistic practice tests and quizzes. Featuring over 3,000 expert-written questions and detailed explanations, this app offers a personalized study plan and progress tracking to help you pass on your first attempt.
Practice German language skills with tests based on real-world scenarios. Improve grammar, vocabulary, and pronunciation through exercises divided by proficiency levels (A1, A2, B1). Includes visual aids and word puzzles for effective learning.
Prepare for your Commercial Driver's License (CDL) exam with over 1,600 practice questions covering all essential sections. Features a personalized study plan, readiness score, and detailed explanations to help you pass on your first attempt.
Prepare for the NREMT cognitive exam with over 1,600 realistic practice questions. This app offers detailed explanations, immediate feedback, and progress tracking to help you master EMS care topics and assess your readiness for the official test.
Prepare for your Commercial Driver's License (CDL) exam with a comprehensive study app. It offers practice questions, realistic simulators, and detailed explanations for all endorsements and states. Study efficiently with adaptive learning and offline access to pass your test on the first try.
Prepare for your Commercial Driver's License exam with state-aligned practice questions and realistic simulators. Features adaptive study plans, detailed explanations, and a readiness score to track your progress and boost confidence for test day.
Prepare for the EMT-B exam with practice tests covering key medical and emergency response topics. This app offers detailed explanations, topic-specific practice, and simulated mock tests to help you identify areas for improvement and maximize study time.
Prepare for ASE A-Series certification exams with a comprehensive test prep application. It offers over 1300 practice questions with explanations, various test modes, an exam simulator, and progress tracking to build confidence for automotive service technicians.
This app helps you design A/B experiments by calculating the precise number of participants needed for statistically valid results. It uses power analysis to determine the optimal sample size, ensuring your experiment is neither too short nor too long.
This app offers free German grammar exercises for levels A1 through C1. It provides animated explanations, overviews of grammar topics, and practice tests aligned with common European language frameworks. Ideal for learners seeking to improve their German grammar and vocabulary.
Prepare for ASE A-Series certification exams with comprehensive practice questions and AI-powered study assistance. This app offers topic-based practice, mock tests, and personalized study plans to help you identify weaknesses and optimize your learning for success.
Prepare for EMT certification exams with a comprehensive study tool. Access a vast question bank with detailed explanations, practice tests, and quizzes covering all essential topics. Track your progress and identify areas for improvement to boost your exam scores.
Prepare for your EMT-B, NREMT, and Paramedic exams with practice tests and personalized study tools. Focus on weak subjects, review mistaken questions, and create custom quizzes to track your progress and improve your scores.
Prepare for CompTIA A+ certification exams with practice tests and learning modules. Features include detailed explanations, a real exam simulator, and performance review after each test. Designed for efficient and long-term knowledge retention.