7 Best Knowledge Graph AIs for Test Prep

Wolfram Alpha is a computational knowledge engine that draws from a massive curated knowledge base and advanced algorithms to answer factual queries, perform calculations, and generate visualizations. Although primarily known as a search engine, Wolfram Alpha’s underlying knowledge graph links concepts across mathematics, physics, chemistry, economics, and more, making it a powerful tool for test‑prep students who need quick, accurate answers and step‑by‑step solutions. The platform offers a Pro subscription that unlocks additional computational power, custom data uploads, and API access, allowing educators to embed Wolfram Alpha’s capabilities into their own study apps or websites. Key features include real‑time computational queries, interactive visualizations, and the ability to upload custom datasets for tailored problem sets. The API supports integration with web pages, mobile apps, and even voice assistants. Pricing for the Pro plan starts at $5 per month, with a yearly plan for $60, while businesses can opt for the Wolfram|Alpha API Enterprise plan with custom pricing. Wolfram Alpha is best suited for STEM test prep, especially mathematics and physics, where students can benefit from instant computational checks and detailed solution walkthroughs.

Chegg Study is a subscription‑based learning platform that offers instant access to step‑by‑step solutions for thousands of textbook problems across subjects like mathematics, science, and engineering. Powered by a knowledge graph that maps textbook chapters, concepts, and problem types, Chegg’s AI assistant guides students through the logic of each solution, often highlighting related topics and prerequisite knowledge. The platform’s database includes over 500,000 textbook solutions, and the AI can suggest supplemental learning resources based on the student’s progress. Key features include textbook solution search, full‑page problem uploads, interactive step‑by‑step explanations, and a mobile app for on‑the‑go study sessions. Chegg also offers a Study Planner tool that tracks learning goals and provides reminders. Pricing starts at $12.95 per month for the Study subscription, with discounts for academic institutions. Chegg Study is ideal for high‑school and college students who need detailed problem solutions and supplementary learning materials.

Quizlet is one of the most popular study‑tool platforms, offering digital flashcards, games, and AI‑generated study sets. Its knowledge graph underlies the way it connects related terms, definitions, and contexts, enabling students to see how concepts interrelate across subjects. Quizlet’s AI features include auto‑generated study sets from user‑uploaded content, spaced‑repetition algorithms, and a “Learn” mode that adapts to performance. Key features include thousands of user‑generated flashcard sets, AI‑generated study sets, spaced repetition, interactive games (Match, Gravity, etc.), and a Study Planner. Quizlet offers a free tier and paid plans: Plus at $6.99/month (or $69/year) and Premium at $9.99/month (or $99/year), with additional features such as offline access, advanced statistics, and premium study sets. Quizlet is best for students who prefer flashcard‑based learning and want AI assistance to create personalized study materials.

Socratic is a free mobile app from Google that assists students with homework across subjects by providing step‑by‑step explanations, videos, and curated resources. The app’s AI engine leverages a knowledge graph that maps concepts from textbooks, educational standards, and online resources, allowing it to surface relevant explanations and visual aids. Socratic can process images of questions, use OCR to interpret text, and then retrieve contextual answers from its graph. Key features include image‑based question recognition, video explanations, curated resource links, and subject categorization. Socratic is free and available on iOS and Android. It does not have a subscription model, though its content is supported by ads. Socratic is ideal for middle‑school and high‑school students who need quick, visual explanations for a wide range of subjects.

Knewton, now part of Wiley Learning, is an adaptive learning platform that uses data analytics to tailor content to each student’s needs. Its knowledge graph tracks prerequisite relationships between concepts, allowing the system to identify gaps and suggest targeted practice. Knewton’s AI algorithms analyze student responses in real time and adjust the difficulty and sequence of problems accordingly. Key features include adaptive content sequencing, data‑driven performance analytics, and integration with LMS platforms. The platform is primarily aimed at educational institutions and publishers. Pricing is not publicly disclosed; institutions typically contact Wiley for a custom quote based on enrollment and course scope. Knewton is best for schools and universities seeking adaptive, data‑driven test‑prep solutions that can be integrated into existing LMS ecosystems.

Squirrel AI Learning is a Chinese‑origin adaptive learning platform that leverages AI and big data to deliver personalized tutoring. Its knowledge graph maps learning objectives, prerequisite knowledge, and student progress, enabling the system to recommend precisely the content that will close each learner’s gap. Squirrel AI offers a range of services from classroom tutoring to online exam preparation, with real‑time analytics and AI‑driven lesson planning. Key features include intelligent tutoring, dynamic content recommendation, mastery‑based progression, data analytics dashboards, and integration with educational institutions. The platform is primarily used in China, but it has expanded to international markets. Pricing details are not publicly available; potential customers should contact the company for a custom proposal. Squirrel AI is ideal for schools and learners seeking intensive, data‑driven test‑prep that adapts to individual learning curves.