7 Must-Have Knowledge Graph AIs for Test Prep

ChatGPT is a versatile large language model developed by OpenAI that has become a staple for educational support and test‑prep assistance. The model can answer questions, explain concepts, and even generate practice problems across a wide range of subjects. While ChatGPT does not expose a traditional knowledge graph, its training on massive corpora allows it to retrieve factual information quickly. The platform offers a free tier for casual users and a paid ChatGPT Plus subscription at $20/month, which provides faster response times and priority access during peak usage. Educators can integrate ChatGPT via the OpenAI API into their own applications or use the chat interface directly. Key to its appeal is the model’s ability to adapt to user prompts and context, offering step‑by‑step explanations that can be tailored to different learning levels. However, because it relies solely on statistical patterns in the data it was trained on, the system may hallucinate facts or provide incomplete answers if the user’s query falls outside its knowledge cutoff. For high‑stakes test prep, it’s often recommended to cross‑verify answers with authoritative sources. Despite these limitations, ChatGPT’s broad coverage, ease of use, and ongoing improvements make it a valuable tool for reinforcing study material and generating new practice questions.

Jasper AI is a commercial AI content‑generation platform that has expanded into educational tools, including a study‑assistant mode designed to aid test preparation. The platform uses GPT‑based models to produce study guides, flashcards, and practice questions. Jasper’s interface is highly user‑friendly, featuring a template library and a drag‑and‑drop editor that allows non‑technical users to generate content quickly. The platform offers a Starter plan ($29/month), a Pro plan ($59/month), and a Business plan ($99/month), each unlocking more content generation limits and collaboration features. While Jasper does not provide a dedicated knowledge graph, it can ingest custom documents to improve answer accuracy—a feature that can be leveraged by educators to tailor content to specific syllabi. Its AI tutor mode can walk students through complex problems and offer step‑by‑step solutions, making it a useful companion for learners. The main constraint is that Jasper is primarily a content generator; it does not offer built‑in chat widgets or long‑term memory for conversational interactions, so integration with a test‑prep website would require additional development.

Copy.ai is an AI‑powered copywriting tool that has broadened its offerings to include educational content generation. The platform can produce lesson plans, study prompts, and quiz questions across multiple subjects. Copy.ai’s interface is straightforward, with a menu of templates and a simple prompt editor. Users can choose from a free tier with limited monthly usage or upgrade to a Pro plan at $35/month for higher limits and priority access. For test prep, Copy.ai can quickly generate practice questions and explanations, though it does not feature a knowledge graph or conversational AI. Its strengths lie in rapid content creation and ease of use, making it attractive for educators who need to produce supplemental materials efficiently. The lack of a built‑in chat widget or memory feature means that Copy.ai is best used as a content generator rather than an interactive study companion.

Writesonic is a versatile AI writing assistant that offers tools for creating educational content, such as study guides, flashcards, and multiple‑choice questions. The platform provides a free tier with limited usage and a Pro plan at $19/month, making it accessible for students and teachers on a budget. Writesonic’s AI leverages GPT‑style models to generate text based on user prompts, and it includes a simple interface with a template library for quick content creation. While Writesonic does not include a knowledge graph or real‑time chat capabilities, it excels at producing high‑quality text that can be repurposed into study materials. Its main limitation is that it requires additional work to transform generated content into interactive learning experiences.

Khanmigo is an AI tutor developed by Khan Academy, specifically designed to support learners across K‑12 and college subjects. Built on GPT‑style models, Khanmigo offers conversational explanations, step‑by‑step problem solving, and the ability to scaffold learning based on a student’s progress. The platform is tightly integrated with Khan Academy’s vast repository of lessons and exercises, enabling it to pull in contextual resources and provide personalized guidance. Khanmigo is free for Khan Academy students and teachers, making it an attractive option for anyone already using the platform. While it does not expose a traditional knowledge graph, its integration with structured content from Khan Academy ensures that answers are grounded in curriculum standards. Its strength lies in the seamless blend of AI assistance with a proven curriculum, though it does not offer custom brand‑aligned chat widgets or long‑term memory outside the Khan Academy ecosystem.

Socratic is a mobile app developed by Google that assists students with homework by providing explanations, step‑by‑step solutions, and resource links. The app uses AI to interpret uploaded photos of questions or typed queries and then searches its knowledge base to provide answers. Socratic covers subjects such as math, science, history, and literature, offering a visual and conversational learning experience. While Socratic does not feature a knowledge graph, its AI can retrieve relevant information from Google’s indexed resources. The app is free for all users on iOS and Android, and it includes an in‑app purchase for premium features such as advanced search filters. Its portability and instant answers make it a handy tool for on‑the‑go learners, but it lacks the depth of a structured course or the ability to track progress over time.