SAT Climb

SAT Climb is digital SAT prep that maps all 31 SAT skills, diagnoses your weak spots, and drills them from a bank of over 17,500 questions while your projected score climbs. It includes 20 full-length timed exams and 20 mini mocks built to official Digital SAT specifications. 7-day free trial.

Chinese Trainer

Chinese Trainer: Master Mandarin with HSK Structure and AI Support Chinese Trainer is a comprehensive online platform designed to help learners master Mandarin Chinese, specifically tailored for success on the HSK (Hanyu Shuiping Kaoshi) exams. It provides a structured learning path, integrating vocabulary, grammar, and readings, all reinforced by an intelligent spaced repetition system and an AI tutor. This SAAS is ideal for anyone from absolute beginners (HSK 1) to advanced learners (HSK 7+), including university students, engineers, and self-learners, who are serious about building a strong foundation in Chinese and passing the official HSK examinations. Key Features: Extensive HSK Vocabulary: Access to 12,432 public HSK words, covering HSK 1-6 and the 2021 advanced bands (HSK 7+). Spaced Repetition System (SRS): Efficiently review due cards when you're most likely to forget them, ensuring long-term retention. AI Tutor: Engage in text chat for practice, receive sentence corrections, and generate custom readings at your level (paid plans). Graded Readings & Listening: Study with 204 graded texts and dialogues, complete with audio to enhance comprehension. Multi-Modal Practice: Beyond flashcards, practice writing, tones, listening, speaking, sentence ordering, matching, and dictation. Daily Learning Queue: A personalized daily plan, skill stats, and a streak counter to maintain consistency. Use Cases: Chinese Trainer excels as a primary study tool for individuals preparing for any level of the HSK exam. Its structured curriculum ensures learners progress systematically through vocabulary and grammar, making the daunting task of learning Chinese manageable and rewarding. Students can use it to supplement their university courses, while self-learners can rely on its comprehensive path to guide their studies from scratch. The platform is particularly beneficial for those struggling with consistency or fear of producing Chinese. The daily review queue helps establish a routine, and the AI tutor provides a safe, non-judgmental space to practice writing full sentences and receive immediate feedback, boosting confidence and accelerating learning. It also serves as an excellent resource for improving listening comprehension and reading fluency through its extensive library of graded texts and dialogues. Pricing Information: Chinese Trainer operates on a freemium model. HSK 1-2 content is available for free, with daily limits (3 uses/day per feature, 3 tutor messages). Paid plans start at €5/month, offering full access and advanced AI tutor features, with a 7-day free trial. Subscriptions can be canceled at any time via the Stripe customer portal. User Experience and Support: The platform offers a clean, intuitive user interface accessible via browser and a dedicated Android app, with progress syncing seamlessly between devices. Users can sign in easily with Google or email and either take a placement test or select their starting HSK level. A comprehensive FAQ section addresses common queries, ensuring users have access to necessary information. Technical Details: While specific programming languages or frameworks are not detailed, Chinese Trainer is a web-based application with a native Android app, indicating a robust, cross-platform architecture designed for accessibility and performance. Pros and Cons: Pros: Structured HSK learning path, highly effective Spaced Repetition System, interactive AI tutor for personalized practice, comprehensive multi-modal exercises, graded readings with audio, cross-platform availability (web & Android), free tier for beginners. Cons: iOS app is still in development, free tier has daily usage limits, AI tutor, while useful, should be treated as practice and not an official rater. Conclusion: Chinese Trainer offers an exceptionally well-rounded and effective solution for learning Mandarin Chinese, especially for those aiming for HSK certification. Its blend of structured content, intelligent review, and AI-powered assistance makes it a powerful tool for consistent progress. Start your journey today and experience a coherent and engaging way to master Chinese.

NudgeEssay

NudgeEssay gives college and grad school applicants admissions-style feedback on their essays. Paste a Common App personal statement, supplemental, or grad school essay and get line-by-line comments, rubric scoring on voice, specificity, and memorability, a prioritized revision plan, and cliche and AI-pattern screening. It never writes the essay for you. A free first read shows your verdict before you pay.

NudgeLearn

NudgeLearn is a free AI grader for teachers and parents. Snap a photo of a math worksheet or upload an essay, and it marks every answer and explains every mistake, from multiple choice to full-length essays. It also offers printable worksheets and self-paced math lessons. Free to start, with a Pro plan for heavier use.