Every tool below has a genuinely useful free tier. Pick by your need — or combine two or three for a complete free study system.
Best overall for revision. Upload your notes, get study guides, quizzes and audio summaries — completely free.
Read review →Best AI tutor. Step-by-step explanations, practice questions and essay feedback for every subject.
Read review →Best for Google users. AI inside Docs, Gmail and Search with great Hindi support.
Read review →| Tool | Rating | Free tier | Best for | Review |
|---|---|---|---|---|
| 📓 NotebookLM | ⭐ 4.9 | Completely free | Revising your own notes & PDFs | Review → |
| 💬 ChatGPT | ⭐ 4.8 | Generous free tier | Explanations, tutoring, practice | Review → |
| ✨ Google Gemini | ⭐ 4.7 | Generous free tier | Docs/Gmail users, Hindi support | Review → |
| 🔍 Perplexity AI | ⭐ 4.6 | Free with daily limits | Research with citations | Review → |
| ✍️ Grammarly | ⭐ 4.6 | Good free tier | Essay proofreading | Review → |
| 🃏 Knowt | ⭐ 4.5 | Very generous free | Flashcards from your notes | Review → |
| 📐 Photomath | ⭐ 4.5 | Good free tier | Math step-by-step | Review → |
| 📇 Quizlet | ⭐ 4.4 | Free basics | Shared flashcard decks | Review → |
| 🗂️ Notion AI | ⭐ 4.3 | Free app; AI limited | Organizing notes & semester | Review → |