How this comparison was made
The comparison uses current public documentation from each provider, checked on July 19, 2026. Criteria were usefulness for notes, recall, quizzes, planning, cross-device access, setup effort, privacy controls, and meaningful free access. We did not conduct a controlled user study and do not claim first-hand testing of every product. Free plans can change, so confirm limits on the provider’s website before committing your workflow.
Ownership disclosure: Mindley is the product publishing this guide. It is listed last and its small free upload allowance is stated alongside its advantage. No placement was paid for.
Quick comparison
| Tool | Best for | Main free value | Important limitation |
|---|---|---|---|
| Google Calendar | Revision planning | Events, tasks, multiple calendars, sharing, and basic offline viewing. | Advanced appointment features require eligible paid plans; mobile web has feature limits. |
| Anki | Long-term flashcard review | Free desktop apps, AnkiWeb sync, media cards, scheduling, and community add-ons. | The official iOS app is paid; setup and card design require effort. |
| NotebookLM | Source-grounded exploration | Notebooks with source chat, reports, audio, flashcards, quizzes, and mind maps. | Standard access currently lists 100 notebooks, 50 sources per notebook, 50 chats per day, and feature-specific daily limits; limits can change. |
| Google Docs | Collaborative notes | Document writing, formatting, sharing, comments, and automatic saving with a Google account. | Gemini features require an eligible plan or experiment; Docs alone does not provide a dedicated recall workflow. |
| Obsidian | Private linked notes | The app is free for personal, commercial, and non-profit use; local Markdown notes and community plugins are available. | Official Sync and Publish are optional paid services; setup is self-directed. |
| Zotero | Research references | Open-source reference management, citation capture, collections, notes, and library syncing. | Free online file storage is limited; larger attachment syncing requires paid storage or another setup. |
| Notion | Organized study dashboards | Free individual workspace for notes, databases, tasks, and templates. | Free collaboration and file features have plan limits; Notion AI use on Free is a limited trial. |
| RemNote | Notes connected to flashcards | Linked notes, flashcards, spaced repetition, and limited-use access to some Pro features. | PDF annotation and AI features have free-use limits; specific limits can change. |
| Quizlet | Ready-made flashcard practice | Free accounts can use flashcards, practice questions, diagrams, and activities. | Study Guides, Learn, Test, offline study, and extended premium access require a subscription or have limits. |
| Mindley | One source-to-revision workflow | One lifetime study-set creation with notes, flashcards, quizzes, fill-in-the-blanks, tests, mind maps, and tutor tools. | The Free plan currently has a 10 MB source limit and one successful study set; AI output needs verification. |
Detailed notes on each free study tool
01
Google Calendar
- Best use
- Revision planning
- Free access
- Events, tasks, multiple calendars, sharing, and basic offline viewing.
- Main advantage
- Simple scheduling across web and mobile.
- Main drawback
- Does not create or test study content.
- Platforms
- Web, Android, iOS
- Ideal user
- Students who already know what to study and need a schedule.
Testing note: documentation review only; no first-hand testing claim is made for this product.
02
Anki
- Best use
- Long-term flashcard review
- Free access
- Free desktop apps, AnkiWeb sync, media cards, scheduling, and community add-ons.
- Main advantage
- Flexible spaced repetition and large decks.
- Main drawback
- Not a guided notes-to-practice workflow.
- Platforms
- Windows, macOS, Linux, web, Android; paid iOS app
- Ideal user
- Students willing to build and maintain precise cards.
Testing note: documentation review only; no first-hand testing claim is made for this product.
03
NotebookLM
- Best use
- Source-grounded exploration
- Free access
- Notebooks with source chat, reports, audio, flashcards, quizzes, and mind maps.
- Main advantage
- Answers can reference uploaded sources.
- Main drawback
- The broad workspace can be more than a student needs for a quick review set.
- Platforms
- Web, Android, iOS
- Ideal user
- Students comparing or questioning several source documents.
Testing note: documentation review only; no first-hand testing claim is made for this product.
04
Google Docs
- Best use
- Collaborative notes
- Free access
- Document writing, formatting, sharing, comments, and automatic saving with a Google account.
- Main advantage
- Familiar editing and real-time collaboration.
- Main drawback
- Practice tools must be created separately.
- Platforms
- Web, Android, iOS
- Ideal user
- Students writing or sharing class notes.
Testing note: documentation review only; no first-hand testing claim is made for this product.
05
Obsidian
- Best use
- Private linked notes
- Free access
- The app is free for personal, commercial, and non-profit use; local Markdown notes and community plugins are available.
- Main advantage
- Local files and flexible linked knowledge bases.
- Main drawback
- Can require significant configuration before it feels simple.
- Platforms
- Windows, macOS, Linux, Android, iOS
- Ideal user
- Students who want control over a long-term personal knowledge base.
Testing note: documentation review only; no first-hand testing claim is made for this product.
06
Zotero
- Best use
- Research references
- Free access
- Open-source reference management, citation capture, collections, notes, and library syncing.
- Main advantage
- Strong source and citation organization.
- Main drawback
- Not designed for quizzes or active-recall sessions.
- Platforms
- Windows, macOS, Linux, web, iOS, Android
- Ideal user
- Research students managing papers and citations.
Testing note: documentation review only; no first-hand testing claim is made for this product.
07
Notion
- Best use
- Organized study dashboards
- Free access
- Free individual workspace for notes, databases, tasks, and templates.
- Main advantage
- Flexible organization in one visual workspace.
- Main drawback
- Building a good study system can take time.
- Platforms
- Web, Windows, macOS, Android, iOS
- Ideal user
- Students who want notes, tasks, and course tracking together.
Testing note: documentation review only; no first-hand testing claim is made for this product.
08
RemNote
- Best use
- Notes connected to flashcards
- Free access
- Linked notes, flashcards, spaced repetition, and limited-use access to some Pro features.
- Main advantage
- Recall is built directly into the note structure.
- Main drawback
- The learning curve is steeper than a simple flashcard app.
- Platforms
- Web, Windows, macOS, Linux, Android, iOS
- Ideal user
- Students who want detailed notes and repetition in one system.
Testing note: documentation review only; no first-hand testing claim is made for this product.
09
Quizlet
- Best use
- Ready-made flashcard practice
- Free access
- Free accounts can use flashcards, practice questions, diagrams, and activities.
- Main advantage
- Fast access to simple study sets and practice modes.
- Main drawback
- Public sets vary in quality and may not match your course.
- Platforms
- Web, Android, iOS
- Ideal user
- Students who want quick flashcard-based review.
Testing note: documentation review only; no first-hand testing claim is made for this product.
10
Mindley
- Best use
- One source-to-revision workflow
- Free access
- One lifetime study-set creation with notes, flashcards, quizzes, fill-in-the-blanks, tests, mind maps, and tutor tools.
- Main advantage
- Connected outputs use the same private study source.
- Main drawback
- The free upload allowance is much smaller than general note-taking tools.
- Platforms
- Web
- Ideal user
- Students who want to test a complete AI-generated revision set from one source.
Testing note: documentation review only; no first-hand testing claim is made for this product.
Choose by the task, not the longest feature list
Use Google Calendar for time, Zotero for sources, Google Docs or Notion for collaborative notes, Obsidian for local linked notes, Anki or Quizlet for cards, RemNote for notes plus repetition, NotebookLM for exploring several sources, and Mindley when you want one source to become a connected revision set. Combining two focused tools can be better than forcing one product to do everything.