The best free AI tools for teachers are not the ones with the longest feature lists — they are the ones that save you time on a real job, this week, without asking for your credit card. This guide covers six tools that do exactly that, all with free plans that cover the work in our guides. No tool here requires a paid plan for the jobs described.
One rule before the list: one tool per job. Teachers who try six tools in one week end up using none of them well. Pick the job that eats most of your time, pick the tool for that job, and use it for two weeks before you add another.
How to choose (2 minutes)
Match the tool to the job, not the other way round:
- Planning lessons and writing questions — ChatGPT.
- Working inside Google Classroom, Docs, and Gmail — Gemini.
- Turning class materials into study guides — NotebookLM.
- Making worksheets look good — Canva.
- Quizzes that grade themselves — Quizizz.
- Long documents and essay feedback — Claude.
If you only have time for one tool, start with ChatGPT if you plan lessons, or Gemini if your school lives in Google Classroom. The rest can wait.
ChatGPT — best for lesson plans and questions
ChatGPT is the most flexible tool on this list. It drafts lesson plans, writes quiz and worksheet questions, differentiates activities, and drafts parent emails — all from a plain English prompt.
- Best at: anything that starts as text. Lesson plans, questions, rubrics, feedback drafts, emails.
- What is free: the free plan covers everyday teaching work. You get the current free model with generous daily use; heavy users hit limits and wait, but a teacher writing a few plans a day will rarely notice.
- Watch out for: confident mistakes, especially in maths, science, and history. Check every fact and every answer before it reaches students.
- Start here: our guide to creating a lesson plan in 10 minutes.
Gemini — best for Google Classroom teachers
Gemini lives in the same Google account as your Classroom, Docs, Sheets, and Gmail. If your school uses Google Workspace, it is the closest assistant you have — no new account, no copying text between apps.
- Best at: drafting assignments in Docs, summarizing readings, writing parent emails in Gmail, and working from materials already in Google Drive.
- What is free: the Gemini app is free. The built-in features inside Docs and Classroom depend on your school’s Workspace edition and your admin’s settings.
- Watch out for: student access depends on admin settings and age restrictions. Do not set homework that needs Gemini until you know your students can use it.
- Start here: our guide to using Gemini in Google Classroom.
NotebookLM — best for study guides from your own materials
NotebookLM is the only tool on this list that answers only from the materials you give it. Upload a textbook chapter, slides, and a video link, and it builds a study guide, flashcards, and a quiz that match what you actually taught.
- Best at: study guides, revision materials, and summaries grounded in your own sources.
- What is free: the whole core product is free with a Google account, including up to 50 sources per notebook.
- Watch out for: it needs readable text — scanned PDFs with no text layer do not work. And only upload materials you have the right to share.
- Start here: our guide to making study guides with NotebookLM.
Canva — best for making worksheets look good
Canva does not write your questions — it makes them look like a real worksheet. Templates, clean layouts, and one-click PDF export turn a wall of pasted text into something students can actually use.
- Best at: worksheet layout, headers, posters, and presentation slides.
- What is free: templates, text, shapes, and PDF download are all free. Paid features exist, but nothing in a standard worksheet needs them.
- Watch out for: busy templates with heavy graphics waste ink and distract students. Pick the plainest template that works.
- Start here: our guide to creating worksheets with ChatGPT and Canva.
Quizizz — best for quizzes that grade themselves
Quizizz turns questions into an interactive quiz students play on their own devices, with auto-grading and a report that shows exactly which questions the class got wrong.
- Best at: low-stakes quizzes, revision games, and finding out what to reteach.
- What is free: creating quizzes, assigning them, auto-grading, and reports are all free for teachers.
- Watch out for: a quiz is only as good as its questions. Generate them with ChatGPT or Gemini first, check the answers, then build the quiz.
- Start here: our guide to making a quiz with AI.
Claude — best for long documents and essay feedback
Claude is built for long documents. It handles a full essay, a long chapter, or a set of marking criteria without losing track — which makes it the best tool here for essay feedback and for working with long readings.
- Best at: feedback on long essays, summarizing long documents, and drafting from detailed rubrics.
- What is free: the free plan covers everyday use with daily limits. Heavy users hit the limit and wait until it resets.
- Watch out for: like every AI tool, it invents quotes and facts. Check every example it gives against the real text — and never let it decide a grade.
- Start here: our guide to grading essays faster with AI.
Quick comparison
| Tool | Best for | Free plan | Watch out for |
|---|---|---|---|
| ChatGPT | Lesson plans, questions, emails | Free, generous daily use | Confident mistakes — check facts |
| Gemini | Google Classroom and Docs work | App free; built-in features depend on school | Student access depends on admin |
| NotebookLM | Study guides from your sources | Free, up to 50 sources per notebook | Needs readable text, not scans |
| Canva | Worksheet layout and PDF export | Templates and PDF free | Busy templates waste ink |
| Quizizz | Self-grading quizzes and reports | Free for teachers | Quiz quality depends on questions |
| Claude | Long essays and long documents | Free with daily limits | Invents quotes — check them |
Where to start (5 minutes)
- Pick the job that eats most of your time this week. Lesson planning? Start with ChatGPT. Quizzes? Start with Quizizz and ChatGPT together.
- Use that one tool for two weeks, on real work, before you add another. Two weeks is enough to know whether it actually saves you time.
- Save your best prompts in one document. A prompt that worked once is worth keeping — next time, you only change the topic.
- Share what works with one colleague. A tool spreads through a staffroom one teacher at a time, and the second teacher always learns faster than the first.
Common mistakes to avoid
- Trying six tools in one week. You will learn none of them. One tool, one job, two weeks.
- Paying for a plan you do not need. Every guide on this site works with free plans. If a tool asks for your card, you are in the wrong place.
- Pasting student names and personal data into AI tools. Remove names first, and check your school’s AI policy before you paste any student work.
- Trusting AI output without checking it. Every tool on this list makes confident mistakes. The teacher is the editor — always.
- Collecting tools instead of finishing jobs. A tool you open once a month is not saving you time. A tool you use every day is.
FAQ
Are these tools really free?
Yes, for the jobs in this guide. Every tool here has a free plan that covers everyday teaching work. Free plans have limits — daily message caps, for example — and those limits change, so check the current pricing page before you rely on a specific feature.
Which tool should I try first?
ChatGPT if you plan lessons and write questions, Gemini if your school lives in Google Classroom. Either one covers the most common teaching jobs, and both are free to start.
Do I need the paid plans?
No — not for anything in the guides on this site. Paid plans buy speed, higher limits, and extra features. Try the free plan for a month first; you will know by then whether you need more.
Is student data safe with these tools?
It depends on your school’s policy and on what you paste. Never paste student names, grades, or personal information into a free AI tool without checking your school’s rules first. When in doubt, anonymize the work — remove names — before you paste anything.
