The best AI tools for teachers in 2026 save real hours on lesson planning, grading, and differentiation — and the good news is the two strongest options are largely free. Khanmigo is free for US teachers, and MagicSchool covers most core features on a free plan too. You do not need to spend much to get most of the value.
Short answer: Start with Khanmigo (free for US teachers) for lesson planning, tutoring, and assessments. Add MagicSchool (free tier, or about $8.33/month for Plus) if you need its 80+ tools or the standout IEP generator. For grading a lot of writing, CoGrader is the specialist. Do not stack more than about three tools.
Disclosure: AISagely may earn a commission if you sign up through some links here, at no extra cost to you. It never changes the recommendation — most of my top picks for teachers are free, and I say so plainly.
I test AI tools daily as part of my work in AI, and education is one of the areas where these tools have genuinely matured. Below are the ones worth your time, what each is actually good at, and where the free option is all you need. Prices and free tiers shift often, so confirm current terms on each vendor's page before committing.
How I picked these tools
I looked for tools built for real classroom tasks — not general chatbots with a school skin — and I weighted three things: how much time they save on repetitive work (planning, grading, differentiation), whether they respect student data privacy, and whether the free tier is genuinely usable or just bait for an upgrade. I also gave weight to what teachers themselves report, because a tool that looks great in a demo but gets abandoned by week three is not actually useful.
Beyond the criteria, I put the finalists through the same hands-on exercise. In my testing I built three artifacts in each tool: a 45-minute lesson plan on a topic I know well, a grading rubric for a short essay, and a differentiated version of the same reading passage at two levels. Then I compared the drafts for accuracy, structure, and how much fixing they needed before I would put them in front of a class. Tools that produced something usable within a pass or two made this list; tools that needed as much editing as writing from scratch did not.
Top picks at a glance
| Tool | Best for | Price | Free tier |
|---|---|---|---|
| Khanmigo | Planning + student tutoring | Free (US teachers) | Yes, full for teachers |
| MagicSchool | All-in-one, IEPs, 80+ tools | ~$8.33/mo Plus | Yes, most core features |
| CoGrader | Grading writing at scale | ~$8/mo Pro | Free for new users |
| Brisk Teaching | Working inside Google Docs | Free core | Yes, 20+ tools |
| Diffit | Differentiation + translation | Free tier | Yes |
Best free option: Khanmigo
Khanmigo, from the nonprofit Khan Academy, is free for US teachers, and that alone makes it the first tool I recommend. On the teacher side it offers 20+ tools — lesson hooks, exit tickets, rubric generators, quiz questions, and differentiated activities — all aligned to Khan Academy's curriculum. On the student side, its tutoring uses a Socratic method that guides learners with questions instead of handing over answers, which is pedagogically sound.
Two honest limits: you cannot grant students direct access on your own — classroom access runs through school or district implementation — and because the free model depends on philanthropic funding, its long-term terms could change. But for an individual teacher, free and genuinely capable is hard to argue with. See what it offers on the Khanmigo for teachers page. Get started here: Try Khanmigo →.
Best all-in-one: MagicSchool
MagicSchool is the most feature-rich platform built specifically for K-12, with 80+ tools spanning lesson planning, assessment creation, differentiation, behavior plans, and parent-communication drafts. Its lesson planner walks you through grade level, subject, standards, and duration, then produces a structured plan with objectives, activities, and assessment ideas, and it maps to Common Core and state standards natively.
Its genuine standout is the IEP generator: input the disability category, grade level, and performance data, and it drafts a structured IEP with compliant language and SMART goals — no other major teacher tool matches it there. The free plan covers most core features; Plus is about $8.33/month on annual billing (or $12.99 month-to-month) and adds unlimited generations and one-click Google or Microsoft exports. The only reason to pay out of pocket is if you specifically need the IEP generator or the broader tool library. Try MagicSchool here: Try Magicschool →.
Best for grading: CoGrader
If you assign a lot of writing, grading is where AI saves the most time, and CoGrader is built for exactly that. It generates personalized, per-student feedback in seconds and integrates directly with Google Classroom, Canvas, and Schoology, so it fits your existing workflow instead of adding a new one. It is free for new users, with a Pro plan around $96/year (about $8/month). The rule I would keep, though: treat every AI grade and comment as a draft to review, never a final — especially anything involving a number.
Also worth using: Brisk Teaching and Diffit
Brisk Teaching is a Chrome extension that lives inside Google Docs and Slides. It can turn a document into a lesson plan, generate comprehension questions from any article, or adjust a text's reading level without leaving your workflow, and the core extension is free with 20+ tools. Diffit is the go-to for differentiation: paste any text and it produces versions at multiple reading levels with vocabulary lists and comprehension questions, and translates into 70+ languages — a real help for mixed-ability and multilingual classrooms.
If you also want a general assistant for quick drafting and email, a free general model covers a lot; see my guide on how to use ChatGPT for free before paying for anything extra.
Student data privacy: check this before you sign up
Whatever tool you pick, the privacy check matters more than the feature list. Look for three things before creating an account. First, whether the tool publishes student-privacy commitments and aligns with FERPA and COPPA — MagicSchool and Khanmigo both do, which is part of why they lead this list. Second, whether your district has approved it: many districts keep an approved-software list, and using an unapproved tool with student data can put you personally on the hook, so a two-line email to your IT coordinator is worth sending before you invest time. Third, what happens to the text you paste in — if a tool offers a setting to exclude your data from model training, turn it on.
The safest habit costs nothing: never paste student names, grades, or identifying details into any AI tool, on any plan. Use initials or "Student A," and strip identifiers from work samples before uploading them. None of this takes more than a few minutes, and it removes the single biggest risk of classroom AI use.
A realistic first-week rollout
You do not need a summer PD course to start. On day one, sign up for Khanmigo or MagicSchool and generate a lesson plan for something you are already teaching next week — judging AI output is far easier on material you know cold. Day two, make a rubric and an exit ticket for the same lesson. Midweek, try differentiation: take one reading passage and produce two levels of it, plus a translated version if you have multilingual students. By the end of the week, grade one small stack of low-stakes work with CoGrader and compare its comments with what you would have written yourself.
That is enough contact to know which tool fits your subject and your habits — and because you evaluated on real material, you will have produced a week of usable resources while deciding, so the trial costs you nothing. The best AI tools for teachers are the ones still open in November; a week like this tells you early which those will be.
How to choose (and a warning)
The single biggest predictor of whether teachers still use AI later in the year is restraint: those who settle on about three tools keep going, while those who try to run ten at once abandon all of them. So pick a planner (Khanmigo or MagicSchool), a grader if you assign writing (CoGrader), and one differentiation helper (Diffit or Brisk), and stop there. And regardless of tool, verify anything with facts or numbers before it reaches students.
For a broader look at the writing tools behind many of these platforms, see my ranked guide to the best AI writing tools, and if you are choosing between the two biggest AI writers, my Jasper vs Copy.ai comparison. If you also write outside the classroom — a newsletter, grant applications, a side project — my Jasper review covers the strongest brand-voice writing tool. And if you teach computer science, the assistants in my ChatGPT alternatives for coding guide will matter more to your students than any classroom suite.
My verdict
For most teachers paying out of pocket, start with Khanmigo — it is free and covers planning, differentiation, assessment support, and tutoring. Add MagicSchool's free tier for its wider toolset, and only pay for MagicSchool Plus if you need the IEP generator or unlimited generations. If grading writing is your time sink, CoGrader earns its small fee. That combination costs little or nothing and covers the tasks that actually eat your evenings.
Frequently Asked Questions
What is the best free AI tool for teachers?
Khanmigo is the best free option — it is free for US teachers and covers lesson planning, differentiation, assessments, and Socratic student tutoring. MagicSchool's free tier is a strong second, covering most of its core tools.
Is MagicSchool or Khanmigo better?
For depth and breadth of tools (including IEPs), MagicSchool is stronger. For student tutoring and being fully free, Khanmigo wins. Many teachers use both: Khanmigo for tutoring and planning, MagicSchool for its specialized generators.
Can AI grade student work reliably?
AI grading tools like CoGrader speed up feedback dramatically and are good for first-pass comments, but you should treat every AI grade as a draft and review it yourself — accuracy still slips, especially on nuanced or numeric work.
How much do AI tools for teachers cost?
Many are free or nearly free. Khanmigo is free for US teachers, MagicSchool's core is free (Plus is about $8.33/month), and CoGrader is about $8/month. You can build a full workflow for little to no cost.