Two thirds of high school teachers used AI for their work last school year, according to Gallup and the Walton Family Foundation. That is the highest adoption of any grade band, and no wonder: five sections of 30 essays and three different preps will make anyone curious about automation. But high school has a complication that elementary does not. Your students use AI every day, whether you sanction it or not. So choosing tools for grades 9-12 is really two questions: which tools give you your evenings back, and which ones your students can legally and safely touch. This guide answers both. It is written for high school teachers (secondary teachers, for UK readers) picking their stack for the fall semester, and for the department heads who have to sign off on it.
How I chose the tools
I started from the 50 tools in the aieducator.tools directory that explicitly cover grades 9-12, drawn from categories including assessment and grading, lesson planning and resource creation and writing feedback and academic integrity. Each was weighed on five things: fit for a job high school teachers have, evidence of classroom use, safety posture (declared FERPA and COPPA status, data hosting, minimum age, independent security assessment), honest pricing, and whether it keeps the thinking with the teacher and the student.
Nobody pays to appear here and vendors cannot buy placement. I left out the two tools in the pool that do not state where they host student data, and I left AI detection tools out on principle, because detection is a losing game. You will also notice MagicSchool, Brisk Teaching and Diffit are not re-listed. They are capable tools that already lead every vendor round-up; this post is about what the 9-12 data supports beyond the usual names. Pricing and features verified 26 August 2026.
The 9-12 Pool, by the Numbers
The directory data tells you something vendor lists never will. Of the 50 tools covering grades 9-12: only 3 carry an independent 9ine security assessment. 22 declare FERPA compliance and 18 declare COPPA. 21 host data in the US, 10 in the UK, 12 in the EU, and 2 do not say. 31 collect student data in some form. And 11 set a minimum user age of 18, which makes them teacher-only tools regardless of what the marketing implies.
The first question in a high school classroom is not which AI tool is best. It is who is allowed to touch it.
The table below shows the vendor's own declared compliance, not an audit. The 9ine column is the independent one.
| Tool | Best for | Pricing | Grades | Min age | Privacy (declared) | Data hosted | Independent security assessment |
|---|---|---|---|---|---|---|---|
| EnlightenAI | Grading writing against rubrics | Freemium | K-5, 6-8, 9-12, Higher ed | 8+ | FERPA, COPPA, GDPR | UK | Yes (9ine) |
| Knowt | Student study and AP prep | Freemium | All grades | No minimum | FERPA, COPPA, GDPR | US | Yes (9ine) |
| TeachAid | Building standards-aligned units | Freemium | All grades | 18+ | FERPA, COPPA, GDPR | US | Yes (9ine) |
| SchoolAI | Monitored student-facing AI | Freemium | All grades | No minimum | FERPA, COPPA (GDPR in progress) | US | No |
| SayVeritas | Assessment students cannot outsource | Paid | K-5 to Higher ed | 8+ | FERPA, COPPA, GDPR | EU | No |
| SlidesAI | Turning notes into slide decks | Freemium | All grades | 13+ | FERPA, COPPA, GDPR | US | No |
Best for grading writing: EnlightenAI
If essay feedback is eating your weekends, EnlightenAI is the strongest rubric-first option in the pool. You load your own rubric, it drafts scores and written feedback against it, and you review before anything reaches a student. It plugs into Google Classroom, Canvas and Clever, and it surfaces class-level patterns you can turn into reteaching material with one click. What sets it apart from Brisk Teaching's inline approach is the teacher-in-the-loop scoring: nothing goes out ungraded by a human, which keeps the judgement where it belongs. It is one of only three tools in this pool with an independent 9ine security assessment, declares FERPA, COPPA and GDPR compliance, hosts data in the UK, and does not share student data with third parties. Watch out for the pricing: there is a free tier, but the company publishes no public price list, so school pricing is quote-based (checked 26 August 2026). Best for English, history and science teachers with heavy writing loads. Not for anyone who wants fully automatic grading, which is precisely the point.
Best for student study and AP prep: Knowt
Knowt is the tool I would put directly in students' hands for revision. It combines flashcards with spaced repetition, AI-generated practice assessments, live class games, and a library of over five million study resources covering AP, SAT, IB and GCSE. Teachers get monitored AI chat activities and auto-graded assessments on the same platform. Against Quizlet, the obvious comparison, Knowt's free tier is far less restricted and it imports your existing Quizlet sets in minutes. It has no minimum age, declares FERPA, COPPA and GDPR compliance, hosts data in the US, holds a 9ine assessment, and does not share data with third parties. Watch out for the student-first design: the interface is built for teenagers, and the teacher management layer is younger and rougher than the study side. Free tier is substantial; Ultra runs $12.49 per month billed annually at $149.99, or $24.99 month to month (verified 26 August 2026). Best for AP and exam-heavy courses. Not for teachers who want a locked-down, teacher-controlled environment. I compared more options in my revision and exam prep tools guide.
Best for building units: TeachAid
TeachAid generates complete, standards-aligned units, not just single lessons, with differentiation and IEP supports built into the paid tier. You give it your standards and context; it returns a teachable sequence with resources and assessments you then edit. That is the right division of labour: the tool does the assembly, you keep the sequencing and judgement. Compared with MagicSchool's toolbox of 80 small generators, TeachAid goes deeper on one big job. It holds a 9ine assessment and declares FERPA, COPPA and GDPR compliance, with US hosting. Note the minimum age: 18+. This is a teacher-only tool, one of 11 in the 9-12 pool, so nothing here goes in front of students directly. Watch out for the temptation to teach a generated unit unedited; the drafts are scaffolds, not finished curriculum. The free tier covers unit and lesson generation; Premium is $15 per month or $100 per year, with quote-based enterprise licensing (verified 26 August 2026). Best for teachers with a new prep or a curriculum rewrite. Not for quick one-off worksheets.
Best for student-facing AI with guardrails: SchoolAI
If you want students talking to an AI without losing sight of the conversation, SchoolAI is built for exactly that. Teachers create Spaces, custom tutors with teacher-set guardrails, and watch every student conversation in real time, with automated alerts when something concerning appears. It is the most complete monitoring model in this pool and the reason the tool carries a 4.9 rating from reviewers on our directory. Against Khanmigo, the other big name in supervised tutoring, SchoolAI gives the teacher far more control over what the AI will and will not discuss. Now the caveats, and they matter: it declares FERPA and COPPA compliance with SOC 2 certification, but GDPR compliance is listed as in progress, and the directory records that it shares some data with third parties, so put it through your district's data privacy agreement process before rollout; my compliance guide for schools walks through how. The free tier is five Space launches per year, enough to trial but not to run a classroom; Pro and Scale are quote-based (verified 26 August 2026). Best for schools that want student AI use in the open. Not for teachers hoping for a free everyday tool.
Best for assessment students cannot outsource: SayVeritas
Here is the contrarian pick. Rather than trying to catch AI-written work after the fact, SayVeritas sidesteps the problem: students explain their thinking out loud, asynchronously, on any device, and the platform transcribes, asks Socratic follow-up questions, and drafts scores against Bloom's-aligned rubrics that you approve. Oral assessment is the oldest integrity technology there is; this makes it workable at the scale of a 150-student caseload. It declares FERPA, COPPA and GDPR compliance, hosts in the EU, and collects no student data by its own declaration. Watch out for its youth: the platform launched in 2026, access currently runs through a waitlist, and the credit-based pricing needs budgeting rather than a flat subscription. A Starter pack is $15 one-time for 250 assessment credits, a Classroom pack $29 for 600, and school licences are custom (verified 26 August 2026). Best for teachers rethinking assessment where essays no longer prove learning. Not for anyone needing a mature, plug-and-play platform this semester.
Best for slide decks: SlidesAI
SlidesAI does one thing: it turns text or a topic into a formatted deck inside Google Slides or PowerPoint, in over 100 languages. For a teacher who lectures from slides across three preps, that is hours back per week. Against Gamma, the design-led alternative, SlidesAI wins on living inside the tools your school already uses rather than another platform to manage. It declares FERPA, COPPA and GDPR compliance, hosts in the US, collects no student data, and has a minimum age of 13. Watch out for the free tier reality: 12 presentations per year with a 1,000-character input cap, which is a demo, not a plan. Pro is $10 per month billed annually at $120 and lifts you to 120 presentations; Premium is $20.83 per month billed at $250 per year for unlimited decks (verified 26 August 2026). Best for lecture-heavy subjects and last-minute cover lessons. Not for teachers who barely present, or who need design flourish.
How to Choose
My rule for every AI purchase is the same: outsource the doing, not the thinking. Grading mechanics, deck assembly, unit scaffolding and flashcard generation are doing. Deciding what feedback a student needs, what sequence a course follows and what an assessment should prove is thinking, and every tool above was chosen because it leaves that with you.
Cognitive stretch is the other test: the amount of thinking a task still asks of the student after the tool has done its part. A tool that writes the essay removes the stretch. A tool that questions the student about their essay increases it.
Three if-then rules for a department head. If a tool will touch students, check the minimum age against your roster first; 11 of the 50 tools in this pool are 18+ and off the table for student use entirely. If it collects student data, ask where it is hosted and whether you can request deletion before you ask what it costs. And if the vendor's compliance page is all self-declaration, ask whether an independent assessment exists; only 3 of 50 in this pool have one.
What I'd Do This Week
Pick one class and one pain point, not six tools. If it is grading, run one essay set through EnlightenAI's free tier alongside your normal process and compare the feedback quality. If it is revision, have one class import their Quizlet sets into Knowt before the first unit test. Measure one thing: hours saved, or the quality of what students produced. Then decide with evidence instead of enthusiasm, and take the result to your department meeting.
What I would do
For grades 9-12 in 2026: EnlightenAI for grading writing, Knowt for student study, TeachAid for unit planning, SchoolAI for supervised student AI, SayVeritas for assessment that cannot be outsourced, and SlidesAI for decks. Check the minimum age before anything reaches a student, and check the hosting before anything reaches procurement. The full pool, with the compliance data behind every claim here, is in the aieducator.tools directory. Your evenings are worth getting back; your students' thinking is worth keeping.
Dan Fitzpatrick is a Forbes contributor, three-time bestselling author and founder of The AI Educator, with 150,000+ educators trained across 30+ countries.