Grading is the part of teaching that scales worst — a single essay assignment can mean a lost weekend, and the feedback students most need is the slowest to write. AI grading tools promise to cut that time without turning feedback into a rubber stamp, and in 2026 the good ones keep the teacher firmly in the loop. But they do different jobs: structured rubric marking, real-time formative checks, essay feedback, and browser-based commenting are not the same tool. This guide compares Gradescope, MagicSchool, Brisk, and Snorkl on real 2026 pricing and where each earns its place — plus the honest limits you must respect. Part of our wider guide to AI tools for teachers.
The math: Time to set up ~1 hour · Tasks helped: rubric marking, feedback comments, formative checks, flagging AI-written work · Real cost ranges $0 to a few dollars per student. Pricing changes often — confirm current numbers on each tool's site, and check your district's data-privacy rules.
Here's the thing that separates good AI grading from a liability: the best tools speed up feedback while keeping the teacher deciding the grade. AI is reliable at the mechanical parts — checking answers against a rubric, drafting comment starters, catching missing steps — and unreliable at judgment: nuance, voice, an unconventional-but-correct argument, or the context of a struggling student. Tools that let you review and override before anything reaches a student are the safe ones. Tools that auto-assign final grades without oversight are a fairness and accountability risk you shouldn't take.
So the category splits by task. Rubric marking (Gradescope) applies a consistent rubric across many papers. Feedback drafting (MagicSchool, Brisk) writes comment starters you edit. Formative checks (Snorkl) give students instant low-stakes feedback so you can grade less summatively. Match the tool to the task, and keep your hand on the grade.
| Tool | Best for | Starting price | Standout | The honest catch |
|---|---|---|---|---|
| Gradescope | Rubric-based marking | ~$1–$3/student | Consistent marking at scale | Usually an institution purchase |
| MagicSchool | Free feedback drafting | Free tier | Feedback + rubric generators | Not a dedicated grading engine |
| Brisk | Google Docs feedback | Free forever (individual) | Comments where students write | Best only in a Google workflow |
| Snorkl | Real-time formative | Free tier / paid | Instant feedback on responses | Formative, not summative grading |
Ordered from the free feedback tools up to the institutional rubric engine.
MagicSchool's grading value sits inside its broader suite: free tools that draft student feedback, generate rubrics, and produce comment starters aligned to a standard, which you then edit and apply. It's not a dedicated grading engine that marks a stack of scanned papers — it's a feedback-drafting assistant that removes the blank-page part of commenting.
Who it fits: teachers who want faster, more consistent written feedback without a paid grading platform. What it does well: turning "I need to comment on 30 essays" into editable, specific draft feedback, free. Where it falls short: it doesn't ingest and auto-mark scanned assessments the way Gradescope does, so it's a feedback aid, not a marking engine. Pricing: free tier; paid Plus for higher limits. See our lesson plan generators guide for its planning side.
Brisk works as a browser extension inside Google Docs and Classroom, so it can generate feedback and suggested comments directly on the document a student wrote in. Its "free forever" individual tier includes feedback tools plus a writing-process replay that flags likely AI-generated student work — increasingly useful as students use AI themselves.
Who it fits: teachers in Google Workspace schools who want feedback layered onto the docs students already use. What it does well: commenting in context without exporting anything, plus the AI-writing detection replay. Where it falls short: its value is tied to the Google ecosystem, and, like all AI-detection features, the replay is a signal to investigate, not proof — never accuse a student on the tool's say-so alone. Pricing: free forever for individuals; premium quote-based.
Snorkl takes a different angle: instead of grading finished work, it gives students real-time feedback on their spoken or visual responses (explaining their reasoning, showing their work), so learning happens in the moment and you grade fewer things summatively. It has a free tier for teachers, with paid options for more classes and features.
Who it fits: teachers who want low-stakes, immediate formative checks — especially for reasoning, math work, or verbal explanation. What it does well: instant feedback that helps students improve before a summative grade, reducing the marking pile. Where it falls short: it's a formative tool, not a summative grading engine, so it complements rather than replaces rubric marking. Pricing: free tier; paid upgrades.
Gradescope is the established platform for structured, rubric-based grading — you upload scanned or digital submissions, build a rubric once, and apply it consistently across every paper, with AI assistance for grouping similar answers and speeding repetitive marking. Pricing is typically per student per course, roughly $1/student for the basic tier up to about $3/student for AI features, and it's usually purchased at the department or institution level rather than by an individual teacher.
Who it fits: higher-ed and larger secondary courses grading many structured assessments against a rubric. What it does well: consistency at scale — the same rubric applied identically to paper 1 and paper 200 — and fast handling of repetitive question types. Where it falls short: it's an institutional purchase, not a casual free tool, and its strength is structured answers; open, creative writing still needs substantial human judgment. Pricing: ~$1–$3/student, usually institution-bought.
An individual teacher can do a lot for free: MagicSchool and Brisk both offer free feedback and rubric tools, and Snorkl has a free tier for formative checks. Paid spend usually happens at the institution level — Gradescope at roughly $1–$3 per student per course, or MagicSchool/Brisk premium bought school-wide. If you're paying out of pocket as one teacher, you rarely need to: the free tiers cover feedback drafting and formative work, and heavy rubric marking at scale is exactly the case to take to your department for an institutional license.
If your grading is mostly short, objective quizzes, your LMS's built-in auto-grading already handles it — you don't need a separate AI tool. If you teach a small class, the setup time may exceed the marking time you'd save. And never run grading tools on student data your district hasn't approved. Use AI to draft feedback and check structure, but keep final grades and integrity decisions human — the same principle in our teachers guide.
For structured rubric marking at scale, Gradescope. For free feedback drafting, MagicSchool or Brisk. For real-time formative checks, Snorkl. The right pick depends on whether you're marking many structured papers or speeding up written feedback.
It can apply a rubric consistently and draft useful feedback, but it struggles with nuance, voice, and unconventional-but-correct arguments. Use it to speed feedback and structure marking, and keep the final judgment yourself.
It's fair when a teacher reviews and can override every AI suggestion before it reaches a student. It's not fair — or accountable — to auto-assign final grades without human oversight. Keep yourself in the loop.
Some, like Brisk's writing-process replay, flag likely AI-generated work — but detection produces false positives and is never proof. Treat a flag as a reason to look at the student's drafts and process, not as grounds for an automatic penalty.
Individual teachers can use free tiers (MagicSchool, Brisk, Snorkl) for feedback and formative work. Rubric marking at scale via Gradescope runs about $1–$3 per student and is usually an institutional purchase.