AI Grading for Google Classroom
Grade an entire class set in minutes, not hours. ClassLens connects directly to Google Classroom to grade student submissions with AI, write personalized feedback, and give you back the time grading takes away.
Built by a teacher with 22 years of classroom experience. Not a tech company guessing at what teachers need.
You Already Know the Problem
You teach five periods. Each class has 30-plus students. A single written assignment generates 150 submissions. At 10 minutes per paper, that is 25 hours of grading for one assignment.
So you make trade-offs. You assign less writing. You give shorter feedback. You push grading to weekends and late nights. You know you could be a better teacher if you were not drowning in a stack of papers every week.
The average teacher spends 9.9 hours per week on grading. Teachers who try to give personalized feedback on every submission are looking at 40-plus hours a week on grading alone. That is not sustainable. It never was.
ClassLens exists because the teacher who built it spent 22 years making those same trade-offs and finally had the tools to fix it.
How ClassLens Works with Google Classroom
ClassLens is not a generic AI tool that happens to support Google Classroom. It was built from the ground up for teachers who live in Google Classroom every day. The entire workflow stays inside the ecosystem you already use.
Step 1: Connect Your Google Classroom
Sign in with your Google account. ClassLens imports your courses, assignments, and student submissions directly from Google Classroom. No CSV uploads, no copy-paste, no switching between platforms.
Step 2: Configure Your Grading Preferences
This is where ClassLens is different from every other AI grading tool. You control the grading, not the AI.
Set your preferences before each grading job:
- Strictness level: Grade leniently, moderately, or strictly. You decide the bar.
- Feedback style: Choose between encouraging, balanced, or direct feedback tones.
- Feedback length: Brief comments or detailed paragraph-level analysis.
- Late work policy: Define how late submissions are handled: full credit, percentage deductions, or zero credit. The AI applies your policy automatically.
- Rubric criteria: Upload your rubric and the AI evaluates each submission point by point against your standards. Not arbitrary ones.
Your preferences are saved and applied to future assignments. Set it once, adjust when you need to.
Step 3: Review and Return
ClassLens grades every submission and saves the results as drafts in Google Classroom. Nothing reaches your students until you approve it.
Review the AI-generated grades and feedback at your own pace. Make adjustments where you see fit. Then return grades to students with a single click, or export everything to Google Sheets for your records.
The AI is the assistant. You are the authority.
What Makes ClassLens Different from Other AI Grading Tools
Most AI grading tools treat Google Classroom as one integration among many. ClassLens treats it as the foundation.
Read more about how ClassLens surfaces class-wide knowledge gaps, or explore a live sample Knowledge Gap Report with no login.
After every grading job, ClassLens aggregates the results across your entire class and generates a Knowledge Gap Report. This tells you what your students understood, where the common misunderstandings are, and which concepts need re-teaching. No other AI grading tool does this.
A veteran AP History teacher grading DBQs needs a different standard than a first-year teacher grading reading responses. ClassLens adapts to the teacher, not the other way around. Strictness, feedback tone, feedback length, late work handling are all configurable.
Essays, short answers, lab reports, handwritten work (photographed or scanned), CAD drawings, student-drawn graphs, PDFs, slides, uploaded audio and video submissions, and multi-file submissions. If a student can submit it to Google Classroom as a document, image, PDF, or uploaded audio or video file, ClassLens can grade it.
Assignments import directly with no manual setup. Grades write back as drafts in Google Classroom. Student submissions are processed in place. The workflow matches what you already do.
ClassLens vs. Google's Native AI Feedback in Classroom
Google rolled out AI-suggested feedback inside Google Classroom in early 2026. It's a useful feature for the teachers who have access to it. Here's how it compares.
Comparison table
Comparison current as of June 2026. Google's native feature is evolving; every row is verified against Google's own documentation at publish and re-checked every 90 days.
| Feature | Google native AI feedback (Gemini in Classroom) | ClassLens |
|---|---|---|
| Available to | Education Plus or Teaching & Learning add-on subscribers | Any Google Classroom teacher (free tier with 100 submissions/month) |
| Grades against your rubric | No (drafts feedback only) | Yes (scores criterion by criterion) |
| Class-wide knowledge gap synthesis | No | Yes (per-assignment, per-criterion, per-period) |
| Batch grading | One submission at a time | 30+ submissions in a single 2-5 minute batch |
| Teacher review before student sees grade | Yes (drafts) | Yes (Batch Review Dashboard) |
| Auto-grade and release without review | No | No (auto-return permanently eliminated 2026-04-12) |
| Knowledge Gap Reports | No | Yes |
Why use ClassLens if you have Google native feedback
Two reasons.
One: Google's feature drafts feedback. It does not grade. A teacher still has to determine the score, weigh it against the rubric, and enter it. ClassLens does the scoring against your rubric in addition to writing feedback; that's the part that takes the hours.
Two: Google's feature is per-student. It writes a comment for one essay at a time. It does not aggregate. After 30 students, you still don't know what your class as a whole missed. The Knowledge Gap Report is the answer to that question, and it doesn't exist anywhere else.
Many teachers use both. Google's drafted feedback is fine for quick formative checks. ClassLens is for the assignments where you actually need scores and class-level diagnostics, the ones that take your evenings now.
We respect the work the Google Classroom team is doing. They built a useful feature. We built a different one, for a different part of the grading workload. To read more about how AI grading should be used responsibly in the classroom, see the ethics of AI grading.
Student Privacy Is Not an Afterthought
If you are a teacher, you know that using a new tool means asking about student data. ClassLens was designed from the start with FERPA compliance built into the architecture.
- Transient processing: Student submissions are downloaded, graded, written back to Google Classroom, and discarded. No student data is stored on ClassLens servers.
- Google Cloud Vertex AI under the Cloud DPA: your data is never used to train Google’s foundation models.
- AES-256 encryption: All sensitive data is encrypted at rest and in transit.
- Teacher-initiated only: Nothing happens without your explicit action.
- School/district authorization: Student data is only processed after proper authorization is in place.
- Data Privacy Agreement ready: ClassLens supports district-level DPAs for formal procurement.
You should not have to choose between using AI and protecting your students. With ClassLens, you do not have to.
Built by a Teacher, for Teachers
ClassLens was not built in a Silicon Valley office by engineers who have never been inside a classroom. It was built by Steven Swanson, a teacher with 22 years of experience who grades 150-plus papers every week.
The features in ClassLens exist because they solve problems Steven faces in his own classroom. Knowledge Gap Reports exist because he wanted to know what his class was missing. Configurable strictness exists because formative check-ins and summative essays require different standards. Draft mode exists because no responsible teacher wants AI sending grades to students unsupervised.
This is a tool built by someone who uses it. Every design decision reflects real classroom experience, not market research.
More on this in our post on the ethics of AI grading.
The Time You Get Back
Here is the math for a teacher with 150 students.
Manual Grading
25 hours
150 papers at 10 minutes each
With ClassLens
~7 hours
AI grades in minutes, review at 2-3 minutes each
Time Saved
18+ hours
Per assignment cycle
Teachers who use AI tools weekly save an average of 5.9 hours per week, the equivalent of six full weeks per school year. And that is the average. Teachers with large class loads save significantly more.
Get Started in Five Minutes
ClassLens requires no installation, no downloads, and no IT department involvement to try.
Sign in with Google
Use your Google account (personal or Workspace).
Select an assignment
ClassLens imports your courses and assignments from Google Classroom.
Set your preferences
Choose your strictness, feedback style, and late work policy.
Grade
ClassLens processes your submissions and saves grades as drafts.
Review and return
Check the AI's work, make adjustments, and return to students.
Every new account starts with a full free month of grading at full volume, no credit card. The clock does not start until you grade your first assignment, and after the month you keep a free plan with 100 submissions/month.
For a deeper walkthrough, read our complete guide to automated grading in Google Classroom.
Frequently Asked Questions
Is ClassLens free?
Yes. The free tier includes 100 submissions per month, enough to grade about 3-4 typical class assignments. Paid plans (Pro at $10/month for 1,000 submissions, Max at $20/month for 5,000) are for teachers grading regularly. No credit card required to start.
How does ClassLens compare to Google's built-in AI feedback in Classroom?
Google's native AI feedback drafts written comments for one student at a time. ClassLens grades against your rubric, scores submissions, writes feedback, and aggregates results into a class-wide Knowledge Gap Report. Many teachers use both. See the comparison table above for a full side-by-side.
Does ClassLens replace teacher review?
No. Every grade ClassLens produces routes to the Batch Review Dashboard before any student sees it. You review, edit, or override, then click "Return Checked" to release. Auto-release without teacher review was permanently removed from the product on April 12, 2026. There is no setting that bypasses your review.
Are student submissions stored?
No. Student submissions are processed transiently: read, graded, and discarded after grading completes. Grades and feedback are written back to your Google Classroom, not kept on ClassLens servers. The only student-linked data ClassLens retains is an opaque submission identifier used for billing and resubmission detection; never a student name, email, submission, grade, or piece of feedback. The architecture is FERPA-aligned by design.
Which assignment types does ClassLens grade well?
Open-ended rubric-graded work: essays, short-answer responses, paragraph responses, lab reports, reflections, source analyses, written problem solutions, and project write-ups. ClassLens also reads multimodal submissions natively: handwritten work (photographed or scanned), hand-drawn graphs, sketches, and free-body diagrams, CAD drawings, and lab writeups that mix text, tables, and figures. It grades best against a clear rubric; it is less suited to raw source-code files (have students submit a screenshot of the code and console output instead), password-protected files, and highly subjective creative work with no defined rubric. Multiple-choice and exact-match questions don't need ClassLens; Google Classroom handles them natively.
Can I customize the rubric?
Yes. Paste your existing rubric, upload it, or build one inside ClassLens. Any number of criteria, any weighting. ClassLens grades against the rubric you wrote; it does not invent criteria or change them mid-batch.
What AI model does ClassLens use?
Standard plan uses gemini-2.5-flash-lite via Google Cloud Vertex AI. Advanced plan uses gemini-3.1-flash-lite. Both are governed by the Google Cloud Data Processing Addendum. You choose the model per assignment based on stakes and complexity.
How accurate is ClassLens grading?
We publish our accuracy data instead of asking you to take our word for it. On a public benchmark of expert-scored essays, ClassLens's standard grading agrees with expert human graders about as consistently as two trained human graders agree with each other: a quadratic-weighted kappa of 0.623, against 0.612 for human-to-human agreement on the same essays. In internal testing on graded essays, we found no significant demographic bias across the student groups evaluated. ClassLens is built to deliver a teacher-reviewable draft, not a final grade: every grade routes to the Batch Review Dashboard for you to confirm or adjust before any student sees it. The full study is here: our accuracy and bias results.
What compliance documentation can districts review?
ClassLens is Google OAuth verified (April 2026), SOC 2 Type I attested (Percilchofe CPA LLC, April 2026), CASA Tier 2 reviewed (TAC Security, April 2026), a CISA Secure by Design Pledge signatory (April 2026), and COPPA-aligned. The full district packet (security overview, NDPA exhibits, attestation reports) is available for school districts.
Does ClassLens work outside Google Classroom?
Google Classroom is the primary integration today. Canvas LMS support is in development. If your district uses a different LMS, contact us; we want to know which platforms matter most.
What does ClassLens cost for a school district?
District pricing is invoiced annually based on student enrollment, tiered: small districts (under 5,000 students) at $10 per student, medium (5,000-15,000) at $8, large (15,000+) at $6. The full pricing details and district admin features are at for school districts.
Can ClassLens generate Knowledge Gap Reports for any rubric-graded assignment?
Yes. The report is rubric-driven: any assignment graded against a rubric in ClassLens produces a Knowledge Gap Report automatically. No extra setup, no extra cost. The report is part of every batch.
Ready to Grade Smarter?
Stop spending your evenings and weekends buried in papers. ClassLens gives you AI-powered grading that connects directly to Google Classroom, respects your standards, and gives you back the time grading takes away.
Free month included. No credit card required. Set up in under five minutes.
ClassLens is also available for school districts with volume pricing and admin controls.