Free for teachers
AI worksheet grader
Attach a student's worksheet, homework or quiz as a photo or a file. Sparky checks every answer in the chat, explains the mistake behind each wrong one and drafts a score and a note to the student, for you to check.
Used by 250,000+ teachers, and built to FERPA, COPPA and GDPR standards.
How the worksheet grader works
Share the student's work
Take a photo of the worksheet or attach it as a PDF, a Word file or a scan. Add your answer key if you have one, and the points each question is worth.
Read the draft
Sparky marks every answer in the chat and explains what went wrong in the ones that missed. If you want the grade in a document to print or share, ask for one.
Make the grade yours
Change anything you disagree with in plain words, like "give her partial credit on 5". Sparky replies with the updated score.
What Sparky checks
Every answer, marked
Each answer is checked against your key, or against Sparky's own worked solution when the answers can be worked out, like math problems.
The mistake behind a wrong answer
Sparky names the error, such as "added the absolute values but kept the wrong sign", so you know what to reteach.
Your points and partial credit
Tell Sparky what each question is worth and when work earns partial credit. The total follows your rules.
Short written answers
Explanations get a score and a reason. Give Sparky your criteria, or a sample full answer, and it grades by them.
Handwriting from a photo
Flint reads handwriting in photos and scans, so paper worksheets don't need retyping.
A note to the student
Ask for a few sentences to the student about what they got right and what to fix, ready to print or paste into your learning platform.
Ways teachers use it
Quizzes and tests
A score for each student out of the points you set, with the questions they missed.
Exit tickets
Attach a stack of exit tickets and sort the class by who has it, who almost has it and who needs help tomorrow.
What to reteach
Grade a class set and ask which mistakes came up most, so tomorrow's warm-up goes after them.
Data privacy
Safe to use with student work
What happens to the files you upload and what your students write in Flint.
Not used to train AI
Student data in Flint is never used to train AI models.
Not shared
Flint does not share student data, or any other user data, with third parties.
Kept separate
Each school's data is kept apart from every other school's, and the AI providers Flint runs on can't reach it.
Signed agreements, on request
Flint signs a data processing agreement with any school that needs one, written to US state law and EU GDPR.
What teachers say about Flint
"Flint allows me to see trends in student performance, identify areas where multiple students may need additional support, and set up small groups to focus on specific skills."
Bonnie-Jean Chudzinski
US History Teacher at Notre Dame Preparatory
"I used it for my classroom activities for MYP4, MYP5, and DP1. It's great and saves time for creating some formative (exit ticket) for checking students' understanding. I also used it for revising topics before they sit for the final summative."
Ranto Silitonga
Mathematics Teacher at Changchun American International School
"One student used Flint to make a unit test study guide. Another checked homework by comparing their steps to AI solutions, identifying and correcting mistakes on their own. This independence and self-awareness are key signs of deeper learning."
Chaz Cleare
Middle School Math Teacher at The Kinkaid School
Frequently asked questions
Is the AI grader free?
Yes. It's free for teachers, and there's no limit on how many worksheets you can grade.
Do I need an answer key?
It helps but isn't required. Attach your key and Sparky grades against it. Without one, Sparky works out the answers itself and proposes point values, so check both before you use the score.
Can it grade handwritten worksheets?
Yes. Take a photo of the page or attach a scan or a PDF, and Flint reads the handwriting. Check a few against the paper before you trust it with a class set.
Can it mark up the student's page?
No. Sparky doesn't draw on the student's work. It quotes each answer next to its feedback, so you or the student can find it on the page. Ask for the feedback in a doc to print it and hand it back.
Can I get the grade in a document?
Yes. Sparky grades in the chat unless you ask for a document. Ask for one and you can print it, copy it, or open it in Google Docs or Word.
Does it put grades in my gradebook?
No. Every score is a draft for you to check. Copy the scores you agree with into your gradebook yourself.
Can it grade essays?
Use the AI essay grader for essays. It scores each row of your rubric and quotes the sentences behind each score.
Explore more tools
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AI essay grader
Share a student's essay and your rubric. Sparky comments on the sentences that matter and drafts a score for each row of your rubric.
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