Free for teachers
AI writing feedback
Share a student's writing and say what to focus on. Sparky drafts feedback that quotes the student's own sentences, names what works and picks the few changes that will help most, for you to check before the student sees it.
Used by 250,000+ teachers, and built to FERPA, COPPA and GDPR standards.
How AI writing feedback works
Share the student's writing
Paste it into the chat, or attach a Word file, a PDF or a photo of a handwritten page. You can also import it from Google Drive or OneDrive. If you send a request without the writing, Sparky asks for it first.
Say what the feedback is for
Sparky comments straight away, then asks for a rubric or a focus. Tell it the grade, whether this is a first draft or a final copy, and the skill to work on, and the next comments follow that.
Check it and pass it on
Sparky writes the feedback in the chat. To print or share it, ask for it in a document, which you can edit, copy, open as a Google Doc or download as a Word file.
What the feedback includes
The student's own sentences
Comments quote the lines they are about, so the student can find each one in the draft.
What is working
Strengths come first, named specifically, so the student knows what to keep doing.
A few next steps
Sparky picks the small number of changes that will help most instead of marking every error.
Your focus or rubric
Name a skill, such as dialogue or using evidence, or attach your rubric, and the comments stay on it.
Feedback that fits the draft
Say whether it is a first draft or a final copy, and Sparky aims the comments at that stage.
The writing stays the student's
Sparky explains what to revise and why, and doesn't rewrite the student's sentences.
Ways teachers use it
First drafts
Comments on ideas and organization while there is still time to revise, with two or three things to work on next.
Paragraph answers
Short constructed responses checked for a claim, evidence and reasoning, with a comment on each part.
Writing conferences
Read Sparky's feedback before you sit down with a student, and choose the one thing to talk about.
Science and history writing
Lab report conclusions, source analyses and research papers, with feedback on the criteria your subject uses.
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 did a great job at editing my students' pieces and helping them find specific areas of their writing they can work to improve. It freed me up to meet with students one on one and talk about their writing.”
Andi Bo
3rd grade English teacher at Harker
"After finishing our narrative writing unit, I uploaded my editing checklist into Flint. I have never seen my students so engaged in editing. I had initially put a 30 minute time-limit on the assignment, but my students begged me to extend it. Wow!"
Keri Clifford
English teacher at Harker
"One student recently told me, “Mrs. Kimsey, it’s like you turned yourself into a robot. Flint sounds just like you!” In my 15 years of teaching, I’ve never seen students revise so actively or reflect so deeply on their writing."
Allison Kimsey
MYP and DP English Teacher at Fukuoka International School
Frequently asked questions
Is AI writing feedback free?
Yes, it's free for teachers.
Can students use it to get feedback on their own writing?
No. AI Writing Feedback is a teacher tool, so a student account can't open it. Students can use the AI Writing Assistant in Flint, which gives feedback on their own drafts and asks them questions without writing the work for them. For college essays, students can use the college application helper.
What makes writing feedback helpful?
Feedback helps most when it points to a specific sentence, says what the student did well, and gives one or two changes they can make in the next draft. Sparky writes feedback in that shape, and you can ask it to keep to a single skill.
How accurate is AI feedback on student writing?
Read it as a first pass. Sparky can misread what a student meant or praise something you would push on, so check the feedback and change it before the student sees it. Our guide on using AI to grade covers what the research says.
Will Sparky rewrite the student's work?
No. Sparky says what to revise and why, and leaves the rewriting to the student, so the next draft is still their own work.
Can it read handwritten writing?
Yes. Attach a photo or a scan of the pages, and Flint reads the handwriting into text Sparky can comment on. Compare a few quoted sentences with the page to make sure the handwriting was read correctly.
How is this different from the essay grader?
The essay grader scores an essay against your rubric. AI writing feedback gives comments with no score, on any kind of writing, which suits drafts the student will revise.
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.
AI rubric generator
Make a rubric from your assignment or a one-line request, with criteria, levels and points you can edit, print or export.
Report card comment generator
Give Sparky a few words about each student, or your gradebook export, and get a report card comment for each one.
