AI-powered
writing evaluation
for educators and TAs
Assess writing with speed, precision, and insight. Purple Crayon turns messy writing into structured, rubric-based feedback in seconds.
Purple Crayon, built for iPhone and iPad
Most instructors and TAs use Purple Crayon on the go. Snap a picture of student work, run an evaluation, and share feedback – all from your Apple device.
- ✓ Optimized for iOS – fast, responsive, and designed for mobile first.
- ✓ Capture handwritten work with your camera and evaluate in seconds.
- ✓ Stay in sync with the web app – rubrics, schemas, and results are shared.
Currently available on Apple devices. Android support is planned for the future.
Built for academic writing review
Designed for essays, reflections, reports, and more, with feedback that matches how you already grade. Purple Crayon supports instructors, TAs, and admins across courses and cohorts.
Instant AI feedback
Get immediate grammar, tone, and clarity suggestions powered by large language models tuned for academic writing, so students see what to fix right away.
Supports essays, reflections, lab reports & more
Rubric-based scoring
Automatically evaluate writing against your own grading rubrics. Get per-criterion scores, rationales, and language you can paste directly into your LMS or feedback tools.
Reuse rubrics across courses & sections
Built for collaboration
Invite co-instructors or TAs, share evaluation schemas, and keep everyone aligned on how writing is assessed across your program.
Perfect for multi-section courses & TA teamsJust 3 simple steps
From first draft to final feedback in minutes, not days. Purple Crayon fits into your existing grading workflow.
Upload writing
Instructors, teachers, or admins can snap a picture or upload essays, reports, or reflections directly into our editor.
Choose rubric
Select from preset rubrics or define your own evaluation schema to match the way you already grade in class.
Get feedback
Purple Crayon analyzes the text and produces structured feedback and scores, ready to share with students or export to your LMS.
What educators are saying
Purple Crayon is built to help instructors spend less time on mechanics and more time on teaching.
Alexandra P.
High school English teacher
"Purple Crayon cuts my grading time in half while still letting me control the rubric. My students get clearer feedback and I get my evenings back."
David M.
University writing instructor
"The rubric-based scoring is exactly what we needed. Our TA team can stay aligned across multiple sections and assignments."
Monica R.
Program coordinator
"We use Purple Crayon to pilot new writing assignments across our program. The structured feedback makes it much easier to compare cohorts."
Try Purple Crayon now. The future of writing evaluation is here.
Spin up your first evaluation schema, invite a TA, and see how quickly you can move through a stack of writing.