Grading a class set of handwritten math by hand costs you a weekend. Digital Red Pen reads the whole stack — partial credit from each student's steps — and hands it back graded tonight, with per-student reports and a class skills rollup you can't build by hand. You review every score at The Desk and make the final call.
For 7–12 math teachers
Get your weekend back.
Scan your stack, upload one PDF. The exams come back graded — partial credit read from the handwritten steps — while you do something other than grade. Per-student reports ready for Monday, and a picture of your whole class you've never had the time to build.
Take it for a drive →The red pen is what you're really up against
Not another grading app. The stack on the kitchen table at 9pm on a Sunday. That's the competitor — the hours this was built to give back to you. And then to keep giving back, every test, all semester.
"I'll admit something I'm not supposed to. On the Sunday nights I graded after 9pm, the machine was more consistent than I was. Same partial-credit problem, two kids, basically the same work — and I'd hand out a 65 when I was tired and an 88 when I was fresh. One standard, held from paper 3 to paper 147, is something I couldn't actually do by hand. The machine doesn't have bad days."— Zack Alexander, co-founder and secondary math teacher
Then it shows you something the red pen never could
Grading by hand leaves you with a stack of scores. This leaves you with your class. Every test rolls up into a skills picture — who's stuck where, which step the room is missing, the mistake that's quietly spreading — built automatically from the work it just read.
Class skills rollup — Unit 6 test
28 students · auto-generatedHabit bug spreading: 9 students are dropping the ± when they take a square root — the same slip, traceable to one lesson. You'd never spot that from a pile of scores.
A representative class rollup, shown to illustrate the view. It's a by-product of the grading you already needed — no spreadsheet, no tallying.
And it gets better the longer you ride the semester
A red pen gives you the same nothing every week. This compounds. Because grading stops costing your weekend, you actually run the Tuesday warm-up you'd normally skip — and every one feeds the picture. The misconception you used to catch at the unit test shows up in week 3, while you can still do something about it.
The weekend was the door. The semester-long view of your class is the room.
You make the call.
You define the standard; the machine applies it — the same way, to every paper. That isn't a disclaimer, it's the design. The Desk — the built-in review layer — puts every grade in front of you before it reaches a student. Override anything, and the ruling propagates to every matching paper in the stack, so one correction covers the class.
And it knows its limits: handwritten graphs are hard to read reliably, so graph-heavy problems are flagged and routed to you rather than scored with false confidence.
Grading
$19
per month · per class · cancel anytime
100% money-back guarantee on your first graded exam — your test drive, on us. No free tier; the guarantee is the risk-reversal instead.
Take it for a drive →Frequently asked questions
How does it actually help me grade faster?
You scan your stack to one PDF and upload it. The system reads every paper in parallel, awarding partial credit from each student's handwritten steps, so a full class set comes back graded in roughly the time a single exam takes. You spend your time reviewing at The Desk and ruling on scores — not grading every paper from scratch.
What do I get back besides scores?
Each exam comes back as a per-student graded breakdown, and the class rolls up into a skills picture automatically — top missed skills, grade distribution, and recurring mistakes — built from the work the system just read. It's a by-product of the grading, not a separate spreadsheet you have to make.
Is it accurate?
The grading agreement is described this way: it agrees with an experienced teacher about as well as two good teachers agree with each other. The founder checked it against his own Algebra 2 grading and found it more consistent than himself on the nights he graded tired — because it applies one standard to paper 1 and paper 150. You review every score at The Desk and make the final call.
What about handwritten graphs?
Handwritten graphs are hard to read reliably, and the system knows it. Graph-heavy problems are flagged and routed to you at The Desk rather than scored with false confidence. You grade those by hand; everything else comes to you already graded.
Do I need an answer key or a rubric?
No. The keyless workflow reads the handwritten steps and awards partial credit with no answer key and no per-question rubric. If you want grading aligned to your exact solution and a deeper per-skill breakdown, you can optionally author a key — but it isn't required to start.
Is there a free trial?
There's no free tier. Instead there's a 100% money-back guarantee on your first graded exam — the risk-reversal in place of a free trial, so you can run a real class set and judge it for yourself. Built for grades 7–12 math; Algebra 2 is the validated core. Math only.