Yes — Digital Red Pen reads handwritten precalculus work and awards partial credit for the method, not just the result. Trig identities, transformations, and multi-step manipulation are scored step by step under your rules. Precalculus is in scope; Algebra 2 is the validated core.
Keyless Grading for Math
Grade handwritten precalculus — credit for the manipulation, not just the result
Identities, transformations, and multi-step manipulation are mostly process. Digital Red Pen reads the steps and gives credit for the method.
Get started →Why step-level grading matters for precalculus
Precalculus problems are long — proving an identity, solving a trig equation, composing or transforming functions. The final line rarely tells the story; the credit lives in the manipulation.
Digital Red Pen reads the worked steps and awards partial credit from the method under the rules you set in The Desk: a correct approach with a slip in the algebra still earns the approach, scored the same way on every paper.
Precalculus is in scope; Algebra 2 is the validated core, and every grade goes through your review in The Desk before it's final.
How it works
Scan your stack
Place your student exams with a clean copy of the test at the front. Scan to one PDF — no sorting, no cover sheets, no answer key required.
Upload — it grades in parallel
The system spawns an isolated worker for each exam and grades every paper in parallel — each read independently, at the same time. A full class set finishes in roughly the time a single exam takes, not one-after-another. One bad scan fails alone — it never holds up the rest of the batch.
Review, approve, done
The Desk — the built-in review layer — presents every grade for your sign-off. Override anything. Issue the report. Nothing reaches students until you approve.
What you get back
Partial credit from the steps
The system reads each student's handwritten work — setup, process, intermediate steps — and awards credit for what was correct, not only the final answer.
Per-student reports
Each student's exam comes back with a graded breakdown. Walk into class the next morning knowing exactly who needs what.
Class analytics
Grade distribution, score trends, and problem-level breakdowns — the diagnostic picture for the whole class, without a spreadsheet.
Deadline-safe by design
The isolation architecture means a malformed scan fails alone. Graceful partial results: if a few exams need your eyes, the rest of the batch comes back complete.
"I checked it against my own Algebra 2 grading. It agreed with me about as well as two good teachers agree with each other. Honestly, on the Sunday nights I graded after 9 pm, it was more consistent than I was — I was handing different scores to kids for the same work depending on how tired I felt. The machine doesn't have bad days."— Zack Alexander, co-founder and secondary math teacher
You make the call.
The machine applies the standard. You judge. That is not a disclaimer — it is the design. The Desk is a built-in review layer between grading and the report. Every grade is presented to you before it leaves the system. Override anything; rulings propagate automatically to every matching case in the stack, so one correction covers the whole class.
The system also knows what it is not good at. Handwritten graphs are hard to parse reliably, so graph-heavy problems are flagged and routed to you rather than graded with false confidence. You get the full picture — the grades it is confident in and the ones it is handing back.
Grading
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Start grading tonight →Frequently asked questions
What happens if it gets a grade wrong?
The Desk — the built-in teacher-review layer — surfaces every grade before any report is issued. The system flags low-confidence work (for example, graph-heavy problems where handwritten graphs are hard to parse) and routes those directly to you. You override any grade; the correction propagates to every matching case in the stack. Nothing reaches students until you approve.
How accurate is it?
The grading agreement is described as: 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. He found it more consistent than himself on the nights he graded when tired — he was handing back different scores for the same work depending on how he felt. The machine applies one standard to paper 1 and paper 150.
What subjects does it work for?
Math only. Algebra 2 is the validated core; Geometry, Pre-calculus, Calculus, Statistics, and middle-school math are in scope. Science is not in scope.
How long does a full class set take?
Digital Red Pen grades every exam in parallel — each paper read independently, at the same time — so a full class set finishes in roughly the time a single exam takes, not one-after-another. We will publish typical timing once we have measured the reworked system.
Does it handle trig identities and function work?
It reads multi-step handwritten manipulation — identities, trig equations, transformations, compositions — and scores by the steps shown under your rules. Precalculus is in scope; Algebra 2 is the validated core.
What if a student uses a different valid method?
You set the rules in The Desk and you review before anything is final. When work is ambiguous or takes an unexpected valid path, it's flagged to you rather than auto-scored — you make the call, and your decision applies to every matching paper.