Meet Reckon — Snap any math. Get the answer. Offline

Education

Reckon

Snap any math. Get the answer. Offline.

What Reckon does

Free. All features included. No subscription, no in-app purchases, no paid tiers — everything works the moment you install it.

Point the camera at a math problem (typed or handwritten). Tap the shutter. Reckon reads the equation with Apple's on-device Vision OCR, evaluates it with a pure-Swift expression engine, and shows the answer in big calm type.

It works on a plane. It works in a basement. It works at the school whose Wi-Fi has been broken since October. There is no internet call. There is no account. There is no subscription.

— Live camera with a satisfying shutter and an instant 1-second answer. — Shows the parsed equation above the answer so you can verify the OCR read your handwriting correctly. Tap to correct. — 'Show steps' toggle — see the substep-by-substep evaluation (e.g. 2 + 3 × 4 → 2 + 12 → 14). Honest math, no fake AI 'explanation.' — History tab logs every solve locally with image preview, parsed equation, answer, and timestamp. Tap any past solve to re-run or copy. — Manual entry tab — type an equation when you don't want to lift the camera. — Settings: decimal precision, haptic feedback on result, dark/light theme.

Reckon handles arithmetic: addition, subtraction, multiplication, division, percentages, parentheses, exponents, decimals, simple fractions. Algebra and calculus are intentionally out of scope — this app does one thing well.

A look inside

Tap any shot to see the full-resolution version.

What's in it

• Live camera with on-device OCR — Tap the shutter. Reckon captures the frame, runs VNRecognizeTextRequest, and extracts the math text. ~0.5–1.5 seconds depending on device. No frames are uploaded anywhere.
• Pure-Swift expression evaluator — Recursive-descent parser handles + − × ÷ % parentheses exponents decimals fractions with correct operator precedence and associativity. Pure Swift, zero dependencies, ~250 LoC.
• Edit-before-solve — After OCR, the parsed equation appears prominently above the answer. If Vision misread your handwriting, tap to edit. Solves recompute instantly.
• Show steps — Toggle in the result card. Reveals the substep-by-substep evaluation (e.g., 2 + 3 × 4 → 2 + 12 → 14). Honest arithmetic — not fake AI 'tutor.'
• History — Every solve is logged via SwiftData: the captured image thumbnail, the parsed equation, the answer, and the timestamp. Tap any row to re-open and re-edit.
• Manual entry — Second tab. Type an equation. Same evaluator. Useful when you don't want to lift the camera (or you're inside without a printout).

Why we built it

The newer alternatives (ScanSolve, MathGPT, AI Math Solver) are cloud-based and require internet — they don't work on a plane, in a basement, or in a school with broken Wi-Fi. There is no cal…

Who it's for

Students, parents helping with homework, and adults who just want a fast answer without an upsell to AI tutoring.

In one line: Snap any math. Get the answer. Offline.

Try it

Head to the Reckon app page for the full feature list, info table, and support links.

Found a bug, have a feature request, or want to share how you use Reckon? Comments are open below — anonymous is fine.