Drawing Review

Six Categories, One Pass

1. DFM Issues — Wall thickness, draft angles, undercuts, tool access, and process-specific concerns. Upload a STEP file for geometry-calibrated DFM analysis with 3D preview.
2. GD&T Compliance — Feature control frames checked against ASME Y14.5. Incorrect symbols, missing datums, and conflicting callouts caught automatically.
3. Tolerance Analysis — Over-constrained dimensions, unrealistic tolerances for the specified process, and tolerance stack-up risks identified up front.
4. Drawing Standards — Title block completeness, projection method, scale consistency, view arrangement, and general ASME/ISO drawing conventions.
5. Missing Information — Surface finishes, material callouts, heat treatment specs, revision notes, and other critical info that's easy to forget.
6. Cross-Reference Analysis — Upload a drawing package and get holistic checks — datum consistency between mating parts, tolerance stackups, BOM matching, and assembly-to-part callout alignment.

Interactive Follow-Up

• Reference Panel — Expand the inline reference panel to view your 3D model and drawing pages right next to the findings. Orbit the model, zoom into drawing details, flip between pages.
• Follow-Up Chat — Ask Claude about any finding, request clarification, or add context. The chat has full memory of the review, geometry stats, and your drawing.
• Paste Screenshots — Take a snip of a specific feature, paste it straight into the chat (Ctrl+V), and ask Claude about it. Point at exactly what you're talking about.

How It Works

1. Upload a drawing, a STEP file, or both — Drag and drop a PDF, image, or STEP/STP file. Upload a drawing for visual review, a STEP file for 3D geometry DFM analysis, or both for a combined design review where Claude gets 3D context alongside the drawing.
2. Claude analyzes against engineering standards — Your files are analyzed by Claude Sonnet (Anthropic). Drawings get vision-based review of DFM, GD&T, tolerances, and standards. STEP files are parsed in-browser using OpenCascade WASM, extracting geometry stats that Claude uses for calibrated DFM screening. Combined mode gives Claude both sources for ground-truth cross-referencing.
3. Review findings, reference, and follow up — Findings are grouped by category and severity. Expand the reference panel to see your 3D model and drawing pages alongside the results. Accept or dismiss findings, then ask follow-up questions in the built-in chat — paste screenshots to point at specific features. Export a PDF report when you're done.

This tool is a first-pass filter — it catches the 80% of issues that slow down manufacturing. It does not replace a qualified engineer's review, but it makes that review faster and more consistent.

Your Files Stay Private

• Processed in Your Browser — STEP files are parsed entirely client-side using OpenCascade WASM. PDF pages are rendered locally with pdf.js. Your files never touch our servers.
• Nothing Stored — Drawing images are sent to Anthropic's Claude API for analysis, then discarded. No files are saved, cached, or logged. Review history lives only in your browser's local storage.
• No Accounts, No Tracking — No sign-up required. No analytics. No cookies beyond what's needed to run the tool. If you use your own API key, it stays in your browser — never sent to us.

Every Team That's Sent a Drawing to the Shop and Gotten a Call Back

• Design engineers who want to catch drawing errors before a formal review — or before the machinist does.
• Quality teams looking for a consistent, repeatable first-pass screen on incoming drawings.
• Job shops and contract manufacturers receiving drawings from customers that need validation before quoting.
• Startups moving to production without a dedicated quality engineering team to catch what the CAD model doesn't tell you.