The Analysis Platform for Engineering Drawings

Compliance & registrations

See GD&T Issues Instantly.

GD&T errors should never delay your projects. F4 catches them before you release your designs.

Let nothing slip through your review process.

Drag and drop PDF and STEP files directly into F4 — processed locally, never uploaded.

Drop engineering files here

injector_lower.step4.2 MB · 3D Model

injector_lower.pdf1.8 MB · 2D Drawing

Check your full design against the ASME Y14.5 Standard, using F4’s Drawing Validation Engine.

We detect hundreds of kinds of common GD&T errors — without using AI.

F4 gives designers more confidence in their drawings and saves many painstaking hours of review and redlining.

F4 performs a wide range of engineering analyses to help you understand your design beyond simple syntax.

redlined_drawing.pdfPDF · 2D Drawing

Generate a redlined drawing that clearly summarizes your validation results and analysis for review and communication.

F4 plugs back into your design and manufacturing workflows. Generate redlined drawings, along with exports for every downstream workflow.

project_file.f4.F4 · Native

Share project files with teammates to communicate design intent.

inspection_report.xlsXLS · FAIR Table

Save your detected PMI data in a template FAIR table (AS9102).

Coming Soon

mbd_model.qifQIF · 3D

mbd_model.stepSTEP242 · 3D

Migrate to MBD - straight from your drawings.

Compare F4 Review, F4 Pro, and F4 Enterprise capabilities.
Features	F4 ReviewFor organizations that need expert drawing reviews, without the overhead.Buy Now	F4 ProFor single users looking to maximize their productivity.Contact Sales	F4 EnterpriseFor teams that want to perfect their drawing review process.Contact Sales
GD&T Validation	✓	✓	✓
Drawing Analysis	✓	✓	✓
Report & Template Exports	✓	✓	✓
Custom Rulechecks	−	Coming Soon	Coming Soon
Interface Stackups	−	✓	✓
Support for export-controlled data	Coming Soon	✓	✓
Custom Onboarding	−	−	✓
Dedicated Technical Support & Training	−	−	✓
Onsite Services	−	−	✓