Engineering teams often struggle to verify that GD&T annotations on drawings are clear, manufacturable, and compliant with standards, leading to costly rework, miscommunication, and delays, especially in regulated aerospace and defense environments.

F4 provides a locally installed software platform that parses 2D and 3D design files from major CAD systems and performs rule‑based GD&T analysis without using AI. The tool automatically interprets ASME Y14.5‑2018 symbols, flags non‑compliant or ambiguous features, and guides engineers to resolve issues. It visualizes datums, reference frames, and tolerance zones directly on the 3D model, and computes full tolerance stack‑ups, generating Excel tables and FAIR/AS9102C reports. All data remain on‑device, supporting ITAR/EAR‑controlled designs and enabling secure, offline workflows for design, manufacturing, and inspection teams.

Rule‑based GD&T analysis that checks every geometric control for clarity, manufacturability, and production readiness

Automatic interpretation and ballooning of GD&T symbols with standard‑compliant definitions

Real‑time tolerance stack‑up calculation that produces min/max distance tables exportable to Excel

3D visualization of datums, reference frames, and tolerance zones overlaid on STEP models

Export of pre‑filled FAIR/AS9102C reports and PDF markup packages for QA and manufacturing

On‑device operation with support for ITAR and EAR compliance, including two‑factor authentication

Integration with major CAD formats (NX, CATIA, SolidWorks, CREO, Fusion 360, Onshape) without creating new design files

F4 is aimed at engineering, manufacturing, and quality teams in aerospace, defense, and other regulated industries that need reliable GD&T verification and tolerance analysis for complex mechanical drawings.

F4 offers a free “Lite” tier with basic viewing and ballooning features, and a paid Enterprise subscription billed annually that includes unlimited seats, comprehensive GD&T and tolerance analysis, export capabilities, expert support, and regulated‑environment security features.