What it sells
The GD&T Analysis Platform for Engineering Drawings
Business model breakdown
Buyer: who owns the budget?
UnverifiedDesign engineering and quality leads who want compliant drawings released, inferred.
Trigger: what makes them buy now?
Avoiding non-compliant drawing releases and misread drawings by manufacturers and vendors that cause scrap, rework and wasted time.
Workflow: what inputs become what output?
Import PDF and STEP files locally, validate the full design against the standard, analyze datum reference frames and stackups, export reports and templates, and use it before changing part maturity in PLM.
Economics: what it saves and how it charges
Software licenses in three editions plus a review service; value claim is catching errors before release and saving manual redlining hours.
Distribution: how it reaches customers
F4 Review is buy-now (self-serve) ; Pro and Enterprise via Contact Sales; downloadable on-device app.
Funding history and coverage
| Round date | Stage | Amount | Investors | Source |
|---|---|---|---|---|
| — | Y Combinator Summer 2025 | — | Y Combinator | ycombinator.com |
Profiles summarize public reporting and company websites. Business-model notes are MaxBC's reading of that material, not confirmed facts; unknowns are left blank rather than guessed. Updated 2026-10-12.