About this app

GD&T Pro is the most comprehensive geometric dimensioning and tolerancing toolkit on iOS. Built for engineers, students, and inspectors, it puts ASME Y14.5-2018 and ISO GPS in your pocket — completely offline. FREE FEATURES • Symbol Reference — All 14 geometric characteristics with descriptions, key principles, and common mistakes. • FCF Builder — Build, validate, and export feature control frames with live preview and real-time error detection. • Bonus Tolerance Calculator — MMC/LMC bonus with step-by-step formula breakdowns. • Unit Conversion — mm to inch, 1-6 decimal places. • Dual Standard — Switch ASME Y14.5-2018 and ISO GPS anytime. Symbols, rules, and guidance adapt automatically. • Save Projects — Organize FCFs, calculations, and stackups by project. PRO — UNLOCK THE FULL TOOLKIT 8 advanced calculators with step-by-step solutions: • Virtual Condition — Worst-case boundaries for MMC/LMC on internal and external features. • Resultant Condition — Opposite boundary from VC for complete analysis. • Positional Tolerance — Floating and fixed fastener patterns with configurable split ratios. • Tolerance Stackup — Worst-case (100%) and RSS statistical analysis side-by-side. • Profile Tolerance — Bilateral, unilateral, and UZ profile disposition analysis. • Composite Tolerance — PLTZF vs FRTZF comparison with refinement ratios. • Datum Shift — Additional tolerance from datum departure at MMB. • Zero-at-MMC — Zero tolerance at MMC where VC equals MMC. Plus: • 3D Datum Reference Frame Visualizer with interactive rotation • 2D Tolerance Zone Visualization for 8 zone types • Camera OCR Scanner — extract FCFs from engineering drawings • CAD Import — STEP AP242 files with PMI extraction • PDF Report Export — professional reports for design reviews • Unlimited Projects WHY GD&T PRO - 100% Offline — works anywhere, zero internet required - Zero Data Collection — your data stays on your device - Step-by-Step Solutions with standard references - Expert Guidance — real-time tips as you work - Student Mode — extra explanations for learning Built by engineers, for engineers. Aerospace, automotive, medical devices, manufacturing — this is the GD&T companion you have been waiting for. Download free today. Upgrade to Pro for the full toolkit. Terms of Use: https://fluxrtx18-source.github.io/gdtpro-legal/terms-of-use/ Privacy Policy: https://fluxrtx18-source.github.io/gdtpro-legal/privacy-policy/

Audience growth

Ratings growth

Steady

7-day gain +0

Ratings / day 0.0

30-day gain +0

US rating-count history

0 ratings

Baseline captured. Growth appears after the crawler observes a changed rating count.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

Price tracking