# GDTPro: GD&T ASME Calculator > Mechanical Design & QA Tools Canonical page: [https://chrome-stats.com/d/id6758917712](https://chrome-stats.com/d/id6758917712) ## Overview - **ID:** `id6758917712` - **Platform:** Apple - **Type:** Apple app - **Status:** Available - **Publisher:** Huseyin Ataseven - **Category:** Productivity - **Version:** 1.0 - **Last updated:** 2026-04-03 - **First published:** 2026-04-03 - **Size:** 8.59 MB - **Data as of:** 2026-09-20 - **Store listing:** [Apple App Store](https://apps.apple.com/us/app/gdtpro-gd-t-asme-calculator/id6758917712) - **Website:** [https://fluxrtx18-source.github.io/gdtpro-legal/](https://fluxrtx18-source.github.io/gdtpro-legal/) - **Privacy policy:** [https://fluxrtx18-source.github.io/gdtpro-legal/privacy-policy/](https://fluxrtx18-source.github.io/gdtpro-legal/privacy-policy/) ## Description The most comprehensive GD&T toolkit on iOS. Build FCFs, calculate tolerances, visualize zones - all offline. ASME Y14.5-2018 and ISO GPS. 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/ ## Rankings - #1,006,947 — Overall ## Similar extensions and apps - [GD&T Check](https://chrome-stats.com/d/id6801021289) — 5.00 / 5 - [GD&T pro](https://chrome-stats.com/d/id976631549) — 2.70 / 5 - [GD & T Guide](https://chrome-stats.com/d/id1374135977) — 3.00 / 5 - [GD&T HD](https://chrome-stats.com/d/id627968870) — 2.00 / 5 - [GD&T](https://chrome-stats.com/d/id627973440) - [ISO Fits & Tolerance Tools](https://chrome-stats.com/d/id6761895214) - [engineering-calculator](https://chrome-stats.com/d/id6790046592) - [Tolerance Fit Calculator](https://chrome-stats.com/d/id6773591777) — 2.00 / 5 - [Construction Master Pro Calc](https://chrome-stats.com/d/id370406446) — 4.80 / 5 - [CNC Machinist Calculator](https://chrome-stats.com/d/id6605942020) — 5.00 / 5 - [The Engineers Field Toolkit](https://chrome-stats.com/d/id6759167608) - [Machining Assistant](https://chrome-stats.com/d/id6766735667) — 2.00 / 5 --- Source: [Chrome-Stats](https://chrome-stats.com/d/id6758917712)