GDTPro: GD&T ASME Calculator
Mechanical Design & QA Tools
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
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/
The developer, Huseyin Ataseven, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- User Content
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Huseyin Ataseven
- Size
- 9 MB
- Category
- Productivity
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Turkish
- Age Rating
4+
- 4+
- Contains
User-Generated Content
- In-App Purchases
Yes
- GDTPro: GD&T ASME Monthly $14.99
- GDTPro: GD&T ASME Yearly $99.99
- Copyright
- © 2026 GDTPro: GD&T ASME ISO Calc