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/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
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