This engineering tool simplifies flange hole layout for professionals. It offers three calculators for accurate marking of equispaced, angled, or equivalent holes, saving time and reducing errors in fabrication and machining. Works offline.





58+ iOS apps & games curated and reviewed
Out of 58+ flange hole marker apps and games on iOS, 17 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | Free | 5.0★ (1) | No | Yes | Aug 2026 | |
| 2 | $1.99 | — | No | No | Aug 2026 | |
| 3 | $3.99 | 5.0★ (1) | No | No | Jul 2026 | |
| 4 | $2.99 | — | No | No | Aug 2026 | |
| 5 | Free | 4.6★ (294K) | Yes | Yes | Sep 2026 | |
| 6 | Free | 4.6★ (86K) | Yes | Yes | Sep 2026 | |
| 7 | Free | 5.0★ (13) | No | No | Jul 2026 | |
| 8 | Free | 2.5★ (2) | No | No | Aug 2026 |





This engineering tool simplifies flange hole layout for professionals. It offers three calculators for accurate marking of equispaced, angled, or equivalent holes, saving time and reducing errors in fabrication and machining. Works offline.





Calculate the cord length needed to mark holes on a flange's pitch circle diameter. Ideal for fabrication professionals, this tool simplifies bolt hole marking on various industrial equipment.





This engineering tool accurately calculates and marks bolt hole positions on flanges for machinists and fabricators. It offers features for equispaced, angle-based, and equivalent hole counts, saving time and reducing manual errors in workshop settings.


Calculate precise flange hole markings for equispaced holes, angles, and equivalent hole counts. Supports both millimeters and inches for various fabrication and engineering applications.


Compete in thrilling races against rivals, navigating challenging obstacle courses with speed and strategy. Master precise controls to dodge, jump, and outmaneuver opponents to reach the finish line first. Each race offers unique tracks and escalating difficulty.


Engage in intense helicopter combat to rescue a hostage from relentless waves of enemies. Utilize a variety of weapons and slow-motion abilities to eliminate threats and protect your objective. Upgrade your gear and face challenging boss battles in this action-packed shooter.


Access essential measurements and dimensional data for API 6A integral flanges. This tool provides quick access to critical specifications for engineering and industrial applications.


Easily save and share your current location or specific points of interest. Ideal for marking spots in fields, repair needs, or hard-to-find areas. Locations can be shared via email for import on other devices.


Access dimensional and weight data for over 70 common ASME piping components. Provides information in Metric, US Customary Units, and Inch/Fractions, with audited weights for valves, flanges, and other parts. Ensures accuracy and up-to-date information based on the latest ASME specifications.


This business app provides industrial flanges for various industries, offering calculations and industry news. It connects users through social networks and offers a wide range of flange types and sizes.


Instantly access flange, pipe, and bolt data offline. Quickly find bolt sizes, torque patterns, flange dimensions, and pipe specifications. Ideal for pipefitters and steamfitters needing rapid access to piping information.










This application provides a digital slide rule for finding critical dimensions of high-pressure wellhead equipment, including integral flange and ring groove measurements. It functions like a traditional paper slide rule, offering convenience and accessibility for users needing these specific engineering calculations.


Organize your favorite places with custom markers, descriptions, and photos. Create folders, search for locations, and even measure distances and areas. Collaborate with friends and sync your maps across devices.






This utility app provides instant contact with well control services for emergencies. It also includes helpful calculators and lookup tables for casing, flange, coiled tubing, and nitrogen volume.