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.





61+ iOS apps & games curated and reviewed
Out of 61+ 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 | Sep 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 | 5.0★ (13) | No | No | Jul 2026 | ||
| 6 | Free | 2.5★ (2) | No | No | Aug 2026 | ||
| 7 | Free | 4.6★ (295K) | Yes | Yes | Sep 2026 | ||
| 8 | Free | 4.6★ (86K) | Yes | Yes | Sep 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.