117+ iOS apps curated and reviewed
The best flange hole marker pro apps on iPhone average 3.6★ across 117+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | $2.99 | — | No | No | Aug 2026 | |
| 2 |  | Free | 5.0★ (1) | No | Yes | Sep 2026 | |
| 3 |  | $1.99 | — | No | No | Aug 2026 | |
| 4 |  | $3.99 | 5.0★ (1) | No | No | Jul 2026 | |
| 5 |  | Free | 2.5★ (2) | No | No | Aug 2026 | |
| 6 |  | Free | 5.0★ (13) | No | No | Jul 2026 | |
| 7 |  | Free | — | No | No | Aug 2026 | |
| 8 |  | Free | — | No | No | May 2026 |
Calculate precise flange hole markings for equispaced holes, angles, and equivalent hole counts. Supports both millimeters and inches for various fabrication and engineering applications.
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.
