248+ iOS apps curated and reviewed
Looking for free tap drill chart apps? 11 of our 248+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (13) | No | No | Nov 2026 | |
| 2 |  | Free | — | No | Yes | Oct 2026 | |
| 3 |  | $1.99 | 4.3★ (30) | No | No | Oct 2026 | |
| 4 |  | $0.99 | 4.5★ (22) | No | No | Oct 2026 | |
| 5 |  | Free | — | No | Yes | Oct 2026 | |
| 6 |  | $0.99 | — | No | No | Oct 2026 | |
| 7 |  | $2.99 | — | No | No | Aug 2026 | |
| 8 |  | Free | 4.6★ (47) | No | No | Nov 2026 |
This app serves as a comprehensive reference and calculator for various thread types and dimensions. It provides detailed information on Metric and UN threads, including tap sizes and thread calculations for cutting and forming taps. Users can also find drill size charts and calculate RPM and feed rates for different materials.
Calculate the correct drill bit size for your tapping operations. Supports various thread types and inch/metric measurements. Provides precise calculations for depth of thread and clearance.
