# Drill Calc vs Drive Diagnostics

The clearest difference is price: Drive Diagnostics at Free against Drill Calc's $2.99. Drive Diagnostics also leads on update cadence (every 6 months vs every 18 months). Drill Calc's advantage is iOS requirement (12.0 vs 14.0). On ads, in-app purchases and device support there is nothing between them.

Drive Diagnostics is free to download; Drill Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Drill Calc ships an update every 18 months, Drive Diagnostics every 6 months. The most recent releases landed on October 31, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Drill Calc | Drive Diagnostics |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.1 (19 ratings)](https://appshunter.io/ios/app/drill-calc/id304434324/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 91.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 6 months** |
| Monetization | Paid | — |
| Size | 5 MB | 9 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Bonfiglioli SPA](https://appshunter.io/developer/670210180) |

## What reviewers say

### Drill Calc

[App page](https://appshunter.io/ios/app/drill-calc/id304434324)

This utility app helps you determine the correct drill bit size for threaded holes. It supports both inch and metric threads, calculates close and tight fit hole sizes, and provides tables for standard drill bit sizes and pipe information.

**Highlights:** Calculates drill bit size for threaded holes, Supports inch and metric threads, Displays close and tight fit hole sizes, Includes standard inch fractional and numeric drill bit tables, Provides pipe size information, Offers data on common wood screw sizes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Drive Diagnostics

[App page](https://appshunter.io/ios/app/drive-diagnostics/id1523617166)

**In-app purchases:** none


## Frequently asked questions

### Is Drill Calc free?

Drill Calc costs $2.99, with no in-app purchases.

### Is Drive Diagnostics free?

Drive Diagnostics is free to download, with no in-app purchases.

### Do Drill Calc or Drive Diagnostics have ads?

Neither Drill Calc nor Drive Diagnostics shows ads.

### Which is updated more often, Drill Calc or Drive Diagnostics?

Drill Calc ships an update every 18 months, and Drive Diagnostics every 6 months. Most recently, Drill Calc was updated on October 31, 2026 and Drive Diagnostics on November 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*