# Drill Calc vs Transition Layouts Pro

The clearest difference is update cadence: Drill Calc at every 18 months against Transition Layouts Pro's every 43 months. Drill Calc also leads on price ($2.99 vs $3.99) and iOS requirement (12.0 vs 16.1). On ads, in-app purchases and device support there is nothing between them.

Drill Calc costs $2.99 and Transition Layouts Pro $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Drill Calc ships an update every 18 months, Transition Layouts Pro every 43 months. The most recent releases landed on August 12, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Drill Calc | Transition Layouts Pro |
| --- | --- | --- |
| Price | **$2.99** | $3.99 |
| 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 43 months |
| Monetization | Paid | — |
| Size | 5 MB | 1 MB |
| Requires iOS | **12.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## 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


### Transition Layouts Pro

[App page](https://appshunter.io/ios/app/transition-layouts-pro/id1489898609)

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

**In-app purchases:** none


## Frequently asked questions

### Is Drill Calc free?

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

### Is Transition Layouts Pro free?

Transition Layouts Pro costs $3.99, with no in-app purchases.

### Do Drill Calc or Transition Layouts Pro have ads?

Neither Drill Calc nor Transition Layouts Pro shows ads.

### Which is updated more often, Drill Calc or Transition Layouts Pro?

Drill Calc ships an update every 18 months, and Transition Layouts Pro every 43 months. Most recently, Drill Calc was updated on August 12, 2026 and Transition Layouts Pro on September 15, 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.*