# Drill Calc vs Thread Calculators

The clearest difference is rating: Thread Calculators at 5.0 against Drill Calc's 4.1. Thread Calculators also leads on review sentiment (100% vs 92%) and price ($1.99 vs $2.99). Drill Calc's advantage is ratings volume (19 vs 1). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Drill Calc costs $2.99 and Thread Calculators $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Thread Calculators holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Drill Calc has 19 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 92% of Drill Calc's written reviews are positive against 100% of Thread Calculators's.

Drill Calc ships an update every 18 months, Thread Calculators every 10 months. The most recent releases landed on August 12, 2026 and August 1, 2026 respectively.

## The numbers

| Metric | Drill Calc | Thread Calculators |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | [4.1 (19 ratings)](https://appshunter.io/ios/app/drill-calc/id304434324/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thread-calculators/id1670586227/reviews)** |
| Number of ratings | **19** | 1 |
| Positive reviews | 91.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 10 months** |
| Monetization | Paid | Paid |
| Size | 5 MB | 51 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## 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


### Thread Calculators

[App page](https://appshunter.io/ios/app/thread-calculators/id1670586227)

This app provides precise thread-cutting data for various international standards. It assists machinists, engineers, and CNC professionals in quickly finding essential measurements and detailed tables for thread dimensions and cutting values.

**Highlights:** Supports international thread standards (M, UNC, NPT, etc.), Tap Hole Size Calculator, Bolt Diameter Guide, Tap Hole Forming Data, Tap Hole Repair Values, Detailed thread dimension tables

**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 Thread Calculators free?

Thread Calculators costs $1.99, with no in-app purchases.

### Which has better reviews, Drill Calc or Thread Calculators?

Thread Calculators is rated higher. Drill Calc averages 4.1 out of 5 from 19 ratings, while Thread Calculators averages 5.0 from 1 ratings.

### Do Drill Calc or Thread Calculators have ads?

Neither Drill Calc nor Thread Calculators shows ads.

### Which is updated more often, Drill Calc or Thread Calculators?

Drill Calc ships an update every 18 months, and Thread Calculators every 10 months. Most recently, Drill Calc was updated on August 12, 2026 and Thread Calculators on August 1, 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.*