Drill Calc vs Thread Calculators
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Drill Calc
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.
- 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
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Need to find the right drill bit size for a hole? Drill Calc calculates the correct drill bit size to use for threaded holes, based on the bolt (tap) diameter and thread pitch and percentage, for both inch and metric threads. Close and tight fit hole sizes for many popular drill sizes are also displayed. It also has tables of standard inch fractional and numeric drill bit sizes, as well as complete information for various pipe sizes. There is also detailed information about the commonly used sizes of wood screws. Buy your copy of Drill Calc today, and put away your drill chart.
Thread Calculators
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.
- 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
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Get quick and accurate thread-cutting data with this complete thread calculator app. It supports a wide range of international thread standards, including M, MF, UNC, UNF, UNEF, UNR, UNS, NPT, NPTF, NPSC, NPSF, NPSL, NPSM, BA, BSP, BSF, BSW, BSPP, TR, and TRF. Whether you're a machinist, engineer, or CNC professional, this app helps you find the right measurements instantly. Access detailed tables for thread dimensions and cutting values in one place. Key tools included: - Tap Hole Size Calculator – Find the correct drill size for perfect threading - Bolt Diameter Guide – Quickly check standard bolt dimensions - Tap Hole Forming Data – Accurate values for forming taps - Tap Hole Repair Values – Fix damaged threads with the correct specs This app is your handy companion for fast, reliable, and precise thread-cutting calculations.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Drill Calc | Thread Calculators |
|---|---|---|
| Price | $2.99 | $1.99 — better |
| Rating | 4.1 (19 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 91.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 19 — better | 1 |
| Update frequency | Every 18 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 5 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Black Cat Systems | Kantaben Gorasiya |
Customer experience
Drill Calc
Thread Calculators
In-app purchases
Drill Calc
No in-app purchases
Thread Calculators
No in-app purchases
Questions
Is Drill Calc free?
Is Thread Calculators free?
Which has better reviews, Drill Calc or Thread Calculators?
Do Drill Calc or Thread Calculators have ads?
Which is updated more often, Drill Calc or Thread Calculators?
Other comparisons
