Thread Calculator vs ThreadFon Multi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Thread Calculator
This app provides a quick and easy way to calculate thread dimensions for various units, including tap hole sizes and bolt specifications. It helps metalworkers find precise measurements for internal and external threads without consulting tables.
- Thread cutting calculator for multiple units
- Cold forming calculator
- Thread repair calculator
- Tap hole and bolt diameter calculation
- Saves time compared to tables
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The app includes: - A calculator for thread cutting for the following units: M, MF, UNC, UNEF, UNF, UNR, UNS, NPT, NPTF, NPSC, NPSF, NPSL, NPSM, BA, BSP, BSF, BSW, BSPP, TR, and TRF - A calculator for cold forming - A calculator for thread repair You want to know which tap hole you should drill for threading or which bolt you should use? With this app, you will find the desired measures in no time: Simply select the desired thread type, nominal size, and pitch and you will get the matching diameter for your project. This saves precious time you would have spent tediously searching for internal and external thread dimensions in tables. As this app is still in its development phase, new features will follow soon, so stay tuned! GSR Gustav Stursberg GmbH is a manufacturer for high-quality thread cutting tools with 130 years of operational experience in the area of threading tool production. The product portfolio includes a wide selection of tools for different areas of application. GSR taps, twist drills, round dies, and tool holders are manufactured to the highest quality standards in our own production facilities. The constant quality control during the production process guarantees a consistent good quality in all national as well as international production facilities. This requires enormous precision, which is reflected by our tools. Precision is in the details. Since 1889.
ThreadFon Multi
This tool provides detailed insights into metric, inch, pipe, and trapezoidal cylindrical threads based on ISO and ASME standards. It helps users efficiently determine essential thread specifications for various thread types.
- ISO Metric thread support
- Unified Inch thread support
- Pipe thread support
- Trapezoidal thread support
- Based on ISO 965 and ASME B1.1 standards
- Determines fundamental thread parameters
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This application now supports ISO Metric, Unified Inch, Pipe, and Trapezoidal Thread Tolerances, providing detailed insights into the fundamental parameters of metric, inch, pipe, and trapezoidal cylindrical threads. Built on the ISO 965 standard, ASME/ANSI B1.1 standard, ISO 228, ANSI/ASME B1.20.1, ГОСТ 6357-81, and GOST 24737-81 standard. Designed for precision and ease, this tool helps you efficiently determine essential thread specifications for metric, unified inch, pipe, and trapezoidal threads.
Screenshots
Verdict
The clearest difference is review sentiment: ThreadFon Multi at 80% against Thread Calculator's 33%. ThreadFon Multi also leads on ads (none vs shown) and update cadence (monthly vs every 18 months). Thread Calculator's advantage is rating (4.3 vs 3.8) and ratings volume (13 vs 4). On price, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Thread Calculator holds the better App Store score, 4.3 against 3.8. Both are backed by a comparable volume of ratings — 13 and 4 respectively. Written reviews complicate that: 33% of Thread Calculator's written reviews are positive against 80% of ThreadFon Multi's, so the app with the better star average is not the one people write more warmly about.
Thread Calculator ships an update every 18 months, ThreadFon Multi monthly. Both last shipped on September 9, 2026.
| Parameter | Thread Calculator | ThreadFon Multi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (13 ratings) — better | 3.8 (4 ratings) |
| Positive reviews | 33.3% of reviews | 80.0% of reviews — better |
| Number of ratings | 13 — better | 4 |
| Update frequency | Every 18 months | Monthly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | GSR Gustav Stursberg GmbH | Dmitriy Trofimov |
Customer experience
Thread Calculator
ThreadFon Multi
In-app purchases
Thread Calculator
No in-app purchases
ThreadFon Multi
No in-app purchases
Questions
Is Thread Calculator free?
Is ThreadFon Multi free?
Which has better reviews, Thread Calculator or ThreadFon Multi?
Do Thread Calculator or ThreadFon Multi have ads?
Which is updated more often, Thread Calculator or ThreadFon Multi?
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