Comparison

Thread Calculator vs ThreadFon Multi

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Thread cutting calculator for multiple units
  • Cold forming calculator
  • Thread repair calculator
  • Tap hole and bolt diameter calculation
  • Saves time compared to tables
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

Thread Calculator4 screens
ThreadFon Multi4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Thread Calculator ships an update every 18 months, ThreadFon Multi monthly. Both last shipped on September 9, 2026.

Scorecard7 real differences · 3 level
Thread Calculator versus ThreadFon Multi: the parameters behind the verdict, then further details
ParameterThread CalculatorThreadFon Multi
PriceFreeFree
Rating4.3 (13 ratings) — better3.8 (4 ratings)
Positive reviews33.3% of reviews80.0% of reviews — better
Number of ratings13 — better4
Update frequencyEvery 18 monthsMonthly — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size25 MB43 MB
Age rating4+4+
DeveloperGSR Gustav Stursberg GmbHDmitriy Trofimov

Customer experience

Thread Calculator

All ratings13 ratings
Positive84.6%
Neutral7.7%
Negative7.7%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

ThreadFon Multi

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews10 reviews
Positive80.0%
Neutral10.0%
Negative10.0%

In-app purchases

None

Thread Calculator

No in-app purchases

None

ThreadFon Multi

No in-app purchases

Questions

Is Thread Calculator free?
Thread Calculator is free to download, with no in-app purchases.
Is ThreadFon Multi free?
ThreadFon Multi is free to download, with no in-app purchases.
Which has better reviews, Thread Calculator or ThreadFon Multi?
Thread Calculator is rated higher. Thread Calculator averages 4.3 out of 5 from 13 ratings, while ThreadFon Multi averages 3.8 from 4 ratings.
Do Thread Calculator or ThreadFon Multi have ads?
Thread Calculator shows ads; ThreadFon Multi does not.
Which is updated more often, Thread Calculator or ThreadFon Multi?
Thread Calculator ships an update every 18 months, and ThreadFon Multi monthly. Most recently, Thread Calculator was updated on September 9, 2026 and ThreadFon Multi on September 9, 2026.

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