Comparison

GD&T vs Thread Calculator

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

Head to head
About

GD&T

Read full description

Learn, interpret and inspect GD&T according to ISO 1101. This app describes a large range of definitions of geometric dimensioning and tolerancing and supports engineers and employees as a multimedia reference book. As part of operative education, this app shows relationships and makes it easier to understand the right handling of form and position tolerances in practice. This app explains the most important definitions of GD&T and its interpretation by examples (straightness, roundness, flatness, cylindricity, profile of a line, parallelism, squareness, angularity, position, concentricity, symmetry, circular runout, …) -25 animations -Basic information -Form tolerance -Profile tolerance -Position tolerance -Orientation tolerance -Runout tolerance

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
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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.

Screenshots

GD&T4 screens
Thread Calculator4 screens

Verdict

The call

The clearest difference is ads: GD&T at none against Thread Calculator's shown. On price, update cadence, 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.

UpkeepUpdate frequency

GD&T ships an update every 11 months, Thread Calculator every 18 months. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

Scorecard1 real difference · 9 level
GD&T versus Thread Calculator: the parameters behind the verdict, then further details
ParameterGD&TThread Calculator
PriceFreeFree
Rating—4.3 (13 ratings) — better
Positive reviews—33.3% of reviews
Number of ratings—13 — better
Update frequencyEvery 11 months — betterEvery 18 months
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size56 MB25 MB
Age rating4+4+
DeveloperCarl Zeiss AGGSR Gustav Stursberg GmbH

In-app purchases

None

GD&T

No in-app purchases

None

Thread Calculator

No in-app purchases

Questions

Is GD&T free?
GD&T is free to download, with no in-app purchases.
Is Thread Calculator free?
Thread Calculator is free to download, with no in-app purchases.
Do GD&T or Thread Calculator have ads?
Thread Calculator shows ads; GD&T does not.
Which is updated more often, GD&T or Thread Calculator?
GD&T ships an update every 11 months, and Thread Calculator every 18 months. Most recently, GD&T was updated on October 14, 2026 and Thread Calculator on October 13, 2026.

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