Comparison

EF Calculator 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

EF Calculator

Features
Read full description

This App calculates cutting data for Twist Drills, Taps, Cold Forming Taps, Thread Milling Cutters and Milling Cutters. For the collet holder EMUGE Speedsynchro® and for FRANKEN Circle Segment End Mills is a Return-on-Investment-Calculator installed. It enables a comparison of cost and time against conventional machining processes.

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.

Screenshots

EF Calculator4 screens
Thread Calculator4 screens

Verdict

The call

The clearest difference is ads: EF Calculator at none against Thread Calculator's shown. EF Calculator also leads on update cadence (every 8 months vs every 18 months) and iOS requirement (11.0 vs 15.0). 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.

UpkeepUpdate frequency

EF Calculator ships an update every 8 months, Thread Calculator every 18 months. The most recent releases landed on September 18, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 7 level
EF Calculator versus Thread Calculator: the parameters behind the verdict, then further details
ParameterEF CalculatorThread Calculator
PriceFreeFree
Rating—4.3 (13 ratings) — better
Positive reviews—33.3% of reviews
Number of ratings—13 — better
Update frequencyEvery 8 months — betterEvery 18 months
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size10 MB25 MB
Age rating4+4+
DeveloperEMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik fuer PraezisionswerkzeugeGSR Gustav Stursberg GmbH

In-app purchases

None

EF Calculator

No in-app purchases

None

Thread Calculator

No in-app purchases

Questions

Is EF Calculator free?
EF Calculator 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 EF Calculator or Thread Calculator have ads?
Thread Calculator shows ads; EF Calculator does not.
Which is updated more often, EF Calculator or Thread Calculator?
EF Calculator ships an update every 8 months, and Thread Calculator every 18 months. Most recently, EF Calculator was updated on September 18, 2026 and Thread Calculator on October 13, 2026.

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