Comparison

LSI 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

LSI Calculator

This app provides tools and educational resources to help users manage water systems, focusing on eco-friendly treatments for pools and spas. It aims to make water maintenance accessible to everyone, regardless of their experience level.

Highlights
  • Water science education
  • Pool and spa water management
  • Eco-friendly treatment guidance
  • NSF/ANSI Certified product information
  • Tools for water system management
Features
Read full description

Next Generation Water Science makes water (and the people who maintain it) look great. Next Generation Water Science makes eco-friendly water treatments for pools, spas, industrial and agricultural water systems. All products are NSF/ANSI Certified for purity and safety. Through education and helpful tools like this mobile app, Next Generation Water Science has helped people of all aptitudes manage water better.

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

LSI Calculator3 screens
Thread Calculator4 screens

Verdict

The call

LSI Calculator and Thread Calculator both sit at 4.4 stars, but that hides the real split: 100% of LSI Calculator's written reviews are positive against 33% of Thread Calculator's. LSI Calculator also leads on ads (none vs shown) and update cadence (every 2 months vs every 18 months). On price, rating, ratings volume and in-app purchases 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

On the App Store both sit at effectively the same score — 4.4 for LSI Calculator against 4.3 for Thread Calculator. Both are backed by a comparable volume of ratings — 5 and 13 respectively. Written reviews are what separate them: 100% of LSI Calculator's written reviews are positive against 33% of Thread Calculator's.

UpkeepUpdate frequency

LSI Calculator ships an update every 2 months, Thread Calculator every 18 months. The most recent releases landed on June 11, 2026 and September 9, 2026 respectively.

Scorecard5 real differences · 5 level
LSI Calculator versus Thread Calculator: the parameters behind the verdict, then further details
ParameterLSI CalculatorThread Calculator
PriceFreeFree
Rating4.4 (5 ratings) — better4.3 (13 ratings)
Positive reviews100.0% of reviews — better33.3% of reviews
Number of ratings513 — better
Update frequencyEvery 2 months — betterEvery 18 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size52 MB25 MB
Age rating12+4+
DeveloperPure Planet Science & Technology, Inc.GSR Gustav Stursberg GmbH

Customer experience

LSI Calculator

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Thread Calculator

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

In-app purchases

None

LSI Calculator

No in-app purchases

None

Thread Calculator

No in-app purchases

Questions

Is LSI Calculator free?
LSI 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.
Which has better reviews, LSI Calculator or Thread Calculator?
LSI Calculator is rated higher. LSI Calculator averages 4.4 out of 5 from 5 ratings, while Thread Calculator averages 4.3 from 13 ratings.
Do LSI Calculator or Thread Calculator have ads?
Thread Calculator shows ads; LSI Calculator does not.
Which is updated more often, LSI Calculator or Thread Calculator?
LSI Calculator ships an update every 2 months, and Thread Calculator every 18 months. Most recently, LSI Calculator was updated on June 11, 2026 and Thread Calculator on September 9, 2026.

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