Comparison

Bolt Length 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

Bolt Length

This application helps calculate the length of metric coarse screws based on Japanese Industrial Standards. It is designed for mechanical design purposes and should be used at the user's own risk.

Highlights
  • Metric coarse screw length calculation
  • Conforms to Japanese Industrial Standards (JIS)
  • Designed for mechanical design
  • User risk disclaimer
Features
Read full description

This app is an application for calculating the length of the screw. ※:This app does not guarantee the effectiveness of the combination. ※:Use this application at your own risk. Conforms to the Japanese Industrial Standards (JIS). Screws are all metric coarse screw. For mechanical design. Sorry, Only in Japan.Because using the JIS.

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

Bolt Length4 screens
Thread Calculator4 screens

Verdict

The call

The clearest difference is rating: Thread Calculator at 4.3 against Bolt Length's 3.0. Thread Calculator also leads on in-app purchases (none vs 1) and ratings volume (13 vs 2). On price, review sentiment, update cadence and ads 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. Bolt Length sells 1 one-off in-app purchase. Thread Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Thread Calculator holds the better App Store score, 4.3 against 3.0. That said, the two scores are not equally well evidenced: Thread Calculator has 13 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 33% and 33% positive.

UpkeepUpdate frequency

Bolt Length ships an update every 20 months, Thread Calculator every 18 months. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

Scorecard4 real differences · 6 level
Bolt Length versus Thread Calculator: the parameters behind the verdict, then further details
ParameterBolt LengthThread Calculator
PriceFreeFree
Rating3.0 (2 ratings)4.3 (13 ratings) — better
Positive reviews33.3% of reviews33.3% of reviews
Number of ratings213 — better
Update frequencyEvery 20 monthsEvery 18 months — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.0
Further details — not scored
Size6 MB25 MB
Age rating4+4+
Developermitsunori oishiGSR Gustav Stursberg GmbH

Customer experience

Bolt Length

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews3 reviews
Positive33.3%
Neutral66.7%
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

1 purchases

Bolt Length

One-time1
  • Hide Ads$1.99
None

Thread Calculator

No in-app purchases

Questions

Is Bolt Length free?
Bolt Length is free to download, with in-app purchases available.
Is Thread Calculator free?
Thread Calculator is free to download, with no in-app purchases.
Which has better reviews, Bolt Length or Thread Calculator?
Thread Calculator is rated higher. Bolt Length averages 3.0 out of 5 from 2 ratings, while Thread Calculator averages 4.3 from 13 ratings.
Do Bolt Length or Thread Calculator have ads?
Both Bolt Length and Thread Calculator show ads.
Which is updated more often, Bolt Length or Thread Calculator?
Bolt Length ships an update every 20 months, and Thread Calculator every 18 months. Most recently, Bolt Length was updated on October 8, 2026 and Thread Calculator on October 13, 2026.

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