Bolt Length vs Thread Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Metric coarse screw length calculation
- Conforms to Japanese Industrial Standards (JIS)
- Designed for mechanical design
- User risk disclaimer
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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.
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.
- Thread cutting calculator for multiple units
- Cold forming calculator
- Thread repair calculator
- Tap hole and bolt diameter calculation
- Saves time compared to tables
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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
Verdict
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
Both are free to download. Bolt Length sells 1 one-off in-app purchase. Thread Calculator asks for nothing beyond the download.
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.
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.
| Parameter | Bolt Length | Thread Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 4.3 (13 ratings) — better |
| Positive reviews | 33.3% of reviews | 33.3% of reviews |
| Number of ratings | 2 | 13 — better |
| Update frequency | Every 20 months | Every 18 months — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 6 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | mitsunori oishi | GSR Gustav Stursberg GmbH |
Customer experience
Bolt Length
Thread Calculator
In-app purchases
Bolt Length
- Hide Ads$1.99
Thread Calculator
No in-app purchases
Questions
Is Bolt Length free?
Is Thread Calculator free?
Which has better reviews, Bolt Length or Thread Calculator?
Do Bolt Length or Thread Calculator have ads?
Which is updated more often, Bolt Length or Thread Calculator?
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