Comparison

Bolt Length vs Triangle3

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

Triangle3

This app provides advanced calculation tools for field work, specializing in right and unequal triangles. It supports complex shapes like cones, pipes, and screw wings, with AR visualization for floor plans. It also includes standard calculator functions and memory features.

Highlights
  • Right and unequal triangle calculations
  • Complex shape development (cones, pipes, etc.)
  • Augmented Reality (AR) floor plan visualization
  • Standard calculator functions with memory
  • Trigonometric and cosine theorem calculations
  • PCD and screw wing calculations
Features
Read full description

This is a calculator application created by me, a canner, focusing on the functions of a calculator necessary for field work. Even if you don't understand trigonometric functions, you can easily calculate with this calculator. It can calculate right triangles and unequal triangles. It can calculate memory, answer memory, pi, repetition, parentheses, trigonometric functions, and cosine theorem. Develop cones (including misalignment), diagonal cuts, R-cuts, T-pipes, shrimp tubes, rounded corners, rounded corners (eccentricity), hopper eccentricity, pipes from mirror plates, connecting pipes to tapered pipes, screw wings, and calculate PCD. It is possible to display the development on the floor in full size with AR for a specific development. User's Manual ############################ Calculator section Press and hold the "ANS" button to display past calculation results. Tap the label of the calculation result (right after pressing =) to mark the value in the ANS list. Tap the white button to enter the value displayed on the label. Swipe the screen to the left or right to rotate the right triangle. Swipe the screen up and down to flip the right triangle. Enter two right triangles and three unequal triangles. Tap the "Cal" button to display the calculation result. Tap "Cl" button to clear the displayed value. You can also use the "0" label to erase only the specified locations. If you touch the button and slide it down, the numerical value of the calculation result will be displayed on the label, and can be used for the next calculation. Trigonometric calculations can be done with By sliding the [4] and [6] buttons, you can go back and forward. Pressing the CLR button once will erase the number. Press twice to reset the rotation. Press and hold to erase numbers, reset rotation, and erase memory. Press and hold to erase numbers, reset rotation, and clear memory. Automatic input of pipe outline Example 50A -> Input "5", "0", "1 slide".   1¼B -> Input "1", "4", "1" and "2 slides". Each slide twice in succession will reduce the value by half. Expansion section The input method is the same as in the calculator section. To expand a pipe, PCD, or mirror, slide the screen to the left or right to select the expansion diagram. Basically, all buttons need to be entered, but in some places "0" can be used. For round corners (eccentricity), double-tap the screen after entering the numerical value for round corners to switch to the input screen. Please enter the division of the circumference in multiples of 4. The calculation result is an image, so it may differ from the actual shape. Disclaimer Although every effort has been made to ensure the accuracy of the calculation results in this application, the accuracy is not guaranteed. Please note that we are not responsible for any damage, loss, or disadvantage caused by the use of this application.

Screenshots

Bolt Length4 screens
Triangle34 screens

Verdict

The call

The clearest difference is price: Bolt Length at Free against Triangle3's $3.99. Triangle3's advantage is in-app purchases (none vs 1) and ads (none vs shown). On review sentiment, device support and iOS requirement 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

Bolt Length is free to download; Triangle3 costs $3.99 up front. Bolt Length sells 1 one-off in-app purchase. Triangle3 asks for nothing beyond the download.

UpkeepUpdate frequency

Bolt Length ships an update every 20 months, Triangle3 every 5 weeks. The most recent releases landed on October 8, 2026 and October 17, 2026 respectively.

Scorecard5 real differences · 5 level
Bolt Length versus Triangle3: the parameters behind the verdict, then further details
ParameterBolt LengthTriangle3
PriceFree — better$3.99
Rating3.0 (2 ratings) — better—
Positive reviews33.3% of reviews40.0% of reviews — better
Number of ratings2 — better—
Update frequencyEvery 20 monthsEvery 5 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS14.0 — better15.0
Further details — not scored
Size6 MB7 MB
Age rating4+4+
Developermitsunori oishiryo sasaki

Customer experience

Bolt Length

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews3 reviews
Positive33.3%
Neutral66.7%
Negative0.0%

Triangle3

Written reviews10 reviews
Positive40.0%
Neutral30.0%
Negative30.0%

In-app purchases

1 purchases

Bolt Length

One-time1
  • Hide Ads$1.99
None

Triangle3

No in-app purchases

Questions

Is Bolt Length free?
Bolt Length is free to download, with in-app purchases available.
Is Triangle3 free?
Triangle3 costs $3.99, with no in-app purchases.
Do Bolt Length or Triangle3 have ads?
Bolt Length shows ads; Triangle3 does not.
Which is updated more often, Bolt Length or Triangle3?
Bolt Length ships an update every 20 months, and Triangle3 every 5 weeks. Most recently, Bolt Length was updated on October 8, 2026 and Triangle3 on October 17, 2026.

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