MechTab vs Bolt Length
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MechTab
This app offers a comprehensive set of tools for mechanics, providing essential data on tolerances, threads, cutting speeds, wrench sizes, and roughness. It also includes calculators for material weight, triangle properties, and trowalisation.
- ISO-Tolerance data (holes and shafts)
- Thread specifications
- Cutting data calculations
- Wrench size conversions
- Roughness parameters
- Material weight calculator
- Triangle property calculator
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Werder AG introduces the ultimate tool for mechanics. MechTab provides information about ISO-Tolerances, Threads, Cutting Data, Wrench Size and Roughness. Tolerances: A - ZC, holes and shafts General Tolerances: Charts for linear dimensions, radii/chamfer and angular dimensions. Geometrical Tolerances: Symbols, drawings and explanations as well as charts for the different geometrical tolerances. Threads: BA, BSF, G, Heli-Coil, M, MF, Pg, Tr, UNC, UNEF, UNF, W, Metric-Non-Standard Cutting Data: Cutting Speed and Spindle Speed, Feed Rates, Processing duration Wrench-Size to Width across Corners: 4-,6-8-,10-,12-,14-Cornered Torque: 3.6, 6.9, 8.8, 10.9, 12.9 Roughness: Rz, Ra, N, Triangle-Notation Weight: calculate the weight of different materials in different profiles. Material list is editable. Triangle: calculate sides, angles and the area of a triangle by entering 3 values according to a drawing. Trowalisation: calculate the number of pieces
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.
Screenshots
Verdict
The clearest difference is review sentiment: MechTab at 89% against Bolt Length's 33%. MechTab also leads on rating (4.1 vs 3.0) and in-app purchases (none vs 1). On price, 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
Both are free to download. Bolt Length sells 1 one-off in-app purchase. MechTab asks for nothing beyond the download.
MechTab holds the better App Store score, 4.1 against 3.0. That said, the two scores are not equally well evidenced: MechTab has 16 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 89% of MechTab's written reviews are positive against 33% of Bolt Length's.
MechTab ships an update every 9 months, Bolt Length every 20 months. Both last shipped on November 1, 2026.
| Parameter | MechTab | Bolt Length |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (16 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 88.6% of reviews — better | 33.3% of reviews |
| Number of ratings | 16 — better | 2 |
| Update frequency | Every 9 months — better | Every 20 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Werder AG | mitsunori oishi |
Customer experience
MechTab
Bolt Length
In-app purchases
MechTab
No in-app purchases
Bolt Length
- Hide Ads$1.99
Questions
Is MechTab free?
Is Bolt Length free?
Which has better reviews, MechTab or Bolt Length?
Do MechTab or Bolt Length have ads?
Which is updated more often, MechTab or Bolt Length?
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