Comparison

MechTab vs GD&T

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • ISO-Tolerance data (holes and shafts)
  • Thread specifications
  • Cutting data calculations
  • Wrench size conversions
  • Roughness parameters
  • Material weight calculator
  • Triangle property calculator
Features
Read full description

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

About

GD&T

Read full description

Learn, interpret and inspect GD&T according to ISO 1101. This app describes a large range of definitions of geometric dimensioning and tolerancing and supports engineers and employees as a multimedia reference book. As part of operative education, this app shows relationships and makes it easier to understand the right handling of form and position tolerances in practice. This app explains the most important definitions of GD&T and its interpretation by examples (straightness, roundness, flatness, cylindricity, profile of a line, parallelism, squareness, angularity, position, concentricity, symmetry, circular runout, …) -25 animations -Basic information -Form tolerance -Profile tolerance -Position tolerance -Orientation tolerance -Runout tolerance

Screenshots

MechTab4 screens
GD&T4 screens

Verdict

The call

MechTab and GD&T are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

UpkeepUpdate frequency

MechTab ships an update every 9 months, GD&T every 11 months. The most recent releases landed on November 6, 2026 and October 26, 2026 respectively.

ScorecardNo meaningful differences
MechTab versus GD&T: the parameters behind the verdict, then further details
ParameterMechTabGD&T
PriceFreeFree
Rating4.1 (16 ratings) — better—
Positive reviews88.6% of reviews—
Number of ratings16 — better—
Update frequencyEvery 9 months — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.015.0
Further details — not scored
Size9 MB56 MB
Age rating4+4+
DeveloperWerder AGCarl Zeiss AG

In-app purchases

None

MechTab

No in-app purchases

None

GD&T

No in-app purchases

Questions

Is MechTab free?
MechTab is free to download, with no in-app purchases.
Is GD&T free?
GD&T is free to download, with no in-app purchases.
Do MechTab or GD&T have ads?
Neither MechTab nor GD&T shows ads.
Which is updated more often, MechTab or GD&T?
MechTab ships an update every 9 months, and GD&T every 11 months. Most recently, MechTab was updated on November 6, 2026 and GD&T on October 26, 2026.

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