Comparison

GD & T Guide vs WS Drill Bits

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

Head to head
About

GD & T Guide

This app provides a digital version of a pocket guide to Geometric Dimensioning and Tolerancing (GD&T). It explains GD&T symbols, their application on engineering drawings, and common inspection techniques. It also includes tools for converting measurements and calculating position tolerances.

Highlights
  • GD&T symbol descriptions
  • Engineering drawing application
  • Inspection techniques
  • Reporting methods
  • Measurement conversion tool
  • Fastener formula calculator
Features
Read full description

This is an App version of our best-selling printed pocket guide on Geometric Dimensioning and Tolerancing (GD&T). In its 77 pages, it will give a description of GD&T symbols and their use on engineering drawings. Common inspection techniques and reporting methods are also included in the descriptions. There is a conversion app for X, Y rectangular measurements to position tolerance zones. There is a fixed and floating fastener formula App to calculate position tolerances using the standard screw and drilled clearance holes. Available in both inch and mm.

About

WS Drill Bits

This application serves machinists, designers, and manufacturing personnel with essential drill bit calculations. It features a comprehensive drill size chart with decimal equivalents, a calculator for optimal speeds and feeds across various materials, and a tool for determining drill point depth based on angle.

Highlights
  • Drill size and decimal equivalent chart
  • Fast vertical scrolling with color-coded values
  • Sliding scale for quick list navigation
  • Speeds and feeds calculator for various materials
  • Drill point depth calculator
  • Supports metric and inch measurements
Features
Read full description

Workshop (WS) Drill Bits Is a full functioning Drill Bit Calculator simply designed for the Machinists Workshop, Designer's and Manufacturing Personel. Contains the following three functions: 1) A vertical scrolling Drill Size and Decimal Equivalent Chart. *From 0.1mm(0.00394 Inch) to 101.6mm(4.0 Inches) *Offers Fast Vertical Scrolling *Inch Fractions are highlighted in Blue *Metric Numbers are highlighted in Red *Gage/Letter Numbers are also listed *Inch Fractions values are also listed. *A sliding scale allows you to jump to any point on the list fast.(Separately for both mm and inch values) 2) Twist Drill Speeds and Feeds *Calculates recommended Drill Speeds and Feed Rates for various materials: *Option to enter in either Metric or Inch size Drills -Aluminium -Brass -Bronze -Cast Iron -Hastelloy -Inconel -Magnesium -Monel -High Nickel Steel -Free Cutting Steel -Mild Steel -Steel -Tool Steel -Forgings -Alloys -Heat Treated Steels -Stainless Steels -Titanium -Wood and Plastics 3) Drill Point Depth Calculator *Calculates the Drill Point Depth for various Drill Point Angles (60',82',90',118',120',135') *Option to enter in either Metric or Inch size Drills.

Screenshots

GD & T Guide3 screens
WS Drill Bits4 screens

Verdict

The call

The clearest difference is rating: WS Drill Bits at 5.0 against GD & T Guide's 3.0. WS Drill Bits also leads on in-app purchases (none vs 2) and iOS requirement (9.0 vs 11.0). GD & T Guide's advantage is update cadence (every 5 months vs every 16 months) and ratings volume (9 vs 2). On price, ads and device support 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. GD & T Guide sells 2 one-off in-app purchases. WS Drill Bits asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

WS Drill Bits holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 9 and 2 respectively.

UpkeepUpdate frequency

GD & T Guide ships an update every 5 months, WS Drill Bits every 16 months. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

Scorecard6 real differences · 4 level
GD & T Guide versus WS Drill Bits: the parameters behind the verdict, then further details
ParameterGD & T GuideWS Drill Bits
PriceFreeFree
Rating3.0 (9 ratings)5.0 (2 ratings) — better
Positive reviews20.0% of reviews—
Number of ratings9 — better2
Update frequencyEvery 5 months — betterEvery 16 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.09.0 — better
Further details — not scored
Size55 MB57 MB
Age rating17+4+
DeveloperGeoTol Inc.Rein Rapp

Customer experience

GD & T Guide

All ratings9 ratings
Positive44.4%
Neutral0.0%
Negative55.6%
Written reviews5 reviews
Positive20.0%
Neutral0.0%
Negative80.0%

WS Drill Bits

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

GD & T Guide

One-time2
  • Full Book$1.99
  • Geometric Dimensioning and Tec$3.99
None

WS Drill Bits

No in-app purchases

Questions

Is GD & T Guide free?
GD & T Guide is free to download, with in-app purchases available.
Is WS Drill Bits free?
WS Drill Bits is free to download, with no in-app purchases.
Which has better reviews, GD & T Guide or WS Drill Bits?
WS Drill Bits is rated higher. GD & T Guide averages 3.0 out of 5 from 9 ratings, while WS Drill Bits averages 5.0 from 2 ratings.
Do GD & T Guide or WS Drill Bits have ads?
Neither GD & T Guide nor WS Drill Bits shows ads.
Which is updated more often, GD & T Guide or WS Drill Bits?
GD & T Guide ships an update every 5 months, and WS Drill Bits every 16 months. Most recently, GD & T Guide was updated on October 14, 2026 and WS Drill Bits on October 16, 2026.

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