# GD & T Guide vs WS Drill Bits

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.

Both are free to download. GD & T Guide sells 2 one-off in-app purchases. WS Drill Bits asks for nothing beyond the download.

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.

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.

## The numbers

| Metric | GD & T Guide | WS Drill Bits |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (9 ratings)](https://appshunter.io/ios/app/gd-and-t-guide/id1374135977/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ws-drill-bits/id1453137463/reviews)** |
| Number of ratings | **9** | 2 |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 16 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 55 MB | 57 MB |
| Requires iOS | 11.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [GeoTol Inc.](https://appshunter.io/developer/511287932) | [Rein Rapp](https://appshunter.io/developer/1031133571) |

## What reviewers say

### GD & T Guide

[App page](https://appshunter.io/ios/app/gd-and-t-guide/id1374135977)

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:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Book | $1.99 | one-time |
| Geometric Dimensioning and Tec | $3.99 | one-time |


### WS Drill Bits

[App page](https://appshunter.io/ios/app/ws-drill-bits/id1453137463)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*