Comparison

CNC Blue vs GCode Generator

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

Head to head
About

CNC Blue

Control your 3-axis CNC machine via Bluetooth using your iOS device. Generate G-code for various shapes and drawings, then send it directly to your Arduino CNC shield.

Highlights
  • 3-axis CNC control via Bluetooth
  • G-code generation for shapes (circle, polygon, star, etc.)
  • Custom drawing to G-code conversion
  • 3D preview of generated designs
  • Save and share G-code files
  • Direct G-code sending to Arduino
Features
Currently charting
Read full description

You can control 3 axis of your CNC milling machine which connected Arduino CNC shield with a suitable bluetooth module for iOS device at baud rate 9600. The application has G code build function modules which are circle, polygon, star, rectangle, arc, draw, gear and spiral modules.  Some modules has cut inside and cut deep functions. You can select cut tool diameter. Draw module is another fantastic mode to allow to you can use on milling what you draw on the screen with selectable depth of cut function. Before use this function you have to calculate your CNC working area to fit your drawing to this area. All these modules can capable record builded G codes to a file with module name.For save G codes you have to open "save all calculations to files" switch from setting menu. You can share builded G codes. And you can send received Gcode to Arduino via bluetooth with send page, only load the received .nc file. All builded G codes automatically transfer send page, you need to touch send button to start cnc milling, application will send your Gcode to Arduino via bluetooth connection which you done from the application. You can share with airdrop, e-mail etc. all .nc files on the Files page. And polygon, star, rectangle, arc, draw, gear, spiral modes has 3D view function to show you what you build in 3D view . *IMPORTANT: The CNC Blue application has Stop button, but FOR YOUR SAFETY YOU HAVE TO USE YOUR OWN EMERGENCY STOP BUTTON WITH WIRE CONNECTED TO YOUR ARDUINO CNC SHIELD in case of needed to use.* Why I need to change baud rate to 9600: The application baud rate 9600. Because of that we need to change baud rate of Grbl from config.h file to correctly communicate with Grbl via bluetooth module. How you can set baud rate to 9600; You can find the Arduino Grbl "config.h" file from "documents/arduino/libraries/grbl/config.h" and change baud rate to #define BAUD_RATE 9600 How to connect your bluetooth module to Arduino CNC shield : Bluetooth module "TX" to Arduino CNC shield "RX", Bluetooth module "RX" to Arduino CNC shield "TX", Bluetooth module "VCC" to Arduino CNC shield "3V3", Bluetooth module "GND" to Arduino CNC shield "GND" Pins must be connected correctly to protect your Arduino-CNC shield and bluetooth module.

About

GCode Generator

This utility transforms images into high-quality G-Code for CNC machines, laser engravers, and plotters. It offers advanced controls for fine-tuning output and is designed for makers and professionals.

Highlights
  • Image to G-Code conversion
  • Advanced parameter controls
  • High-precision output
  • Export and share G-Code
  • Fast and easy to use
Read full description

Turn any image into high-quality G-Code with just one tap. Gcode Generator is a powerful and easy-to-use tool designed for CNC machines, laser engravers, plotters, and robotics projects. Features Image to G-Code Conversion Upload any image and generate clean G-Code instantly. Advanced Controls Adjust sample count, line density, center position, scaling, and other fine-tuning parameters. High-Precision Output Generate smooth curves, accurate paths, and machine-ready G-Code. Export and Share Save your generated G-Code Fast and Easy Built for makers, engineers, hobbyists, and CNC professionals. Whether you're engraving artwork, running a plotter, or preparing CNC projects, Gcode Generator provides a simple and efficient solution for generating G-Code. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

CNC Blue4 screens
GCode Generator4 screens

Verdict

The call

The clearest difference is price: GCode Generator at Free against CNC Blue's $2.99. GCode Generator also leads on rating (5.0 vs 2.5). CNC Blue's advantage is in-app purchases (none vs 8) and update cadence (every 3 days vs every 6 weeks). On 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

GCode Generator is free to download; CNC Blue costs $2.99 up front. GCode Generator sells 8 in-app purchases, starting at $1.99 per 7 days. CNC Blue asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

GCode Generator holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

UpkeepUpdate frequency

CNC Blue ships an update every 3 days, GCode Generator every 6 weeks. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

Scorecard8 real differences · 3 level
CNC Blue versus GCode Generator: the parameters behind the verdict, then further details
ParameterCNC BlueGCode Generator
Price$2.99Free — better
Rating2.5 (4 ratings)5.0 (1 ratings) — better
Positive reviews50.0% of reviews—
Number of ratings4 — better1
Update frequencyEvery 3 days — betterEvery 6 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#196 — better—
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.5 — better15.1
Further details — not scored
Size1 MB75 MB
Age rating4+4+
DeveloperMehmet SIMSEKOmer Faruk BAGCI

Customer experience

CNC Blue

All ratings4 ratings
Positive25.0%
Neutral25.0%
Negative50.0%
Written reviews4 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

GCode Generator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

CNC Blue

No in-app purchases

8 purchases

GCode Generator

Subscriptions5
  • GCode Weekly$1.997 Days
  • GCode Pro Weekly$3.997 Days
  • GCode Monthly$4.991 Month
Show 2 more
  • GCode Pro Monthly$8.991 Month
  • G-Code Pro Yearly$39.991 Year
One-time3
  • 15 Credits$1.99
  • 30 Credits$2.99
  • 50 Credits$3.99

Questions

Is CNC Blue free?
CNC Blue costs $2.99, with no in-app purchases.
Is GCode Generator free?
GCode Generator is free to download, with in-app purchases available.
Which has better reviews, CNC Blue or GCode Generator?
GCode Generator is rated higher. CNC Blue averages 2.5 out of 5 from 4 ratings, while GCode Generator averages 5.0 from 1 ratings.
Do CNC Blue or GCode Generator have ads?
Neither CNC Blue nor GCode Generator shows ads.
Which is updated more often, CNC Blue or GCode Generator?
CNC Blue ships an update every 3 days, and GCode Generator every 6 weeks. Most recently, CNC Blue was updated on October 8, 2026 and GCode Generator on October 1, 2026.

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