Best G-Code Viewer & Converter Apps

250+ iOS apps curated and reviewed

4.3 avg rating
19 free apps
Updated September 2026

Finding the right g-code viewer & converter apps can be overwhelming with so many options. We've analyzed 250+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.

Compare top G-Code Viewer & Converter Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Sequence :: G-Code editor, CNCSequence :: G-Code editor, CNCFree4.3★ (64)NoYesSep 2026
23D File Viewer: OBJ STP & more3D File Viewer: OBJ STP & moreFree4.5★ (48)NoYesAug 2026
3G-Code Viewer & ConverterG-Code Viewer & Converter$1.99 was $2.993.0★ (2)NoNoAug 2026
4G Code ConverterG Code ConverterFreeNoNoMay 2026
5G-Codes CardsG-Codes CardsFreeNoNoJul 2026
6GCode Scanner for CNC MachinesGCode Scanner for CNC MachinesFree5.0★ (3)NoYesAug 2026
7DWG FastView-CAD Viewer&EditorDWG FastView-CAD Viewer&EditorFree4.5★ (1.1K)YesYesSep 2026
8GCodeReader CNCGCodeReader CNCFreeNoNoJun 2026

Top Picks for G-Code Viewer & Converter

Sequence :: G-Code editor, CNC#1

Sequence :: G-Code editor, CNC by Hypercube GFX, Inc.

Machining, CAD Modeling, CAM
Editor's Choice
🎨 Graphics & Design
4.3(64 ratings)
FreeIn-App Purchases
Sequence :: G-Code editor, CNC screenshot 1
Sequence :: G-Code editor, CNC screenshot 2
Sequence :: G-Code editor, CNC screenshot 3
Sequence :: G-Code editor, CNC screenshot 4
Sequence :: G-Code editor, CNC screenshot 5

This app is a text editor for G-Code and M-Code, designed for machining on CNC and lathe machines. It allows users to import, save, and visualize STL models with a built-in 3D renderer. Subscriptions are available and can be canceled anytime.

3D File Viewer: OBJ STP & more#2

3D File Viewer: OBJ STP & more by Andeesh Mehdi Syed

STP STL OBJ FBX GLTF & More
Strong Contender
🔧 Utilities
4.5(48 ratings)
FreeIn-App Purchases
3D File Viewer: OBJ STP & more screenshot 1
3D File Viewer: OBJ STP & more screenshot 2
3D File Viewer: OBJ STP & more screenshot 3

Easily open and explore 3D model files on your iPhone or iPad. Supports over 20 popular formats, offering smooth viewing with intuitive touch controls. Ideal for designers, engineers, architects, and students working with 3D data.

G-Code Viewer & Converter#3

G-Code Viewer & Converter by Victor Bovio

for GCODE, CNC, NGC, NC files
Worth Considering
📊 Productivity
3.0(2 ratings)
$1.99
G-Code Viewer & Converter screenshot 1
G-Code Viewer & Converter screenshot 2
G-Code Viewer & Converter screenshot 3
G-Code Viewer & Converter screenshot 4
G-Code Viewer & Converter screenshot 5

Easily view and convert CNC machine code files on your mobile device. Supports various export formats like PDF, SVG, DXF, and IGES. Load files directly from compressed archives for convenient access.

More G-Code Viewer & Converter apps to explore

4
G Code Converter
G Code Converter
G Code Converter
Printer-Safe G-code Conversion
Free
🎨 Graphics & Design
(0)
5
G-Codes Cards
G-Codes Cards
G-Codes Cards
by Noam Durgnat
Free
📚 Education
(0)
6
GCode Scanner for CNC Machines
GCode Scanner for CNC Machines
GCode Scanner for CNC Machines
Machinist Toolkit, AI Chatbot
Free

This tool allows users to view and simulate CNC machine code (G-code) and 3D model files (STL) before production. It helps prevent errors, save tools, and reduce setup times for machinists, programmers, and engineers.

G-code viewer with real-time toolpath playbackError detection for gouges and over-travelsSTL model viewer
🔧 Utilities
(3)
free with in-app purchases
7
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
* Support 2D/3D CAD formats
Free

This cross-platform CAD application allows users to view, edit, and create 2D and 3D designs on the go. It supports a wide range of file formats and offers advanced tools for precise drawing, measurement, and annotation, even offline.

View and edit 2D/3D CAD drawingsSupports over 40 3D drawing formatsAccurate measurement and annotation tools
📊 Productivity
(1.1K)
free with in-app purchases
8
GCodeReader CNC
GCodeReader CNC
GCodeReader CNC
by Favionics
Free
🎨 Graphics & Design
(0)
9
Pathly: G-code Viewer
Pathly: G-code Viewer
Pathly: G-code Viewer
G-code Viewer
Free
🔧 Utilities
(0)
10
3D Converter and Viewer
3D Converter and Viewer
3D Converter and Viewer
Viewing 3D objects
Free
🛠️ Developer Tools
(0)
11
CodeViewer - Code Reader
CodeViewer - Code Reader
CodeViewer - Code Reader
Code view, Syntax highlighting
Free
🛠️ Developer Tools
(0)
12
Koder Code Editor
Koder Code Editor
Koder Code Editor
(S)FTP, Dropbox, Webdav, SSH
Free

A powerful code editor for mobile devices, offering syntax highlighting for over 80 languages, remote file access, and a built-in terminal. Perfect for developers who need to code on the go with a well-designed interface.

Syntax highlighting for 80+ languagesRemote file access (SFTP, Dropbox, WebDAV)Built-in SSH client
🛠️ Developer Tools
(12K)
paid
13
Kandce Fetime - Code Scanner
Kandce Fetime - Code Scanner
Kandce Fetime - Code Scanner
by Ishfak Tanvir
Free
🔧 Utilities
(0)
14
Convert Sci:Simple Converter
Convert Sci:Simple Converter
Convert Sci:Simple Converter
by Sacan Halime
Free
🔧 Utilities
(0)
15
GCode Compare
GCode Compare
GCode Compare
Side-by-side G-code diff tool
Free
🔧 Utilities
(0)
16
GlassCode - Code Editor
GlassCode - Code Editor
GlassCode - Code Editor
Your pocket code editor & IDE
Free
🛠️ Developer Tools
(0)
17
Hangul Office Viewer(hwp,hwpx)
Hangul Office Viewer(hwp,hwpx)
Hangul Office Viewer(hwp,hwpx)
HWP,HWPX,MS Office Doc Viewer
Free

Easily view and manage Hangul (HWP, HWPX) documents along with a wide range of other office file formats. Convert documents to PDF for seamless sharing and utilize smart management features like recents and favorites. Enjoy a comfortable viewing experience with dark mode.

HWP/HWPX document viewingSupport for PDF, DOCX, XLSX, PPTXConvert documents to PDF
💼 Business
(0)
free with in-app purchases
18
Fast Barcode Scan & QR Maker
Fast Barcode Scan & QR Maker
Fast Barcode Scan & QR Maker
by Cem Ilgun
Free
🔧 Utilities
(0)
19
STEP Viewer
STEP Viewer
STEP Viewer
Fast STEP File Viewer
Free
📊 Productivity
(0)
20
QR Code Studio: Scan & Create
QR Code Studio: Scan & Create
QR Code Studio: Scan & Create
Generate, Read & Track Easily
Free
🔧 Utilities
(0)

FAQ about G-Code Viewer & Converter

What are the best g-code viewer & converter apps for iPhone?
Sequence :: G-Code editor, CNC tops our g-code viewer & converter apps ranking as of September 2026, with a 4.3-star average from 64 App Store ratings, and it's free to download.
Yes — 19 of the top g-code viewer & converter apps we rank are free to download, including Sequence :: G-Code editor, CNC and 3D File Viewer: OBJ STP & more.
Sequence :: G-Code editor, CNC has no ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 250+ g-code viewer & converter apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
Sequence is a text editor specifically designed for editing G-Code and M-Code for machining on CNC and lathe machines. It also supports importing, saving, and visualizing STL models.
Sequence is available for both iPhone and iPad devices, making it accessible for users on the go or in the workshop.