# i vs GCode Scanner for CNC Machines

The clearest difference is review sentiment: GCode Scanner for CNC Machines at 100% against i's 33%. GCode Scanner for CNC Machines also leads on rating (5.0 vs 2.6) and update cadence (every 3 weeks vs every 16 months). i's advantage is in-app purchases (none vs 3) and ratings volume (9 vs 3). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. GCode Scanner for CNC Machines sells 3 in-app purchases, starting at $4.99 per 7 days. i asks for nothing beyond the download.

GCode Scanner for CNC Machines holds the better App Store score, 5.0 against 2.6. Both are backed by a comparable volume of ratings — 9 and 3 respectively. Written reviews point the same way: 33% of i's written reviews are positive against 100% of GCode Scanner for CNC Machines's.

i ships an update every 16 months, GCode Scanner for CNC Machines every 3 weeks. The most recent releases landed on September 16, 2026 and August 27, 2026 respectively.

## The numbers

| Metric | i | GCode Scanner for CNC Machines |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (9 ratings)](https://appshunter.io/ios/app/i-machinist/id1456473668/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/gcode-scanner-for-cnc-machines/id6747010022/reviews)** |
| Number of ratings | **9** | 3 |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 77 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ilan TETRUASHVILI](https://appshunter.io/developer/940821251) | [Jeremiah Moore](https://appshunter.io/developer/1695450531) |

## What reviewers say

### i

[App page](https://appshunter.io/ios/app/i-machinist/id1456473668)

This utility app assists machinists with CNC calculations, including cutting speed, RPM, and feed rate. It also provides databases for hole and shaft tolerances, as well as detailed thread specifications.

**Highlights:** Cutting speed calculation, RPM calculation, Feed rate calculation, Hole and shaft tolerance database, Thread data, Milling, drilling, and turning operations

**Features:** macOS Compatibility

**In-app purchases:** none


### GCode Scanner for CNC Machines

[App page](https://appshunter.io/ios/app/gcode-scanner-for-cnc-machines/id6747010022)

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.

**Highlights:** G-code viewer with real-time toolpath playback, Error detection for gouges and over-travels, STL model viewer, Universal G-code compatibility, Shop-floor ready interface, Import from cloud storage or local device

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly Membership | $4.99 | per 7 days |
| Pro Monthly Membership | $7.99 | per month |
| Pro Annual Membership | $69.99 | per year |


## Frequently asked questions

### Is i free?

i is free to download, with no in-app purchases.

### Is GCode Scanner for CNC Machines free?

GCode Scanner for CNC Machines is free to download, with in-app purchases available.

### Which has better reviews, i or GCode Scanner for CNC Machines?

GCode Scanner for CNC Machines is rated higher. i averages 2.6 out of 5 from 9 ratings, while GCode Scanner for CNC Machines averages 5.0 from 3 ratings.

### Do i or GCode Scanner for CNC Machines have ads?

Neither i nor GCode Scanner for CNC Machines shows ads.

### Which is updated more often, i or GCode Scanner for CNC Machines?

i ships an update every 16 months, and GCode Scanner for CNC Machines every 3 weeks. Most recently, i was updated on September 16, 2026 and GCode Scanner for CNC Machines on August 27, 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.*