# i vs CNC Blue

The clearest difference is price: i at Free against CNC Blue's $2.99. CNC Blue's advantage is update cadence (every 3 days vs every 13 months) and review sentiment (50% vs 33%). On rating, ratings volume, ads and in-app purchases there is nothing between them.

i is free to download; CNC Blue costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 2.6 for i against 2.5 for CNC Blue. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews are what separate them: 33% of i's written reviews are positive against 50% of CNC Blue's.

i ships an update every 13 months, CNC Blue every 3 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | i | CNC Blue |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[2.6 (9 ratings)](https://appshunter.io/ios/app/i-machinist/id1456473668/reviews)** | [2.5 (4 ratings)](https://appshunter.io/ios/app/cnc-blue/id1507725632/reviews) |
| Number of ratings | **9** | 4 |
| Positive reviews | 33.3% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 days** |
| Monetization | **Free** | Paid |
| Size | 8 MB | 1 MB |
| Requires iOS | 16.0 | **13.5** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ilan TETRUASHVILI](https://appshunter.io/developer/940821251) | [Mehmet SIMSEK](https://appshunter.io/developer/740675946) |

## 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, Vision Pro support

**In-app purchases:** none


### CNC Blue

[App page](https://appshunter.io/ios/app/cnc-blue/id1507725632)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is i free?

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

### Is CNC Blue free?

CNC Blue costs $2.99, with no in-app purchases.

### Which has better reviews, i or CNC Blue?

i is rated higher. i averages 2.6 out of 5 from 9 ratings, while CNC Blue averages 2.5 from 4 ratings.

### Do i or CNC Blue have ads?

Neither i nor CNC Blue shows ads.

### Which is updated more often, i or CNC Blue?

i ships an update every 13 months, and CNC Blue every 3 days. Most recently, i was updated on November 2, 2026 and CNC Blue on November 3, 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.*