# i vs Arc+

The clearest difference is rating: Arc+ at 4.6 against i's 2.6. Arc+ also leads on update cadence (every 4 months vs every 13 months) and review sentiment (50% vs 33%). i's advantage is in-app purchases (none vs 1). On price, ads, monetization model and iOS requirement there is nothing between them.

Both are free to download. Arc+ sells 1 one-off in-app purchase. i asks for nothing beyond the download.

Arc+ holds the better App Store score, 4.6 against 2.6. That said, the two scores are not equally well evidenced: Arc+ has 118 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 33% of i's written reviews are positive against 50% of Arc+'s.

i ships an update every 13 months, Arc+ every 4 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | i | Arc+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (9 ratings)](https://appshunter.io/ios/app/i-machinist/id1456473668/reviews) | **[4.6 (118 ratings)](https://appshunter.io/ios/app/arc-plus/id1464058503/reviews)** |
| Number of ratings | 9 | **118** |
| Positive reviews | 33.3% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 8 MB | 4 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ilan TETRUASHVILI](https://appshunter.io/developer/940821251) | [Mohamed Saad](https://appshunter.io/developer/1291109619) |

## 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


### Arc+

[App page](https://appshunter.io/ios/app/arc-plus/id1464058503)

This utility app helps users calculate various dimensions of circular arcs, including radius, length, width, and height. It offers a simple interface where users input two known values to derive the rest. Additional features include a unit converter, result saving, and sharing capabilities.

**Highlights:** Calculate Radius, Length, Width, Height, Tangent, Input two known values to find others, Measurement units converter, Save results to favorites, Share calculations

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad Blocker | $4.99 | one-time |


## Frequently asked questions

### Is i free?

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

### Is Arc+ free?

Arc+ is free to download, with in-app purchases available.

### Which has better reviews, i or Arc+?

Arc+ is rated higher. i averages 2.6 out of 5 from 9 ratings, while Arc+ averages 4.6 from 118 ratings.

### Do i or Arc+ have ads?

Neither i nor Arc+ shows ads.

### Which is updated more often, i or Arc+?

i ships an update every 13 months, and Arc+ every 4 months. Most recently, i was updated on October 24, 2026 and Arc+ on October 24, 2026.

---

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