# CPI pro vs Arc Calculator Pro

The clearest difference is price: CPI pro at Free against Arc Calculator Pro's $3.99. CPI pro also leads on update cadence (every 3 weeks vs every 41 months) and iOS requirement (8.0 vs 16.1). On review sentiment, ads, in-app purchases and device support there is nothing between them.

CPI pro is free to download; Arc Calculator Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CPI pro ships an update every 3 weeks, Arc Calculator Pro every 41 months. The most recent releases landed on October 14, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | CPI pro | Arc Calculator Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/cpi-pro/id1214833658/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 41 months |
| Monetization | **Free** | Paid |
| Size | 135 MB | 2 MB |
| Requires iOS | **8.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [SHENZHEN MILESEEY TECHNOLOGY CO.LTD](https://appshunter.io/developer/1563678294) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## What reviewers say

### CPI pro

[App page](https://appshunter.io/ios/app/cpi-pro/id1214833658)

This utility app allows users to measure distances and sketch floor plans. It can mark dimensions on photos, record data in spreadsheets, and export drawings as photos or PDFs for easy sharing.

**Highlights:** Distance measurement, Floor plan sketching, Marking distances on photos, Data recording in Excel, Export as photo and PDF, Sharing functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### Arc Calculator Pro

[App page](https://appshunter.io/ios/app/arc-calculator-pro/id1491369908)

This utility app provides precise calculations for various arc measurements, including length, angle, radius, and area. It supports both millimeters and inches, making it ideal for fabrication and engineering tasks. The app is designed for high performance and offline use.

**Highlights:** Arc Length Calculation, Arc Angle Calculation, Arc Radius Calculation, Arc Segment Area Calculation, Arc Sector Area Calculation, Supports mm and inches, Offline functionality

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CPI pro free?

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

### Is Arc Calculator Pro free?

Arc Calculator Pro costs $3.99, with no in-app purchases.

### Do CPI pro or Arc Calculator Pro have ads?

Neither CPI pro nor Arc Calculator Pro shows ads.

### Which is updated more often, CPI pro or Arc Calculator Pro?

CPI pro ships an update every 3 weeks, and Arc Calculator Pro every 41 months. Most recently, CPI pro was updated on October 14, 2026 and Arc Calculator Pro on October 17, 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.*