# CPI vs Rail Shift

The clearest difference is in-app purchases: CPI at none against Rail Shift's 1. Rail Shift's advantage is update cadence (weekly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Rail Shift sells 1 one-off in-app purchase. CPI asks for nothing beyond the download.

CPI ships an update every 2 months, Rail Shift weekly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | CPI | Rail Shift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (12K ratings)](https://appshunter.io/ios/app/cpi-connect-puzzle-image/id6444722992/reviews)** | — |
| Number of ratings | **12K** | — |
| Positive reviews | 80.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 326 MB | 30 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SayGames LTD](https://appshunter.io/developer/1551847165) | [Yuttana Suttasupa](https://appshunter.io/developer/1273947543) |

## What reviewers say

### CPI

[App page](https://appshunter.io/ios/app/cpi-connect-puzzle-image/id6444722992)

This game challenges your thinking skills to connect virtual pieces and create unique images. Enjoy a captivating puzzle experience with progressively complex levels, playable anywhere on your mobile device.

**Highlights:** Connect virtual puzzle pieces, Create unique images, Progressively complex levels, Playable anywhere, Drag and drop gameplay, 100 levels

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

**In-app purchases:** none

**What reviewers like**

- 👍 Fun and rewarding gameplay
- 🧠 Helps with brain development
- 💎 Satisfying puzzles
- 🎉 Calm and relaxing experience

**What reviewers complain about**

- 🔍 Repetitive levels
- 💸 Too many ads

**Reported bugs**

- Levels repeating after a certain point

**Requested features**

- More levels and puzzles
- No ads option


### Rail Shift

[App page](https://appshunter.io/ios/app/rail-shift-cargo-master/id6812201000)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is CPI free?

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

### Is Rail Shift free?

Rail Shift is free to download, with in-app purchases available.

### Do CPI or Rail Shift have ads?

Both CPI and Rail Shift show ads.

### Which is updated more often, CPI or Rail Shift?

CPI ships an update every 2 months, and Rail Shift weekly. Most recently, CPI was updated on November 5, 2026 and Rail Shift on October 31, 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.*