# Doublets vs Card Pile Flow

The clearest difference is in-app purchases: Card Pile Flow at none against Doublets's 3. Card Pile Flow also leads on update cadence (every 2 weeks vs every 9 months) and iOS requirement (13.0 vs 17.0). Doublets's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Doublets sells 3 in-app purchases, starting at $0.99 per month. Card Pile Flow asks for nothing beyond the download.

Doublets ships an update every 9 months, Card Pile Flow every 2 weeks. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Doublets | Card Pile Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (3 ratings)](https://appshunter.io/ios/app/doublets/id6737807177/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | Freemium | — |
| Size | 11 MB | 230 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas DiZoglio](https://appshunter.io/developer/1672699438) | [文晚 鲁](https://appshunter.io/developer/1885341239) |

## What reviewers say

### Doublets

[App page](https://appshunter.io/ios/app/doublets/id6737807177)

A word puzzle game where you transform one word into another by changing one letter at a time. Each step must result in a valid dictionary word, following the rules of the classic word ladder game.

**Highlights:** Word ladder gameplay, Change one letter at a time, Valid dictionary words, Classic word puzzle, Single-player game

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Doublets Monthly Subscription | $0.99 | per month |
| Doublets Yearly Subscription | $9.99 | per year |
| Doublets Free Download | Free | one-time |


### Card Pile Flow

[App page](https://appshunter.io/ios/app/card-pile-flow/id6762167723)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Doublets free?

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

### Is Card Pile Flow free?

Card Pile Flow is free to download, with no in-app purchases.

### Do Doublets or Card Pile Flow have ads?

Card Pile Flow shows ads; Doublets does not.

### Which is updated more often, Doublets or Card Pile Flow?

Doublets ships an update every 9 months, and Card Pile Flow every 2 weeks. Most recently, Doublets was updated on October 30, 2026 and Card Pile Flow on November 9, 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.*