# ReadFlow vs 口笛AI

The clearest difference is in-app purchases: 口笛AI at none against ReadFlow's 3. 口笛AI also leads on update cadence (every 2 days vs every 20 months) and iOS requirement (13.4 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. ReadFlow sells 3 in-app purchases, starting at $0.99 per month. 口笛AI asks for nothing beyond the download.

ReadFlow ships an update every 20 months, 口笛AI every 2 days. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | ReadFlow | 口笛AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/readflow/id6447425350/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 29 MB |
| Requires iOS | 26.0 | **13.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [实 许](https://appshunter.io/developer/681075194) | [bodongyueqian](https://appshunter.io/developer/1796805487) |

## What reviewers say

### ReadFlow

[App page](https://appshunter.io/ios/app/readflow/id6447425350)

This app transforms PDF documents into a comfortable reading experience on small screens. It offers text reflow, customization options for fonts and themes, and iCloud sync for seamless access across devices. Enjoy reading PDFs as easily as other ebook formats.

**Highlights:** PDF text reflow for mobile, Customizable fonts and themes, Import custom font files, iCloud sync, PDF file cropping, Metadata editing, Generate and share reflowed text

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReadFlow Pro 1x | $0.99 | per month |
| ReadFlow Pro 12x | $9.99 | per year |
| ReadFlow Pro ∞ | $19.99 | one-time |


### 口笛AI

[App page](https://appshunter.io/ios/app/ai/id6748106042)

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

**In-app purchases:** none


## Frequently asked questions

### Is ReadFlow free?

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

### Is 口笛AI free?

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

### Do ReadFlow or 口笛AI have ads?

Neither ReadFlow nor 口笛AI shows ads.

### Which is updated more often, ReadFlow or 口笛AI?

ReadFlow ships an update every 20 months, and 口笛AI every 2 days. Most recently, ReadFlow was updated on November 3, 2026 and 口笛AI on October 28, 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.*