# CastleBird vs PowAI

The clearest difference is in-app purchases: CastleBird at none against PowAI's 2. PowAI's advantage is update cadence (every 4 days vs every 3 months) and iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. PowAI sells 2 in-app purchases, starting at $3.99 per month. CastleBird asks for nothing beyond the download.

CastleBird ships an update every 3 months, PowAI every 4 days. The most recent releases landed on October 1, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CastleBird | PowAI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 93 MB | 48 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [CastleBird](https://appshunter.io/developer/1689612442) | [矾建 孔](https://appshunter.io/developer/1481446695) |

## What reviewers say

### CastleBird

[App page](https://appshunter.io/ios/app/castlebird/id6449547159)

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

**In-app purchases:** none


### PowAI

[App page](https://appshunter.io/ios/app/powai/id6450531487)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Monthly | $3.99 | per month |
| Standard Yearly | $39.99 | per year |


## Frequently asked questions

### Is CastleBird free?

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

### Is PowAI free?

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

### Do CastleBird or PowAI have ads?

Neither CastleBird nor PowAI shows ads.

### Which is updated more often, CastleBird or PowAI?

CastleBird ships an update every 3 months, and PowAI every 4 days. Most recently, CastleBird was updated on October 1, 2026 and PowAI on October 10, 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.*