# Source vs HowCal 厚呷

The clearest difference is in-app purchases: HowCal 厚呷 at none against Source's 3. HowCal 厚呷 also leads on update cadence (every 3 days vs fortnightly). Source's advantage is iOS requirement (15.1 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. Source sells 3 in-app purchases, starting at $7.99 per month. HowCal 厚呷 asks for nothing beyond the download.

Source ships an update fortnightly, HowCal 厚呷 every 3 days. The most recent releases landed on September 11, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | Source | HowCal 厚呷 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 62 MB | 2 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [CHANG-WEI FU](https://appshunter.io/developer/1837600448) | [CHUNG-CHING WONG](https://appshunter.io/developer/1875561053) |

## What reviewers say

### Source

[App page](https://appshunter.io/ios/app/source-ai-copilot/id6756547151)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Source Pro (月費) | $7.99 | per month |
| Source Pro (年費) | $49.99 | per year |
| Source Pro 創始會員 | $99.99 | one-time |


### HowCal 厚呷

[App page](https://appshunter.io/ios/app/howcal/id6758891172)

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

**In-app purchases:** none


## Frequently asked questions

### Is Source free?

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

### Is HowCal 厚呷 free?

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

### Do Source or HowCal 厚呷 have ads?

Neither Source nor HowCal 厚呷 shows ads.

### Which is updated more often, Source or HowCal 厚呷?

Source ships an update fortnightly, and HowCal 厚呷 every 3 days. Most recently, Source was updated on September 11, 2026 and HowCal 厚呷 on June 5, 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.*