# iDraw OSC vs API Zen

The clearest difference is price: API Zen at Free against iDraw OSC's $0.99. API Zen also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (13.0 vs 16.4). iDraw OSC's advantage is in-app purchases (none vs 3). On ads and device support there is nothing between them.

API Zen is free to download; iDraw OSC costs $0.99 up front. API Zen sells 3 one-off in-app purchases. iDraw OSC asks for nothing beyond the download.

iDraw OSC ships an update every 5 months, API Zen every 2 months. The most recent releases landed on September 19, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | iDraw OSC | API Zen |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Size | 2 MB | 7 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gwangyu Lee](https://appshunter.io/developer/1683904838) | [Jaseem Valiya Valappil](https://appshunter.io/developer/1714873997) |

## What reviewers say

### iDraw OSC

[App page](https://appshunter.io/ios/app/idraw-osc/id6461118802)

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

**In-app purchases:** none


### API Zen

[App page](https://appshunter.io/ios/app/api-zen/id6471152115)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thanks | $3.99 | one-time |
| Thank you | $5.99 | one-time |
| Thank you very much | $7.99 | one-time |


## Frequently asked questions

### Is iDraw OSC free?

iDraw OSC costs $0.99, with no in-app purchases.

### Is API Zen free?

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

### Do iDraw OSC or API Zen have ads?

Neither iDraw OSC nor API Zen shows ads.

### Which is updated more often, iDraw OSC or API Zen?

iDraw OSC ships an update every 5 months, and API Zen every 2 months. Most recently, iDraw OSC was updated on September 19, 2026 and API Zen on September 15, 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.*