# V16IoT vs CastLink

The clearest difference is update cadence: CastLink at every 4 days against V16IoT's every 3 weeks. V16IoT's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

V16IoT ships an update every 3 weeks, CastLink every 4 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | V16IoT | CastLink |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 43 MB | 2 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [胜火 冯](https://appshunter.io/developer/1808362218) | [Shenzhen GaoshiGo Technology Co., Ltd.](https://appshunter.io/developer/1637771081) |

## What reviewers say

### V16IoT

[App page](https://appshunter.io/ios/app/v16iot-sos/id6749419777)

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

**In-app purchases:** none


### CastLink

[App page](https://appshunter.io/ios/app/castlink/id6761456751)

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

**In-app purchases:** none


## Frequently asked questions

### Is V16IoT free?

V16IoT is free to download, with no in-app purchases.

### Is CastLink free?

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

### Do V16IoT or CastLink have ads?

Neither V16IoT nor CastLink shows ads.

### Which is updated more often, V16IoT or CastLink?

V16IoT ships an update every 3 weeks, and CastLink every 4 days. Most recently, V16IoT was updated on October 30, 2026 and CastLink on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*