# 16 Relay Controller vs Smart Dash

The clearest difference is in-app purchases: 16 Relay Controller at none against Smart Dash's 4. Smart Dash's advantage is update cadence (every 4 days vs every 34 months) and iOS requirement (16.4 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Smart Dash sells 4 in-app purchases, starting at $4.99 per month. 16 Relay Controller asks for nothing beyond the download.

16 Relay Controller ships an update every 34 months, Smart Dash every 4 days. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | 16 Relay Controller | Smart Dash |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 34 months | **Every 4 days** |
| Size | 0 MB | 71 MB |
| Requires iOS | 18.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mike Henry](https://appshunter.io/developer/1219782847) | [GROSNET TECHNOLOGY COMPANY LIMITED](https://appshunter.io/developer/1837882069) |

## What reviewers say

### 16 Relay Controller

[App page](https://appshunter.io/ios/app/16-relay-controller/id1541478119)

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

**In-app purchases:** none


### Smart Dash

[App page](https://appshunter.io/ios/app/smart-dash-iot-dashboards/id6752015373)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smart Dash Pro (Monthly) | $4.99 | per month |
| Buy me a coffee | $0.99 | one-time |
| Buy me a meal | $1.99 | one-time |
| Big supporter | $4.99 | one-time |


## Frequently asked questions

### Is 16 Relay Controller free?

16 Relay Controller is free to download, with no in-app purchases.

### Is Smart Dash free?

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

### Do 16 Relay Controller or Smart Dash have ads?

Neither 16 Relay Controller nor Smart Dash shows ads.

### Which is updated more often, 16 Relay Controller or Smart Dash?

16 Relay Controller ships an update every 34 months, and Smart Dash every 4 days. Most recently, 16 Relay Controller was updated on November 7, 2026 and Smart Dash on November 8, 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.*