# Sec MQTT Pub vs Sub

The clearest difference is update cadence: Sub at fortnightly against Sec MQTT Pub's every 28 months. 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.

Sec MQTT Pub ships an update every 28 months, Sub fortnightly. The most recent releases landed on September 8, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Sec MQTT Pub | Sub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sec-mqtt-pub/id1554992163/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 3 MB | 43 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Care Active Corp.](https://appshunter.io/developer/1739001802) | [PVR Controls](https://appshunter.io/developer/1637087825) |

## What reviewers say

### Sec MQTT Pub

[App page](https://appshunter.io/ios/app/sec-mqtt-pub/id1554992163)

This app provides a secure MQTT client for communicating with IoT devices using X.509 authentication and AES-128 encryption. It allows for customized messages and topics, offering a robust solution for secure IoT project communication.

**Highlights:** X.509 authentication, Root CA authentication support, AES-128 encryption, Face ID / Touch ID support, Customizable buttons for messages and topics, Open-source project

**In-app purchases:** none


### Sub

[App page](https://appshunter.io/ios/app/sub-connect/id6741066535)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sec MQTT Pub free?

Sec MQTT Pub is free to download, with no in-app purchases.

### Is Sub free?

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

### Do Sec MQTT Pub or Sub have ads?

Neither Sec MQTT Pub nor Sub shows ads.

### Which is updated more often, Sec MQTT Pub or Sub?

Sec MQTT Pub ships an update every 28 months, and Sub fortnightly. Most recently, Sec MQTT Pub was updated on September 8, 2026 and Sub on September 14, 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.*