# iPIMM SMS vs PDI/Envoy HHT

The clearest difference is device support: PDI/Envoy HHT at 3 against iPIMM SMS's 1. iPIMM SMS's advantage is iOS requirement (11.0 vs 14.2). On price, update cadence, ads and in-app purchases there is nothing between them.

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

iPIMM SMS ships an update every 6 weeks, PDI/Envoy HHT every 2 months. The most recent releases landed on September 28, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | iPIMM SMS | PDI/Envoy HHT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ipimm-sms/id976835287/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 126 MB | 175 MB |
| Requires iOS | **11.0** | 14.2 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Procuro, Inc.](https://appshunter.io/developer/304494257) | [PDI Technologies, Inc.](https://appshunter.io/developer/1398042775) |

## What reviewers say

### iPIMM SMS

[App page](https://appshunter.io/ios/app/ipimm-sms/id976835287)

This system offers a comprehensive quality management solution for restaurants, convenience stores, and grocery retailers. It streamlines operations by managing temperature, energy, security, and cash, providing a centralized platform for food safety inspections and audits.

**Highlights:** Temperature and energy management, Security and cash management, Drive-thru performance tracking, Centralized refrigeration unit management, Quality grading and reporting, Food safety and HACCP inspections, Audit simplification and scoring

**In-app purchases:** none


### PDI/Envoy HHT

[App page](https://appshunter.io/ios/app/pdienvoy-hht/id1495710167)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iPIMM SMS free?

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

### Is PDI/Envoy HHT free?

PDI/Envoy HHT is free to download, with no in-app purchases.

### Do iPIMM SMS or PDI/Envoy HHT have ads?

Neither iPIMM SMS nor PDI/Envoy HHT shows ads.

### Which is updated more often, iPIMM SMS or PDI/Envoy HHT?

iPIMM SMS ships an update every 6 weeks, and PDI/Envoy HHT every 2 months. Most recently, iPIMM SMS was updated on September 28, 2026 and PDI/Envoy HHT on October 9, 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.*