# PMI View vs PQDIF Viewer

The clearest difference is update cadence: PQDIF Viewer at every 3 days against PMI View's every 2 months. PQDIF Viewer also leads on iOS requirement (15.6 vs 18.0). 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.

PMI View ships an update every 2 months, PQDIF Viewer every 3 days. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | PMI View | PQDIF Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/pmi-view/id6465390024/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 242 MB | 4 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Power Monitors, Incorporated](https://appshunter.io/developer/540822326) | [Russell Patterson](https://appshunter.io/developer/1723606459) |

## What reviewers say

### PMI View

[App page](https://appshunter.io/ios/app/pmi-view/id6465390024)

This application provides a platform for viewing and analyzing power quality data from field devices. It allows real-time inspection of waveforms, vector diagrams, harmonics, and meter readings. Recordings can be easily downloaded, inspected, and exported.

**Highlights:** Real-time waveform viewing, Vector diagram analysis, Harmonics inspection, Meter readings, Downloadable recordings, Exportable data

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### PQDIF Viewer

[App page](https://appshunter.io/ios/app/pqdif-viewer/id6769140607)

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

**In-app purchases:** none


## Frequently asked questions

### Is PMI View free?

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

### Is PQDIF Viewer free?

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

### Do PMI View or PQDIF Viewer have ads?

Neither PMI View nor PQDIF Viewer shows ads.

### Which is updated more often, PMI View or PQDIF Viewer?

PMI View ships an update every 2 months, and PQDIF Viewer every 3 days. Most recently, PMI View was updated on September 17, 2026 and PQDIF Viewer on September 21, 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.*