# PQDIF Viewer — Power Quality Data Viewer

> Power Quality Data Viewer (iPhone/iPad app by Russell Patterson.)

- Source: https://appshunter.io/ios/app/pqdif-viewer/id6769140607 (this page in markdown: same URL + `.md`)
- Developer: [Russell Patterson](https://appshunter.io/developer/1723606459)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 15.6 · 4 MB
- Languages: American English
- Released: 2026-05-15
- Data updated: 2026-06-04
- User reviews in markdown: https://appshunter.io/ios/app/pqdif-viewer/id6769140607/reviews.md

## What is PQDIF Viewer?

PQDIF Viewer is a simple to use tool to chart Power Quality data in PQD files (IEEE 1159.3-2025). Open files from Mail, Files, or AirDrop, or tap the bundled sample to try it out.

Built for power system engineers who need to inspect data on the go.


## Version history (last 2 releases)

### 1.0.2 — 2026-05-18

Squashed a bug and added amplitude zoom on Waveform plots.

### 1.0 — 2026-05-15

No release notes.

## More apps by Russell Patterson

- [PSRC Agenda](https://appshunter.io/ios/app/psrc-agenda/id1376841558)
- [JTCM Agenda](https://appshunter.io/ios/app/jtcm-agenda/id1439235885)
- [Comtrade Viewer](https://appshunter.io/ios/app/comtrade-viewer/id1469713323)

All apps by Russell Patterson: https://appshunter.io/developer/1723606459

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*