# HighDeF — HDF Viewer

> HDF5 file viewer for Apple devices, displaying data as tables, plots, or images. (iPhone/iPad app by Twarge LLC.)

- Source: https://appshunter.io/ios/app/highdef/id6781456671 (this page in markdown: same URL + `.md`)
- Developer: [Twarge LLC](https://appshunter.io/developer/6781456673)
- Category: Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 26.0 · 5 MB
- Languages: American English
- Released: 2026-06-22
- Data updated: 2026-08-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/highdef/id6781456671/reviews.md

## What is HighDeF?

Views HDF5 files on Apple devices. Open an .h5 file and browse its groups and datasets in the sidebar, then read any dataset as a table, a plot, or an image — whichever suits the data. The app only reads the part of a dataset you are looking at, so even multi-gigabyte files open immediately and stay responsive. It is free and open source, and built on the HDF5 library.

## Key features

- HDF5 file viewing
- Group and dataset browsing
- Data visualization (table, plot, image)
- Instant loading of large files
- Responsive performance
- Open source


## Frequently asked questions about HighDeF

### What devices does HighDeF support?

HighDeF is available on Mac, iPhone, and iPad, allowing you to view HDF5 files across your Apple ecosystem.

### Is HighDeF free to use?

Yes, HighDeF is completely free to use. It is also open source, built on the HDF5 library.

### How does HighDeF handle large HDF5 files?

HighDeF efficiently loads only the necessary parts of a dataset, enabling instant opening and responsive interaction even with multi-gigabyte files.

### What kind of data can HighDeF display?

HighDeF can display HDF5 data as tables, plots, or images, adapting the visualization to suit the nature of the data within the datasets.

### How often is HighDeF updated?

The latest version, 1.1, was released on June 23, 2026, indicating recent development activity. The app was initially released on June 22, 2026.

### What is the age rating for HighDeF?

HighDeF has an age rating of 4+, making it suitable for a wide range of users.

### Does HighDeF have ads?

No, HighDeF does not contain advertisements. It is a free and open-source application.

### What are the main benefits of using HighDeF for data analysis?

HighDeF offers immediate access to HDF5 files, versatile data visualization options, and a smooth user experience, even with very large datasets.

## Version history (last 3 releases)

### 1.2 — 2026-07-30

- Better handling of graph pinch to zoom
- Support iPad OS multiple windows

### 1.1 — 2026-06-23

- Updated build tools (Swift 6)

### 1.0 — 2026-06-23

No release notes.

## More apps by Twarge LLC

- [DeXeF](https://appshunter.io/ios/app/dexef/id6781488401)
- [Stairstep](https://appshunter.io/ios/app/stairstep/id6781493653)
- [Typeset Typst](https://appshunter.io/ios/app/typeset-typst/id6781494180)
- [Geomagnetic Observatory](https://appshunter.io/ios/app/geomagnetic-observatory/id6783194320)

All apps by Twarge LLC: https://appshunter.io/developer/6781456673

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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 2026-08-05.*