# Winmail.dat Opener · Viewer vs DevIndex

The clearest difference is in-app purchases: DevIndex at none against Winmail.dat Opener · Viewer's 3. DevIndex also leads on iOS requirement (15.1 vs 17). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Winmail.dat Opener · Viewer sells 3 in-app purchases, starting at $1.99 per 7 days. DevIndex asks for nothing beyond the download.

Winmail.dat Opener · Viewer ships an update every 9 days, DevIndex weekly. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Winmail.dat Opener · Viewer | DevIndex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/winmaildat-opener-viewer/id6758431753/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | Paid | — |
| Size | 16 MB | 37 MB |
| Requires iOS | 17 | **15.1** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [延平 陈](https://appshunter.io/developer/1833168926) | [Dao Duong](https://appshunter.io/developer/1851400410) |

## What reviewers say

### Winmail.dat Opener · Viewer

[App page](https://appshunter.io/ios/app/winmaildat-opener-viewer/id6758431753)

Easily open and extract attachments from Winmail.dat, .msg, and .oft email files directly on your device. This utility offers a private, offline solution with a one-time purchase, ensuring your data never leaves your phone.

**Highlights:** Open winmail.dat (TNEF) files, Open Outlook .msg and .oft files, Extract attachments (photos, PDFs, Word, Excel), 100% on-device processing, One-time purchase, no subscriptions, Supports Dark Mode and Drag & Drop

**Features:** Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $1.99 | per 7 days |
| Premium Yearly | $12.99 | per year |
| Winmail Opener Pro | $19.99 | one-time |


### DevIndex

[App page](https://appshunter.io/ios/app/devindex/id6758738242)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Winmail.dat Opener · Viewer free?

Winmail.dat Opener · Viewer is free to download, with in-app purchases available.

### Is DevIndex free?

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

### Do Winmail.dat Opener · Viewer or DevIndex have ads?

Neither Winmail.dat Opener · Viewer nor DevIndex shows ads.

### Which is updated more often, Winmail.dat Opener · Viewer or DevIndex?

Winmail.dat Opener · Viewer ships an update every 9 days, and DevIndex weekly. Most recently, Winmail.dat Opener · Viewer was updated on October 24, 2026 and DevIndex on October 16, 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.*