Letter Opener vs Folder Preview Pro
Side-by-side comparison for macOS
Letter Opener
8.0Display winmail.dat files directly in Mail.app
Folder Preview Pro
8.0Quick Look extension for folders
| Metric | Letter Opener | Folder Preview Pro |
|---|---|---|
| Category | Developer Tools | Utilities |
| AI Score | 8.0 | 8.0 |
| 30-day Installs | 5 | 128 |
| 90-day Installs | 21 | 251 |
| 365-day Installs | 76 | 625 |
| Version | 16.0.7 | 2.10 |
| Auto-updates | No | Yes |
| Deprecated | No | No |
| GitHub Stars | 3.8K | 1 |
| GitHub Forks | 241 | - |
| Open Issues | 5 | - |
| License | MIT | — |
| Language | Ruby | — |
| Last GitHub Commit | 1y ago | 3mo ago |
| First Seen | Nov 3, 2021 | Sep 22, 2025 |
Reviews
Letter Opener
Letter Opener is a macOS app that simplifies viewing winmail.dat files directly in Mail.app, a common issue for users dealing with Outlook-generated emails. It offers developers a tool to preview emails in the browser, enhancing workflow efficiency.
Displays winmail.dat files within Mail.app, allowing users to view rich text and embedded content without extra software.
Pros
- + Effectively handles winmail.dat files, a common issue
- + Actively maintained with a robust community following
- + Open-source MIT license, appealing to developers
Cons
- - Low recent installs indicate limited awareness or adoption
- - Manual updates required, no auto-update feature
Folder Preview Pro
Folder Preview Pro enhances macOS by enabling Quick Look previews for folders, displaying contents with actions and thumbnails. Ideal for users managing files frequently, it offers a seamless way to preview and interact with folders directly from Finder.
Enables Quick Look previews for folders, showing contents with actions and thumbnails.
Pros
- + Quick folder preview functionality
- + Actions and thumbnails for enhanced interaction
- + Auto-update feature for seamless updates
- + One-time purchase model with lifetime updates
Cons
- - Limited GitHub activity and transparency
- - Unknown license and development language