🎬 Our macOS app “Heiter” is now live on the Mac App Store
With Heiter, you can bring classic anime videos into modern 4K quality, directly on your Mac, without cloud uploads and without detours. Whether it’s a favorite scene, a nostalgic episode, or a full rewatch: the native app is designed around a clear workflow:
📁 Select file → ⚙️ Adjust settings → ▶️ Start export
⚡ Fast, local, and tailored to the typical anime look.
What makes Heiter different? ✨
- ✅ 4K upscaling with Real-ESRGAN (2x or 4x)
- ✅ 4:3 → 16:9 with crop, blur fill, or stretch
- ✅ Native MKV support (input and output)
- ✅ Audio and subtitle tracks are preserved depending on the container
- ✅ Power Mode: Cool, Balanced, Max – to protect your CPU
- ✅ Hardware-accelerated with Apple Silicon, Neural Engine, and Metal
- ✅ Fully local on your Mac (no cloud upload)
Solution
The added value lies in the seamless overall process: modern upscaling quality, 4:3-to-16:9 options, and MKV track preservation in a single app. This eliminates the need to combine multiple individual tools, allowing you to re-experience classic anime episodes more easily, consistently, and reproducibly.
Main features (current)
- Input formats: MP4, MKV, MOV, M4V, AVI
- Output: MP4 (for MP4/MOV/M4V/AVI) or MKV (for MKV input)
- HEVC/H.265 export for modern target devices
- Freely selectable time range via start and end time
- Live progress in the dock icon
- Pause/resume during processing
- Localization in German, English, and Japanese
- Free on the Mac App Store
Performance & Quality ⚡
Heiter uses the Neural Engine on Apple Silicon and achieves up to approx. 17 fps in real local tests, depending on the material. The focus is on stable processing and a clean, natural image so that lines, colors, and motion appear consistent.
Privacy 🔒
Heiter works completely offline: no registration, no tracking, no ads, no transfer of your video data to servers. The app only accesses files that you actively select.
Technology behind it 🛠️
For upscaling quality, Heiter relies on Real-ESRGAN. Audio and subtitle tracks are preserved where container-compatible. This makes the workflow suitable for older anime releases with multiple audio tracks and subtitles.
The interface is intentionally kept minimal: import, options, start. No overloaded pro panel, but a clear workflow for everyday use. At the same time, Heiter offers enough control for more demanding sources via aspect modes, time range, and power profile.
Current status
As of April 21, 2026, Heiter is available as version 1.1 on the Mac App Store (latest update from April 20, 2026). The focus is on stable local processing and a fast, intuitive user experience.
Links
Product page: https://www.metaflash.de/en/heiter/
Mac App Store: https://apps.apple.com/us/app/heiter/id6760238611?mt=12
App insights
Conclusion
Heiter is a focused macOS app for anime upscaling: local, privacy-friendly, and technically tailored to older anime sources. If you want to re-experience classics in better quality on modern displays, this provides a direct and practical workflow.
Made by MetaFlash.
Made in Germany.