Sometimes you just need to validate how an icon looks on crappy external monitors, and desktop mirroring will mess your flow all the way up.
doPreview was built for that exact case: preview one image across selected displays on iOS and macOS without messing up your screen spanning setup. It is also localized in over 11 languages.

Current focus:
- Select built-in, external, or all displays.
- Keep zoom and pan synchronized across outputs.
- Use controlled background color while evaluating image contrast.
- Localized in over 11 languages.
Launch details and download links are posted on the doPreview page.