# RegionMirror

> RegionMirror is a macOS application that solves ultrawide screen sharing problems. It lets users share specific regions of their monitor at any resolution, with built-in annotation, whiteboard, and privacy tools that work across all collaboration platforms.

## Product Facts

- Name: RegionMirror
- Category: Screen Sharing / Productivity / Remote Collaboration
- Platform: macOS 13.0 or later
- Price: $19.99 (one-time purchase, 7-day free trial)
- Distribution: Mac App Store
- App Store URL: https://apps.apple.com/app/regionmirror/id6753604977
- Website: https://regionmirror.com
- Support: support@regionmirror.com
- Latest Version: 1.1

## Problem Solved

When users share an entire ultrawide monitor (e.g. 49-inch 5120x1440) in video calls, content appears too small for viewers on standard displays. Users constantly hear "can you zoom in?" and must stop/restart sharing to switch between windows. RegionMirror eliminates both problems.

## Core Features

### Precise Region Selection
Draw a custom rectangular area on any monitor. Resize and reposition the shared region during active sharing without interrupting the session.

### Multi-Display Support
Choose which connected display to share from. Works with any number of monitors.

### Default Region Memory
Save a preferred region per-monitor. On subsequent sessions, the saved region is automatically restored—no region selector needed.

### Global Keyboard Shortcuts
Start sharing instantly from any application with per-monitor hotkeys (default: ⌃⌥⇧+1, ⌃⌥⇧+2, etc.). Customizable in Settings. No Accessibility permission required.

### Presenter View
A scaled-down preview of the shared region, positioned for the presenter's reference while the main mirror window stays off-screen.

### Privacy Protection (Blur)
Instantly blur the shared screen when entering sensitive information. One-click toggle.

### Smart Annotations
Arrow and text annotations that are moveable, resizable, and visible to viewers. Works consistently across all platforms.

### Integrated Whiteboard
Full drawing tools: shapes, lines, freeform, and text. All elements are editable after creation.

## How It Works

1. Choose "Share Region" from the menu bar, dock, or press the global keyboard shortcut
2. Draw a region on the selected monitor (or use a saved default)
3. Position application windows within the shared region
4. In your collaboration tool (Teams, Zoom, Slack, Discord, Google Meet), share the RegionMirror window (green-framed, titled "Share this window!")

## Compatibility

Works with any collaboration tool that supports window sharing:
- Microsoft Teams
- Zoom
- Slack
- Discord
- Google Meet
- Webex
- Any other tool with "Share Window" functionality

## Comparison to Alternatives

| Approach | Limitation | RegionMirror Advantage |
|----------|-----------|----------------------|
| Share entire screen | Too small on ultrawide for viewers | Share only the relevant portion at optimal resolution |
| Share individual window | Must stop/restart when switching apps | Drag windows in/out of shared region seamlessly |
| Change resolution before sharing | Requires prep time, reorganizes windows | No resolution change needed, instant setup |
| OBS virtual camera | Complex setup, resource-heavy | Lightweight, purpose-built, no configuration |

## Technical Details

- Uses macOS ScreenCaptureKit for efficient capture
- Requires Screen Recording permission only
- No Accessibility permission needed (uses Carbon RegisterEventHotKey for global shortcuts)
- App Store sandboxed
- Minimal resource usage

## Links

- Homepage: https://regionmirror.com
- Privacy Policy: https://regionmirror.com/privacy-policy.html
- Blog: https://regionmirror.com/blog.html
- Download: https://apps.apple.com/app/regionmirror/id6753604977