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Live Captions Rain

Live Captions Rain is a Windows WPF app that turns Windows Live Captions into a physics-based word overlay. Caption words fall over the selected monitor, pile up on the screen floor, and can optionally stack on visible desktop window tops.

Screenshots

Settings

Features

• Reads words from Windows Live Captions.
• Drops caption words into a transparent desktop overlay.
• Supports selected-monitor mode and all-monitor mode.
• Keeps the overlay click-through by default, with optional click interaction.
• Uses Box2D physics for gravity, stacking, wind, and window-top platforms.
• Detects visible desktop windows and uses only visible top edges for stacking.
• Splits words after high fall impacts.
• Supports Hangul-aware word fragmentation.
• Provides font family, size, weight, fill, outline, color, opacity, and shadow controls.
• Provides random, left-to-right, right-to-left, and center-biased spawn modes.
• Applies natural random wind with horizontal movement and light upward lift.
• Minimizes to tray on close.
• Supports Korean and English UI based on Windows display language.

Requirements

• Windows 11
• Windows Live Captions
• .NET 8 SDK for development builds

Quick Start

1. Enable Windows Live Captions, or let Live Captions Rain launch it.
2. Launch LiveCaptionsRain.exe.
3. Select the target monitor.
4. Adjust text style and physics options.
5. Press Turn On.
6. Close the settings window to keep the app running in the tray.

Settings are stored at:

%APPDATA%\LiveCaptionsRain\settings.json

Build

dotnet restore
dotnet build LiveCaptionsRain.sln
dotnet test LiveCaptionsRain.sln
dotnet publish src\LiveCaptionsRain\LiveCaptionsRain.csproj -c Release -r win-x64 --self-contained false /p:PublishSingleFile=true /p:IncludeNativeLibrariesForSelfExtract=true

Generated artifacts, bin, and obj outputs should not be committed.

Repository Layout

• src\LiveCaptionsRain - WPF app, settings window, tray integration, overlay, Live Captions adapter, Win32 interop, and rendering controls.
• src\LiveCaptionsRain.Core - caption processing, settings, localization, physics helpers, wind, window-platform resolution, and word fracture logic.
• tests\LiveCaptionsRain.Tests - unit tests for captions, settings, localization, physics, window filtering, wind, spawning, and text fracture.
• docs - project documentation and screenshots.
• artifacts - local generated builds and verification screenshots. This directory is ignored by git.

Privacy

Live Captions Rain does not record audio and does not send caption text to a remote service. The app reads the text already displayed by Windows Live Captions. Settings are stored locally under %APPDATA%\LiveCaptionsRain.

Known Limitations

• Windows Live Captions UI changes can require adapter updates.
• Text collision uses rectangular physics bodies for stability.
• Some shell, game, protected, or GPU-overlay windows may not expose usable geometry.
• Fullscreen or top-edge-attached windows are treated as occluders, not word platforms.
• Windows 11 is the supported target.

Credits

• SakiRinn/LiveCaptions-Translator
• Me-in-U/LiveDialogue-Translator
• Box2D.NET
• Interop.UIAutomationClient
• WPF-UI

License

Apache-2.0. See LICENSE.