01 / What makes it useful
A helping ear at the media desk
A Bible reference does not have to be spoken perfectly in one sentence. LumosCast uses the surrounding speech to help recognise book names, chapters and verses.
Church services · Live presentation · Offline-first
LumosCast
Keep up with the message.
Keep the room engaged.
LumosCast helps a church media team put the right Bible passage on screen as a speaker mentions it. It listens, finds the passage and prepares it for the operator, so there is less searching during a live service.
- For
- Church media teams
- Role
- Architecture and full build
- Availability
- macOS & Windows downloads
What it makes possible.
02 / What makes it useful
The operator keeps the final say
Suggested passages can be checked before they reach the screen. The listening assistant supports the person running the service while leaving them in control of what goes live.
03 / What makes it useful
Scripture even when the internet drops
Speech recognition and bundled Bible texts run on the computer. Core scripture presentation can continue without depending on an internet connection.
The everyday essentials.
Give the person at the media desk a clearer path from what is being said to what the congregation sees.
Listen as the speaker talks
Live listening picks up spoken Bible references and brings possible passages into the operator’s workflow.
Find a passage quickly
Search for scripture manually when needed, with bundled Bible translations available without an internet connection.
Preview before going live
Check a passage and prepare the next one before showing it to the room.
Serve the room and the livestream
Send the presentation to projectors and to OBS, the software used to produce a livestream.
Prepare the next moment
Queue passages so the operator can stay ready as the service moves forward.
Start from a desktop app
A desktop launcher starts the presentation system and helps the operator choose the microphone.
For the curiousBehind the buildExplore the architecture and tools.
Architecture
One process, from microphone to screen.
Hover or tap a component to trace its connections.
Desktop launcher
Starts and supervises the server, tray, microphone picker
- Avalonia
- Web host · starts, restarts
Web host
Pipeline, minimal API and the event broadcaster
- ASP.NET Core
- SSE
- Operator console · SSE + REST
- Display pages · SSE /events
Operator console
Search, preview, confirm and queue passages
- React
- Vite
Audio capture
Microphone input cut into speech at pauses
- PortAudio
- VAD
- Speech engine · speech chunks
Speech engine
Local transcription, biased to scripture vocabulary
- Whisper.net
- sherpa-onnx
- Reference parser · transcripts
Reference parser
Finds references across utterances and scores confidence
- Core
- No dependencies
- Scripture store · verse lookup
- Web host · detected verses
Display pages
One styled page per projector or OBS output
- React
Scripture store
Bundled KJV, ASV and BSB for offline use
- SQLite
- Dapper
- api.bible · online translations
api.bible
Optional NIV, AMP and MSG, cached for 14 days
- HTTP
- Local cache
All connections
- Desktop launcher to Web host: starts, restarts
- Audio capture to Speech engine: speech chunks
- Speech engine to Reference parser: transcripts
- Reference parser to Scripture store: verse lookup
- Scripture store to api.bible: online translations
- Reference parser to Web host: detected verses
- Web host to Operator console: SSE + REST
- Web host to Display pages: SSE /events
Technology stack
What it is built with.
Host
- .NET 10
- ASP.NET Core Minimal API
- Server-Sent Events
Speech and audio
- Whisper.net
- sherpa-onnx
- PortAudio
Data
- SQLite
- Dapper
- api.bible
Interface
- React
- Vite
- Avalonia
Quality
- xUnit
- Golden-audio tests
Next project