Rust Developer Launches Rhema, Real-Time Sermon Transcription App

FOjebiyi pushed Rhema from idea to production in a week, and the result is not a demo. It is a Tauri v2 desktop app built with a React frontend and Rust backend that listens to live sermon audio, transcribes it in real time, detects Bible verse references, and pushes broadcast-ready overlays through NDI.

That speed matters because Rhema is aimed at a real church-production workflow. A preacher can quote Scripture directly, paraphrase it, or drift into a passage without naming it, and the app is built to catch all three. Its detection pipeline combines Deepgram speech-to-text with WebSocket streaming and REST fallback, direct reference parsing with Aho-Corasick and fuzzy matching, quotation matching against known verse text, and semantic search powered by Qwen3-0.6B ONNX embeddings and an HNSW vector index. The codebase also includes sermon context tracking and sentence buffering so it can keep up as a live message moves from verse to verse.

The project leans hard into local-first infrastructure. Rhema uses a SQLite Bible database with FTS5 full-text search, supports KJV, NIV, ESV, NASB, NKJV, NLT, AMP, and Spanish, French, and Portuguese translations, and pulls on more than 340,000 cross-references from openbible.info. It also leaves room for an optional cloud booster using OpenAI or Claude, but the core system is already designed to work as a desktop tool rather than a fragile web service.

Rust is the reason the stack feels practical instead of experimental. The repository describes itself as a Rust workspace with seven crates and requires Rust stable 1.77.2 or newer, a sign that the project was assembled with enough structure to move quickly without collapsing under its own parts. GitHub Pulse shows activity from April 4, 2026 through April 11, 2026, with five authors pushing 17 commits to main, and a public Discussions area opened on April 11, 2026 points to a project that is actively looking for contributors.

Rhema is also arriving in a small but busy corner of church tech. Pewbeam, a commercial AI-powered church presentation product, publicly launched on March 20, 2026 and says it automatically detects and displays Bible verses during sermons in real time while working offline. The idea sits on terrain that developer Dara Sobaloju described last year as a serious production problem, not a novelty: pastors misquote or paraphrase scripture, internet can be poor, power unreliable, and hardware capacity uneven. Rhema takes the same pain point and answers it with Rust, local embeddings, and a workflow built for the back of a sanctuary, not a lab bench.