Ever searched the Bible for a concept you couldn't quite put into words? Biblos uses semantic search to help you find passages by meaning, not just keywords — so a search like "how to deal with anxiety" surfaces relevant verses even if the word "anxious" never appears.^1
In October 2025, creator Jon Boldt rebuilt Biblos from the ground up to run entirely in your browser using Transformers.js and BGE-large-en-v1.5 embeddings. The app now pre-computes 1024-dimensional vectors for all 31,000 Bible verses offline, compresses them into ZIP files by book, and performs cosine similarity search directly on your device — no data is sent to any server. The previous server-hosted version cost $20/month; the new one runs free on Vercel.^2
Biblos also pairs semantic search with a hybrid reference loader: type "John 3:16" or "Psalm 23" and it instantly loads the text. For New Testament passages, it displays Greek text alongside definitions from the Dodson Greek Lexicon. Church Fathers' commentaries from 15+ historical sources (Augustine, Chrysostom, and others) provide theological context on the passages you're studying.^3
A companion daily reading plan is available at bibleread.app, covering the entire Bible in 260 readings across 52 weeks with built-in ESV audio narration and Church Fathers commentary.^4
Why Christians Love It"Playing with this a bit more, and it is very cool! One thing I like is that it provides the source text, so you can verify whether the summary is accurate." — Hacker News user^5
"Bible study just got more lit." — Hacker News user^5
"Impressive. It actually gave useful results and summary for annihilationism." — Hacker News user^5
Notable- Open source on GitHub (CC BY-NC 4.0) with 230 stars and community contributions^3
- Rebuilt in 2025 to run 100% client-side with Transformers.js — zero server costs, zero data leaving your browser^2
- Featured on Hacker News "Show HN" with 136 points and 84 comments^5
- Created by developer Jon Boldt as a free, no-ads, no-tracking Bible study tool^4
- Also accessible at bibleread.app with a daily reading plan and ESV audio^4
- Uses BGE-large-en-v1.5 embeddings for vector search with a modular architecture^3
