OpenTheo

Ever wished you could search across thousands of hours of sermons, lectures, and Christian podcasts for that one insight you half-remember? OpenTheo makes that possible — it's a free, open archive of AI-transcribed Christian audio and video content, fully searchable and growing every week.^1

Built using Whisper.cpp for speech recognition, OpenTheo has processed over 10,000 hours of content from well-known teachers and ministries. A featured collection of 1,000+ lectures by Steve Gregg includes verse-by-verse teaching through the entire Bible, alongside topical series on theology, discipleship, and Christian living.^2 Other featured voices include NT Wright, Dr. Mike Licona, Stand to Reason, Kevin DeYoung, The Veritas Forum, Dr. Martyn Lloyd-Jones, and John Stott.^3 Every transcript is interactive — click any word to jump straight to that moment in the audio, with real-time highlighting so you can follow along as it plays.^4

OpenTheo is an ecumenical ministry not affiliated with any denomination, with faith commitments summarized in the Apostles' Creed. Content publishers can have their podcasts, YouTube videos, or sermons transcribed and added to the index completely free of charge.^1

"One of the most amazing biblical studies resources I've ever seen. Transcripts coupled with audio and searchable and indexed with summaries of each lecture — what an amazing use of technology and time." — darinhouston, The Narrow Path Forum^5

"Thanks, that's really helpful. I learn better by reading than listening." — PR, The Narrow Path Forum^5

• Launched in March 2023 by developer Leif Foged, who shared the project in the Whisper.cpp open-source community^4
• Features a dedicated Steve Gregg collection with verse-by-verse teaching through every book of the Bible^2
• Content from prominent voices across Reformed, evangelical, and broadly orthodox traditions
• Entirely free with no ads, subscriptions, or paywalls
• Actively publishing new transcriptions as of March 2026, with regular updates on X (@OpenTheoProject)^3