Lectorium
LiveListen to the wisdom of the sages
A library of spiritual lectures with AI-assisted search, smart collections, and a reverent reading experience — on iOS, Android, and the web.
iOS · Android · Web
Lectorium is a quiet place to listen. It gathers thousands of spiritual lectures into a single app — searchable, beautifully readable, and built to be returned to again and again. Deep ideas in plain words: the soul, consciousness, karma, and the meaning of life, for your commute, a walk, or at home.
Every answer the in-app assistant gives is grounded in the lecture corpus and cites the exact passage — verse, purport and timestamp — so you can hear the source right away, never an invented one.
Lectorium is free on the App Store and Google Play, with a full web library at listentosadhu.app.
A look inside
Track your progress
A day streak, and pick up right where you left off.
Search & filters
Find lectures by topic, author and date.
Ask Sadhu
A clear answer with links to the specific lectures.
Memories of Prabhupāda
The assistant finds and plays disciples’ remembrance videos.
Text beside the audio
Read and listen at once — the current passage in view.
Bookmark what matters
Save transcript snippets and jump back to the exact second.
Every lecture in detail
Description, chapter outline and topics — all on one screen.
Thousands of lectures
On the Gita, the Bhagavatam and other scriptures — always at hand.
Everything to study the scriptures every day
Listen, read, and return to what matters.
A large library of lectures
Thousands of lectures on the Bhagavad-gita, Srimad-Bhagavatam and other Vedic scriptures. A full-text catalog with filters by author, place, source, tag and language — always at hand.
Text alongside the audio
The transcript runs with the audio and highlights the current sentence as the lecture plays. Tap a line to jump there, or select text to copy and share.
Bookmark what matters
Select a passage right in the transcript and save a bookmark. Notes are searchable and shareable, and tapping one takes you back to the exact second of the recording.
Search by topic
Find lectures by title, source, author or date. Full-text search and precise filters get you to the topic or passage of scripture in seconds.
Listen offline
Download lectures together with their transcript and listen offline — on the road, in flight, or wherever there is no signal. The catalog and texts work without a connection too.
Ask Sadhu
Ask about the soul, karma or the meaning of life. The assistant answers from the lecture corpus and cites exact passages — verses, purports and timestamps — so you can hear the source right away.
Share a moment
Turn any passage into an audio clip, a short video or a transcript quote and send it to friends — with a link back to the lecture itself.
Build a listening habit
An “up next” queue is always ready for the next lecture, while an activity heatmap and a day-streak counter show your practice growing.
From the journal
Writing about Lectorium
Answers that cite their sources
Building a conversational guide that never invents — how we store the corpus, what we throw out before the model ever sees it, the cheap cosine gate that decides "do we even know this?", and why "I don't know" is a measured number, not a mood.
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Denoising without scrubbing the voice
Decades-old lectures arrive with tape hiss, hum, and static. The hard part is not removing the noise — it is removing the noise without eating the voice, gating pauses to dead silence, or inventing sound that was never there.
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One chat, every language
The corpus is mostly English; users arrive in Russian, Ukrainian, Serbian. Instead of pre-translating everything, the chat has a translation layer that translates quotes and fragments as it answers — and stores each translation once, beside its original, so it stays fast and the source is always one tap away.
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Where the thirty seconds went
Our assistant answered in 30–40 seconds. The culprit was not the language model at all — and the fixes were four old ideas: measure first, filter early, wait in parallel, and only work hard on the hard questions.
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Stories you can watch
Ask about a moment from Śrīla Prabhupāda's life and the answer is no longer only text — short video clips come back, disciples telling how it was.
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A library that tends itself
Over 5,400 lectures gathered into one place — with a smart library that downloads what is next, clears out what you have heard, and always keeps something ready offline.
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Ready to see Lectorium for yourself?
A library of spiritual lectures with AI-assisted search, smart collections, and a reverent reading experience — on iOS, Android, and the web.
Open listentosadhu.app