Keep the structure
Chapters stay in order. Equations, figures and tables remain attached to their surrounding explanation.
For textbooks and research papers
Audio that doesn't skip the equations.
Listen to the textbook or paper you need to study. Aethel reads equations as maths, describes figures and tables where they appear, highlights every sentence as it is read, and answers your questions on the spot.
- Keep equations, diagrams and explanations together
- Ask, translate and make review cards as you read
- Start with EPUB, text-based PDF or plain text
A free account includes five books and one hour of standard narration. Paid plans include a 7-day trial of the plan you choose; cancel before it ends to avoid the subscription charge. Scanned PDFs are read with text recognition; text-based files give the best results. See what works and what it costs.
From dense page to lasting understanding
One idea · explained, heard, remembered
Same passage · English → Spanish
English
Attention compares each query with the keys. The resulting weights decide how much each value contributes to the output.
Spanish
La atención compara cada consulta con todas las claves. Los pesos resultantes determinan cuánto aporta cada valor a la salida.
The printed equation
Attention(Q, K, V) = softmax(QKᵀ / √dₖ)V
ElevenLabs voice · George
A short George narration, produced with ElevenLabs.
For the reading that takes more than one pass
Follow every sentence
Listen at your pace while the current passage is highlighted. Tap another line to pick up there.
Read across languages
Translate a chapter when you need it, then switch back to the original text at any time.
Work through hard ideas
Ask for an explanation, a rephrasing or a worked example right where the question comes up.
Hear the difference
Equations read as maths, not as symbols.
This is exactly what the narrator says for each formula. Try your own, no account needed.
Printed
Attention(Q, K, V) = softmax(QKᵀ / √dₖ)V
Aethel says
Attention of Q, K, V equals softmax of the quantity Q K transpose over the square root of d sub k, times V
Printed
x = (−b ± √(b² − 4ac)) / 2a
Aethel says
x equals the quantity negative b plus or minus the square root of the quantity b squared minus 4 a c, over 2a
Printed
P(A|B) = P(B|A) P(A) / P(B)
Aethel says
P of A given B equals P of B given A, times P of A, over P of B
A considered investment in your learning
Know what you get before you begin.
Every paid plan starts with seven days free. Nothing is charged until the trial ends; cancel any time. Choose your plan after creating an account.
Pro Reader
Everyday reading, fully unlocked.
$4.99/ month
- 6 hours of narration each month
- Natural standard studio voices
- Unlimited book imports
- Unlimited translations and explanations
Pro
Technical books, narrated clearly.
$9.99/ month
- 12 hours of narration each month
- ElevenLabs premium voice library
- Everything in Pro Reader
- Explain, Example and Ask, read aloud
Executive
About 6 hours of listening a week.
$29.99/ month
- 25 hours of narration each month
- ElevenLabs premium voice library
- Everything in Pro
- Executive dossiers: thesis, models, takeaways
Pro Reader starts at $4.99/month. ElevenLabs premium voices are included with Pro ($9.99/month) and Executive ($29.99/month). Pay yearly and get about two months free.
Why Pro costs more
Two kinds of voice, priced honestly.
Pro Reader uses clear standard studio voices: 6 hours a month for $4.99. Pro and Executive add ElevenLabs voices, which cost several times more per hour to generate. Equations, figures and tables are handled the same way on every plan.
Compare plans in detailYour own reading library
Start with the book on your desk.
Bring an EPUB, a text-based PDF or a plain-text file. Aethel Audio keeps your library private to your account; protected Kindle and Apple Books files cannot be imported.