Formulas and units
“F = q(E + v × B)” or “9.81 m/s²” read symbol by symbol is unusable. Read properly, it is a sentence.
Engineering · physics · maths
Your textbook, read aloud the way a lecturer would.
Engineering books are dense with formulas, units and diagrams. Aethel reads the formulas in words, says units properly and describes the diagram the paragraph relies on, so a chapter makes sense by ear.
Five books and an hour of narration free. No card needed.
The problem
Diagrams carry the explanation
Free-body diagrams, circuits and plots are referenced constantly. Audio has to say what they show.
Second passes take time
Hard chapters need more than one pass. Listening makes the second pass possible on a walk.
How Aethel helps
Physics and maths notation
Gradients, divergence, curl, integrals with limits, vectors and Greek letters are spoken in plain English.
Units read in words
Common units such as metres per second squared, hertz and degrees Celsius are spoken properly.
Diagram descriptions
Figures are kept next to their paragraph with a spoken description of what they show.
Worked examples on demand
Ask for a numeric example of the formula on screen and hear it worked through.
What you will hear
These are produced live by the same speech engine the app uses. Press Listen to hear them in your device's voice; in the app you choose a studio or ElevenLabs voice.
F = q(E + v × B)
Aethel says
F equals q times the quantity E plus v cross B
∇ · E = ρ / ε₀
Aethel says
the divergence of E equals rho over epsilon naught
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 4ac, over 2a
Get started in three steps
- 1Create a free account.
- 2Upload the EPUB or a text-based PDF of your textbook.
- 3Start with the chapter you are studying now, at 1× speed for the first pass.
Questions
My textbook is on Kindle or Apple Books. Can I import it?
Books bought from Amazon or Apple are copy-protected by the store and cannot be imported by any app. A DRM-free EPUB or PDF from your publisher or library works.
How long does a chapter take to narrate?
Narration is generated as you listen and is cached, so starting a chapter takes a few seconds and replaying it is instant.
Hear your own book this way.
Free to start: five books and an hour of narration, no card needed.