Learning Waypoints · prototype

Audio

Paste an expert / learner script and generate. It's voiced entirely in the browser with Kokoro — no server, no API key. First run downloads the model (~300 MB) once, then caches it.

Expert voice Learner voice Try WebGPU (faster, Chrome/Edge)

Script (JSON)

[
  {
    "speaker": "expert",
    "text": "Today we're looking at why objects float or sink. Quick check. What makes something float, do you think?"
  },
  {
    "speaker": "learner",
    "text": "I think heavy things sink and light things float. So a heavy object always goes down."
  },
  {
    "speaker": "expert",
    "text": "That's the common idea, but it's the trap here. A huge steel ship is incredibly heavy, yet it floats. So weight alone can't be the answer."
  },
  {
    "speaker": "learner",
    "text": "Oh. So if it's not just weight, what actually decides it?"
  },
  {
    "speaker": "expert",
    "text": "It comes down to density, which is the mass packed into a given space. If an object is less dense than water it floats. The ship is mostly air inside, so overall it is less dense than water, even though it is heavy."
  },
  {
    "speaker": "learner",
    "text": "So the steel itself sinks, but the ship shape full of air doesn't. That's the bit that matters."
  },
  {
    "speaker": "expert",
    "text": "Exactly. Hold onto this. Float versus sink is about density compared to the fluid, not weight on its own. Everything this week builds on that."
  }
]