> ## Documentation Index
> Fetch the complete documentation index at: https://www.mellowtel.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> The four ideas behind Mellowtel you should understand before integrating

Mellowtel is built on four principles. Read these once and you will understand every behavior, default, and API choice in the rest of the docs.

<CardGroup cols={2}>
  <Card title="Opt-in / Opt-out" icon="signature" href="/concepts/opt-in-out">
    Users must give explicit consent before any bandwidth is shared, and can revoke it at any time.
  </Card>

  <Card title="Privacy" icon="lock" href="/concepts/privacy">
    Requests run in a sandboxed, credential-less environment. No cookies, storage, or personal data ever leave the device.
  </Card>

  <Card title="Rate Limiting" icon="stopwatch" href="/concepts/rate-limiting">
    The SDK throttles itself automatically so a user's browsing experience is never affected.
  </Card>

  <Card title="Open Source" icon="github" href="https://github.com/mellowtel-inc/">
    Every line is on GitHub. If a doc is unclear, the source is the ground truth.
  </Card>
</CardGroup>