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

# Heretic: Physics-Based Browser Intelligence Platform

> Heretic returns a verdict on every browser session by measuring physics the client cannot fake — RTT floors, kernel TCP options, and hardware under load.

Heretic is a browser intelligence service built on a principle no adversary can defeat: the speed of light. Every claim a browser makes about itself — its timezone, its operating system, its hardware — can be forged. But the round-trip time from Warsaw to Tokyo cannot be faked down to 2 milliseconds. Heretic measures what the physics allows, compares it to what the browser claims, and returns a **verdict** with the evidence attached.

<CardGroup cols={2}>
  <Card title="Quick Start" icon="rocket" href="/quickstart">
    Install the collector and read your first verdict in under five minutes.
  </Card>

  <Card title="How It Works" icon="atom" href="/how-it-works">
    Understand the physics, evidence families, and ruling algebra behind every verdict.
  </Card>

  <Card title="API Reference" icon="code" href="/api/explain-endpoint">
    Full reference for the explain endpoint and verdict JSON schema.
  </Card>

  <Card title="Pricing" icon="tag" href="/reference/pricing">
    The full signal catalogue is free during early access on the apostate tier.
  </Card>
</CardGroup>

## Why verdicts, not scores

Most bot-detection and fraud-prevention tools return a probability score. You pick a threshold, accept the false positives, and live with the ambiguity. Heretic takes a different position: where the physics is binary, the verdict should be binary too.

When a session claims Tokyo and completes a TCP handshake in 2 milliseconds from Warsaw — a journey that light alone needs 27 milliseconds to make — no benign explanation exists. The verdict is `contradicted`, `conclusive: true`, and the evidence is right there in the JSON response. You block or challenge. You do not tune a threshold.

When Heretic does not have enough evidence to reach a verdict, it says `insufficient`. It does not guess.

## The six evidence families

Heretic runs six independent measurement families on every session. A verdict requires corroboration across families — a single compromised signal cannot flip a ruling on its own.

<CardGroup cols={3}>
  <Card title="Network Geometry" icon="globe" href="/concepts/evidence-families">
    RTT measured against the speed-of-light floor for the claimed location.
  </Card>

  <Card title="Transport Stack" icon="network-wired" href="/concepts/evidence-families">
    Kernel TCP options and QUIC reachability reveal the true OS.
  </Card>

  <Card title="TLS Construction" icon="lock" href="/concepts/evidence-families">
    ClientHello structure and cipher ordering fingerprint the real client.
  </Card>

  <Card title="Compute" icon="microchip" href="/concepts/evidence-families">
    CPU model corpus and core performance measured under load.
  </Card>

  <Card title="Render" icon="display" href="/concepts/evidence-families">
    GPU, canvas, audio, and frame timing under real workload.
  </Card>

  <Card title="Declared" icon="browser" href="/concepts/evidence-families">
    Browser-supplied values read only as claims to check, never as facts.
  </Card>
</CardGroup>

## Get access

Heretic is in early access. The **apostate** tier is free and includes the full signal catalogue, the explain endpoint, and the live Warsaw bare-metal edge.

<Note>
  Request access at [heretic.quest](https://heretic.quest/#access). Once approved, sign in to the dashboard to create a site and get your API key.
</Note>


## Related topics

- [How Heretic Measures Browser Integrity with Physics](/how-it-works.md)
- [Heretic FAQ: Integration, Verdicts, Privacy, and Access](/reference/faq.md)
- [Heretic Privacy: Data Collection, Retention, and Deletion](/reference/privacy.md)
- [Evidence Families: Six Independent Measurement Domains](/concepts/evidence-families.md)
- [Heretic Verdict Schema: Complete JSON Field Reference](/api/verdict-schema.md)