Dualmark

Dualmark

Markdown dual-version infrastructure for AI-readable marketing websites

Last Updated 11/3/2026

About Dualmark

Dualmark provides Markdown dual versions for website pages: browsers continue to receive the existing page, while AI agents get clean Markdown through the same URL. At the edge, the system identifies known clients through HTTP content negotiation, Accept headers, and User-Agent, without duplicate URLs, JavaScript, navigation, or cookie banners. It supports no-install scoring, CI checks in GitHub Actions, and blocking merges when the page consistency score falls below a threshold.

Best for

Marketing website teams
Website developers
Development teams responsible for GitHub Actions

Best use cases

AEO infrastructure for marketing websites

Page consistency checks before PR merges

Fast website page scoring before launch

Features

Markdown dual versions

Browsers access the published page, while AI agents get clean Markdown through the same URL.

Edge content negotiation

Selects the rendering for known clients using the Accept header and User-Agent.

Website scoring

Get a 0–125 score and itemized failures without installation or registration.

CI regression checks

Score each page in GitHub Actions and block merges below the threshold.

Pros

  • Different rendering for browsers and AI agents at the same URL
  • 30-second setup, with one-command CI verification
  • Apache 2.0 licensed with zero telemetry
  • Scoring without installation or registration

Cons

  • The Remix/React Router adapter is still on the roadmap

FAQ

It uses HTTP content negotiation: known clients are identified by the Accept request header, and User-Agent is used for common AI crawlers.
Add dualmark verify to GitHub Actions to score pages on every PR and block the merge when the consistency threshold is not met.

Tool Information

DeveloperDualmark
Release Date9/19/2026
PricingFree