diff --git a/hype/hdrinfo.html b/hype/hdrinfo.html
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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>hdrinfo: HDR Truth Before You Tune Pixels</title>
+  <style>
+    :root { --bg: #11131b; --card: #1a2130; --line: #314057; --ink: #eef4ff; --muted: #a8b6cc; --hot: #9df0ff; --warm: #ffd37a; }
+    * { box-sizing: border-box; }
+    body {
+      margin: 0;
+      color: var(--ink);
+      font: 16px/1.55 "Segoe UI", Arial, sans-serif;
+      background:
+        radial-gradient(900px 420px at 10% -10%, #20395a 0%, transparent 62%),
+        radial-gradient(800px 420px at 100% 0%, #49305a 0%, transparent 58%),
+        linear-gradient(180deg, #151b28, var(--bg));
+      min-height: 100vh;
+    }
+    main { max-width: 980px; margin: 0 auto; padding: 30px 18px 46px; }
+    section, .hero { border: 1px solid var(--line); border-radius: 14px; background: linear-gradient(180deg, #1b2434, #151d2a); padding: 18px; margin-top: 14px; }
+    .hero { margin-top: 0; padding: 24px; }
+    .eyebrow { color: var(--hot); text-transform: uppercase; letter-spacing: .12em; font-size: 12px; }
+    h1, h2 { margin: 0 0 8px; font-family: Cambria, Georgia, serif; }
+    h1 { font-size: clamp(30px, 4vw, 44px); line-height: 1.1; }
+    h2 { color: var(--warm); }
+    p { margin: 0 0 10px; color: var(--muted); }
+    ul { margin: 8px 0 0 20px; color: var(--muted); }
+    code { background: #101722; border: 1px solid #30415b; border-radius: 5px; padding: .1em .35em; color: #d8edff; }
+    pre { margin: 10px 0 0; background: #0d131d; border: 1px solid #30415b; border-radius: 10px; padding: 12px; overflow: auto; color: #d8edff; font: 13px/1.45 Consolas, "Cascadia Mono", monospace; }
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+    .pill strong { color: var(--ink); }
+  </style>
+</head>
+<body>
+  <main>
+    <header class="hero">
+      <div class="eyebrow">Hype Post</div>
+      <h1>hdrinfo gives HDR work a real display baseline</h1>
+      <p>
+        Before you tune a swap chain, tone mapper, or bug report around "HDR looks wrong", capture what Windows and DXGI actually know about the active outputs.
+        <code>hdrinfo</code> condenses that state into one shareable CLI report.
+      </p>
+      <div class="grid">
+        <div class="pill"><strong>Tool:</strong> hdrinfo</div>
+        <div class="pill"><strong>Date:</strong> July 03, 2026</div>
+        <div class="pill"><strong>Sources:</strong> DisplayConfig + IDXGIOutput6</div>
+        <div class="pill"><strong>Build:</strong> single C file, Windows SDK</div>
+      </div>
+    </header>
+
+    <section>
+      <h2>Fastest Win: Separate Panel Capability From OS State</h2>
+      <p>Run the tool once and you can tell whether the problem is hardware support, the Windows HDR toggle, link format, or tone-mapping assumptions.</p>
+      <pre>cl /O2 /W4 hdrinfo.c /link dxgi.lib dxguid.lib user32.lib
+hdrinfo.exe</pre>
+      <pre>HDR supported     : YES
+HDR enabled       : YES
+Bits per channel  : 10 bpc
+Color encoding    : RGB
+SDR white level   : 240 nits (slider 300.0%)
+DXGI color space  : HDR10 (PQ / BT.2020)</pre>
+    </section>
+
+    <section>
+      <h2>Workflow 1: Pick the Swap-Chain Format With Evidence</h2>
+      <p>Use the combined report as a pre-flight before choosing SDR, HDR10, or FP16/scRGB output paths.</p>
+      <ul>
+        <li><strong>HDR supported + enabled + 10 bpc:</strong> exercise the HDR path and verify tone mapping.</li>
+        <li><strong>HDR supported but disabled:</strong> avoid treating SDR compositor output as a rendering bug.</li>
+        <li><strong>8 bpc or YCbCr fallback:</strong> check bandwidth, cable, resolution, and refresh-rate constraints first.</li>
+      </ul>
+    </section>
+
+    <section>
+      <h2>Workflow 2: Normalize SDR UI in HDR</h2>
+      <p>The SDR white level gives a concrete scale factor for legacy UI brightness in an HDR desktop.</p>
+      <pre>scRGB white scale = SDRWhiteNits / 80.0
+240 nits / 80 nits = 3.0</pre>
+      <p>That turns a subjective "too dim" or "washed out" report into a reproducible value to apply or compare.</p>
+    </section>
+
+    <section>
+      <h2>Workflow 3: Capture Tone-Mapping Anchors</h2>
+      <p>DXGI luminance and primary coordinates provide practical limits for highlight clipping, full-frame brightness, black floor, and gamut expectations.</p>
+      <ul>
+        <li><strong>Max luminance:</strong> specular highlight ceiling.</li>
+        <li><strong>Max full-frame luminance:</strong> sustained bright-scene target.</li>
+        <li><strong>Min luminance:</strong> shadow floor and contrast warning.</li>
+        <li><strong>Primaries:</strong> quick check for sRGB, DCI-P3, or wider-gamut behavior.</li>
+      </ul>
+    </section>
+
+    <section>
+      <h2>Guardrails</h2>
+      <p><code>hdrinfo</code> reports OS/display metadata; it does not measure the panel with a colorimeter or prove what an application rendered. Treat it as the first diagnostic artifact, then pair it with screenshots, captures, or instrumented rendering logs when chasing visual defects.</p>
+    </section>
+  </main>
+</body>
+</html>
diff --git a/hype/index.html b/hype/index.html
index a5fde4a..bedb85c 100644
--- a/hype/index.html
+++ b/hype/index.html
@@ -91,6 +91,12 @@ <h2 class="title">modsnap</h2>
         <div class="desc">Get script-friendly module truth for a process in table, path, CSV, or count mode.</div>
       </a>
 
+      <a class="card tone-5" href="./hdrinfo.html">
+        <h2 class="title">hdrinfo</h2>
+        <div class="date">July 03, 2026</div>
+        <div class="desc">Turn Windows HDR display state into a practical report for swap-chain and tone-mapping decisions.</div>
+      </a>
+
       <a class="card tone-3" href="./quuid.html">
         <h2 class="title">quuid</h2>
         <div class="date">February 02, 2026</div>
diff --git a/reviews/hdrinfo.html b/reviews/hdrinfo.html
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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Tool Review: hdrinfo</title>
+  <style>
+    body { font-family: "Segoe UI", Arial, sans-serif; margin: 2rem auto; max-width: 900px; line-height: 1.5; color: #1f2937; }
+    h1, h2 { color: #111827; }
+    code { background: #f3f4f6; padding: 0.1rem 0.3rem; border-radius: 4px; }
+    .verdict { padding: 0.75rem 1rem; background: #eef2ff; border-left: 4px solid #4f46e5; }
+  </style>
+</head>
+<body>
+  <article>
+    <h1>Tool Review: hdrinfo</h1>
+    <p><strong>Date:</strong> July 03, 2026</p>
+    <p class="verdict"><strong>Executive verdict:</strong> <code>hdrinfo</code> is a strong fit for the repository: a single-file Windows CLI that turns hard-to-see HDR display state into actionable diagnostics. Recommendation: <strong>keep and improve</strong>.</p>
+
+    <h2>What It Does Well</h2>
+    <ul>
+      <li>Combines DisplayConfig and DXGI output metadata in one command instead of forcing manual registry, Settings, and graphics-debugger checks.</li>
+      <li>Reports both panel capability and current Windows state, which helps separate hardware, OS-toggle, and rendering-path problems.</li>
+      <li>Documents field meanings clearly enough for swap-chain, SDR-white, luminance, and gamut decisions.</li>
+      <li>Stays aligned with the repo's small-tool constraint: one C source file plus one Markdown usage/reference page.</li>
+    </ul>
+
+    <h2>Limitations and Risks</h2>
+    <ul>
+      <li>Windows-only APIs mean there is no meaningful Linux cron build or runtime check for the tool itself.</li>
+      <li>Reported luminance and primaries are metadata, not calibrated measurements; bad EDID or driver data can still mislead.</li>
+      <li>The output is plain text only, so automation must parse human-oriented labels.</li>
+      <li>No command-line switches yet for targeting one monitor, emitting JSON, or suppressing explanatory text.</li>
+    </ul>
+
+    <h2>Alternatives and Tradeoffs</h2>
+    <ul>
+      <li><strong>Windows Settings / Advanced display:</strong> easy to access but not scriptable and does not expose the full DXGI field set.</li>
+      <li><strong>DirectX diagnostics or graphics debuggers:</strong> deeper for rendering pipelines but heavier for support tickets and quick baselines.</li>
+      <li><strong>Colorimeter workflow:</strong> more accurate for calibration, but outside the low-friction diagnostic scope of this repo.</li>
+    </ul>
+
+    <h2>Workflow Fit</h2>
+    <ul>
+      <li><strong>Game/tool bring-up:</strong> run before choosing HDR10, scRGB, or SDR fallback behavior.</li>
+      <li><strong>Support triage:</strong> ask users to paste one report alongside screenshots and GPU/driver information.</li>
+      <li><strong>Display troubleshooting:</strong> identify YCbCr fallback, 8 bpc output, disabled HDR, or suspicious luminance metadata quickly.</li>
+    </ul>
+
+    <h2>Evidence Snapshot</h2>
+    <ul>
+      <li><code>hdrinfo.md</code> documents the MSVC build command, no-argument CLI, DisplayConfig fields, DXGI fields, and interpretation tables.</li>
+      <li><code>hdrinfo.c</code> declares a single-file Windows tool using DXGI, DisplayConfig, and user32-linked APIs.</li>
+      <li>The tool is listed in the release changelog; this review adds the missing Pages review parity entry.</li>
+    </ul>
+
+    <h2>Final Recommendation</h2>
+    <p><strong>Recommendation: keep and improve.</strong> The best follow-up is a <code>--json</code> mode with stable field names, plus optional monitor selection for multi-display systems.</p>
+  </article>
+</body>
+</html>
diff --git a/reviews/index.html b/reviews/index.html
index 4f80b73..355f671 100644
--- a/reviews/index.html
+++ b/reviews/index.html
@@ -69,6 +69,11 @@ <h1>Critical Reviews</h1>
         <div class="date">Review post</div>
         <div class="desc">Module snapshot workflow value and comparison to debugger-native paths.</div>
       </a>
+      <a class="card" href="./hdrinfo.html">
+        <div class="title">hdrinfo</div>
+        <div class="date">Review post</div>
+        <div class="desc">HDR/display capability report fit, source coverage, and workflow limits.</div>
+      </a>
       <a class="card" href="./quuid.html">
         <div class="title">quuid</div>
         <div class="date">Review post</div>
