Per-mechanism test
Paste a URL to see which extraction mechanism can produce a usable card. No card is written; no stats row is logged. The page runs the Chrome UA fetch automatically; the bot UA and Playwright probes are opt-in so you don't spend browserless concurrency unless you need it.
Chrome 207ms
domain: astralcodexten.com ↗
Currently stored
- site class
- clean
- extraction tier
- og
- title
- Astral Codex Ten | Scott Alexander | Substack
- description
- P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. Click to read Astral Codex Ten, by Scott Alexander, a Substack publication.
- fetched at
- 4/21/2026, 10:25:35 PM
Default Chrome UA
PASSPASS Open Graph
- title
- Astral Codex Ten | Scott Alexander | Substack
- description
- P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. Click to read Astral Codex Ten, by Scott Alexander, a Substack publication.
- image
- https://substackcdn.com/image/fetch/$s_!bGN2!,w_400,h_400,c_fill,f_auto,q_auto:good,fl_progressive:steep,g_auto/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2F430241cb-ade5-4316-b1c9-6e3fe6e63e5e_256x256.png
- canonical
- https://www.astralcodexten.com/
- type
- article
PASS Twitter Card
- title
- Astral Codex Ten | Scott Alexander | Substack
- description
- P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. Click to read Astral Codex Ten, by Scott Alexander, a Substack publication.
- image
- https://substackcdn.com/image/fetch/$s_!bGN2!,w_400,h_400,c_fill,f_auto,q_auto:good,fl_progressive:steep,g_auto/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2F430241cb-ade5-4316-b1c9-6e3fe6e63e5e_256x256.png
FAIL JSON-LD
PASS HTML tags
- title
- Astral Codex Ten | Scott Alexander | Substack
- description
- P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. Click to read Astral Codex Ten, by Scott Alexander, a Substack publication.
Bot UA (Slackbot-LinkExpanding 1.0)
Not probed yet. Run this if the Chrome UA section didn't extract what you need.
Playwright (via Browserless)
Not probed yet. Run this if the Chrome UA section didn't extract what you need.
Other mechanisms
SKIP Plugin — no plugin matches this domain
SKIP Headless (generic) — not implemented yet