PostSpy is currently a developer-preview build — you'll load it into Chrome manually. The Chrome Web Store listing is coming.
Grab the latest packaged extension (a ZIP file). Unzip it anywhere on your machine — you'll point Chrome at the unzipped folder.
Download postspy.zip~1 MB. Unsigned developer build — Chrome will mark it as such.
chrome://extensionspostspy/ folderPostSpy will appear in your extension list and pin to your toolbar (you can pin it manually if it doesn't).
PostSpy uses your own Anthropic key (for the matching AI) and Resend key (for emails) — costs stay yours, data stays yours.
In Chrome, click the PostSpy icon → side panel opens → click Options in the header → paste both keys + your "from" and "to" email. Save.
Open a Facebook Group you've joined, or a Marketplace search URL. Click the PostSpy icon. In the side panel, click + Add this page to PostSpy. Tell the AI what you want in plain English. Done.
AI: What are you looking for on "Sydney Tradies"?
You: carpenter jobs
AI: People offering carpentry, or people needing one? Any area or urgency?
You: people needing one, Sydney, urgent ones especially
AI: Saving: "People in Sydney needing a carpenter, prioritise urgent posts." I'll check this page every 5–10 min and email you matches. Sound good?
You: yes
A few things to know once you're set up.
PostSpy fires its checks from Chrome's service worker. If Chrome quits, the watcher stops. Set Chrome to launch on login (System Settings → General → Login Items) so you don't think about it.
PostSpy shares your normal Chrome cookies. If you log out of Facebook, the next background check will detect it and show a banner asking you to log back in.
Posts you scroll past in your normal browsing are also captured — so if you happen to be on a watched group, PostSpy spots matches in real time, no background tab needed.
If a match isn't useful, hit 👎 on it in the side panel. PostSpy uses that feedback to tighten thresholds on that watch automatically.
Open the side panel → click Check now in the header. Watch the page (manually) and verify the content script is extracting posts (you'll see them in the "seen" badge). If the group is low-volume, this is normal — try a busier group or a Marketplace search.
Your Facebook cookies expired or you logged out somewhere. Open facebook.com in Chrome, log in normally, and the banner clears on the next check.
Either verify a domain you own at resend.com (~5 minutes of DNS) and use a "from" address on that domain, or use Resend's sandbox onboarding@resend.dev — which only sends to the email you signed up with.
Open Options → lower the daily email cap. Or 👎 a few false positives in the side panel — PostSpy will tighten that watch's threshold automatically.
Questions? Check the FAQ or email us.
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