Chrome extension, free
Slop Alarm reads a page or a selection and tells you whether it was likely written by AI, with the specific habits it found. Free. Bring your own API key. No server in between.
Free. No account. No subscription. You pay your provider a fraction of a cent per check.
This text shows several habits typical of AI-generated writing.
High confidence
Slop Alarm gives an estimate, not proof. AI detection can be wrong in both directions. Do not use it as the only basis for accusing anyone.
How it works
Create a free API key at console.typesafe.ai/keys or openrouter.ai/keys. Both give new accounts a small starting credit.
Open the extension's settings and paste your key. It is stored only in your browser, in chrome.storage.local, and never leaves your device except to the provider you chose.
Click the toolbar icon, press Alt+Shift+S, or right-click a selection. Slop Alarm's service worker sends the text straight from your browser to your provider. Nobody else is in the path.
Why bring your own key
Slop Alarm has no backend. The extension talks to the provider you chose directly, using your own key, and the provider bills your own account.
The text you check goes straight from your browser to TypeSafe or OpenRouter, over HTTPS, using your key. Slop Alarm's developer never receives it.
There is nothing to sign up for with Slop Alarm and nothing to sign into. Your provider key is the only credential involved.
There is no plan to pick and no recurring charge from Slop Alarm. You pay your provider directly, only for what you use.
Clear it from settings whenever you want, using "Clear local data". Nothing about it lives anywhere but your browser.
What it checks
Each check looks for patterns across these groups. A page can show more than one.
"It's not X, it's Y" contrasts, dramatic one-line closers, or announced run-ups like "Let's dive in".
Ideas forced into threes, dashes joining most clauses, or repeated sentence openings.
Ordinary facts framed as pivotal, stock words like "delve" or "tapestry", or unnamed experts.
Bold labels on every bullet, Title Case headings, or emoji section markers.
Phrases from an assistant conversation, such as "I hope this helps" or "Great question!".
This taxonomy follows Wikipedia's guide to signs of AI writing and the open-source humanizer project.
Accuracy
Slop Alarm scores writing habits, not authorship. Treat the result as a signal, not a verdict on a person.
Cost
Slop Alarm does not charge anything. Your provider bills your own account for the model calls it makes on your behalf.
$0.00008
per 250 words checked, at current provider pricing
~100 checks
for about one cent, at that rate
$0
paid to Slop Alarm, ever
Privacy
The text you check, and your API key as the request's authorization header, sent to the one provider you chose.
Settings, your key, your exclusion list, and a cache of scores keyed by a hash of the text, all in chrome.storage.local on this browser.
Off by default. It skips pages with password or card fields, webmail, online documents, banking-style hosts, and local addresses, and honors your exclusion list.
Read the privacy policy for exactly what leaves your browser and what never does.
FAQ
We don't publish a single accuracy number because it depends on the text. On the developer's small test set, no human text was flagged as likely AI, and about six in ten AI texts were caught, with the rest mostly reading "unclear". Short passages, heavily edited AI text, and formal non-native English writing are the hardest cases. See the accuracy section above for the full picture.
Only the text of the page you check or the passage you select, plus your API key as the request's authorization header. It goes to the one provider you chose, TypeSafe or OpenRouter, at their API address. Nothing goes to Slop Alarm's developer.
No. There is no Slop Alarm server. The text goes directly from your browser to your chosen provider, and the developer of Slop Alarm never receives it.
In chrome.storage.local, local to this browser. It is never sent anywhere except as the authorization header on requests to the provider you chose. Use "Clear local data" in settings to remove it.
Slop Alarm itself is free. Your provider bills your own account for each check, at roughly $0.00008 per 250 words, so about a hundred page checks cost around one cent. See the cost section above.
TypeSafe is direct from the model's maker. OpenRouter is handy if you already keep credit there. Either way, the same Jev model does the judging, and results are the same.
Jev is the decision model that judges each piece of text, made by TypeSafe and reachable through TypeSafe or OpenRouter. Slop Alarm turns its answers into a verdict, a confidence level, and named tells.
Manual checks work on most pages with readable article text. Auto-scan skips pages that look like webmail, online documents, banking-style hosts, sign-in forms, or local addresses, and you can add your own exclusions.
Auto-scan has to read whatever page you are currently browsing, and that could be any site, so Chrome asks for the optional <all_urls> permission only when you turn auto-scan on. Leave auto-scan off to avoid that permission entirely, or add specific sites to your exclusion list in settings to keep it from running there. You can also revoke the permission from Chrome's own extension settings at any time.
It may, but it is tuned and tested on English. Treat results on other languages with extra caution.
Yes, under the MIT licence. The source is at github.com/damienen/slop-alarm.
No. Slop Alarm is not listed on the Chrome Web Store. You build it yourself from source; see the install instructions.
Slop Alarm