SignalCheck runs on Claude. Plug in your own Anthropic API key and scans are unlimited — you pay Anthropic directly for usage (a full 5-query scan costs cents). Your key is stored only in this browser and sent only to our proxy to authorize your requests.
Add a payment method under Billing (you only pay for what you use)
Go to API Keys → Create Key, and copy the sk-ant-… value
Scan setup
SignalCheck asks Claude your buyers' real questions — with live web search — then reports whether you, or your competitors, show up in the answers and which sources drove them.
Write them exactly as a buyer would type them — the scan sends them to Claude verbatim.
Free scans run each query once (quick scan). With your own API key, every query runs 3× and results are averaged for reliable scores.
Scanning
Each dot is one live Claude answer, generated with web search. ● done · ◐ running · ○ queued · ✕ failed
Visibility report
0/100
Query breakdown
Citation gaps — where the answers come from
Pages Claude actually cited. If you're not on them, that's the to-do list.
Recommendations
Scan history
Stored in this browser. Re-run weekly to track your score.