Finds the claims
Pulls the check-worthy claims out of any text, post, article, or screenshot — you don't have to spot them yourself.
Litmus · A Kan Labs app
Test what
you read.
A private, on-device fact-checker. Litmus finds the check-worthy claims in any text, post, article, or photo — and rules on each one with up-to-date, web-searched sources.
Coming soon to the App Store
What Litmus does
From a wall of text
From a wall of text
to a clear verdict.
Rules on each one
Marks every claim True, False, Misleading, or Unverifiable — each with a confidence level you can weigh.
Cites real sources
Shows the actual sources behind each verdict, retrieved by live web search — not a confident guess.
Shows counter-evidence
When something is false or misleading, Litmus doesn't just flag it — it tells you what's actually true.
Topics & history
Tags every check by topic and keeps a searchable history, so you can reuse and revisit what you've verified.
Everywhere you read
Check in the app, from the share sheet in any app, or hands-free: "Hey Siri, fact-check my clipboard."
Private by design
Your reading never
Your reading never
passes through us.
Litmus does the heavy lifting on your device and uses your own provider key for the final verdict. We don't have servers, and we collect nothing.
- On supported devices, claims are extracted entirely on-device with Apple Intelligence — instant, offline, and free.
- Your API key is stored in the device Keychain and used only to talk to the provider you chose.
- No accounts, no tracking, no analytics, no ads, and no developer servers.
Before you start
Bring your own key.
Litmus uses your own API key from OpenAI or Anthropic (Claude). Add it once in Settings — your key, your usage, your control. The on-device steps are free; only the final web-searched verdict uses your provider.