Reliably check claims in your browser

Building the most reliable fact checking Chrome extension available

Fact check any claim instantly

We are trying to accomplish one thing. Reliable and verifiable fact checking inside a web browser

Most fact checking tools just ask an AI model and hope that its right. We dont. Every claim is tied to primary sources, has transparent reasoning and auditable results.

Explore

How does Certain work

Set up is really easy and integrated with our dashboard

Step 1

Add the chrome extension

Click add to chrome from the dashboard or from the chrome store

Step 2

Highlight any claim

On any webpage or document in your browser, highlight the text, right click and select verify

Step 3

Get an instant verdict

Certain checks it against reliable sources and shows a verdict with citations.

Pricing

Here is what we offer

Find the perfect Certain plan to match your needs

Free

For checking the occasional claim

$0 per month

10 checks per month
3 primary sources per claim
Full reasoning and results

Premium

For regular checking while studying or working

$6.99 per month

50 checks per month
Everything in Free
Email support

Pro

For people who verify claims every day

$14.99 per month

150 checks per month
Everything in Premium
Priority support
Early access to new features

Frequently Asked Questions

Here are some common questions we get asked

How do I check a claim?

With the browser extension enabled on chrome, simple highlight any text on the page and right click and select 'Verify'

How accurate is it?

Certain is built to show its work. We have a database of credible sources that are get checked before any other source. When evidence is thin, mixed or a claim cant be verified for certain, it says 'unverifiable'

Whats the difference between the Free and paid plans?

Free includes 10 verifications per month. Premium includes 50 verifications per month and Pro includes 150 per month and they both use more reliable sources and judging.

What happens when I reach my limit?

On the free plan, your allowance resets on the 1st of every month. For paid plans, it resets at the start of each billing period. When you hit your limit, you will be prompted and can upgrade for more checks straight away

Can I cancel anythime?

Yes. You can cancel or change your plan anytime from the dashboard, and you will keep your full access until the end of your current paid period.

Is my data private?

Certain only processes the specific text that you choose to highlight and verify, it doesnt track your general browsing. We retain all claims and verdicts as a source of truth, so that we can continuously make our product more reliable.