What if everything you “know” is wrong?
Some things get repeated so often they stop sounding like claims. Until you actually check them.
The Great Wall of China is visible from space.
Humans only use 10% of their brain.
Napoleon was short.
Surprised?
These are things millions of people repeat every day. Nobody checks. Lenz does. It stress-tests any claim against real evidence — and the results are often not what you’d expect.
Lenz is a fact-checking tool that researches any claim across multiple sources, stages a debate between AI models, and delivers a verdict with a truthfulness score from 1–10. Think of it as a myth-busting machine — for anything.
Try these
- We swallow 8 spiders a year in our sleep
- Lightning never strikes the same place twice
- Goldfish have a 3-second memory
- Cracking knuckles causes arthritis
- Bats are blind
- Sugar makes kids hyperactive
- Shaving makes hair grow back thicker
- You lose most body heat through your head
How it works
- Paste a belief — anything “everyone knows” that you want to test
- AI investigates — multiple models research real sources, argue both sides, and cross-examine
- Get the truth — a sourced verdict that either confirms what you thought or blows it apart
Frequently asked questions
What kind of beliefs can Lenz check?
Common myths, popular sayings, old wives’ tales, and anything
that falls into the category of “everyone knows.” If it
can be verified against evidence, Lenz can check it.
How does Lenz know if a belief is true or false?
Lenz researches the claim across multiple independent sources, stages a
structured debate between AI models, and delivers a truthfulness score
from 1 to 10.
What if the answer is more complicated than true or false?
Lenz uses nuanced labels — True, Mostly True, Misleading, and
False — so you get a verdict that reflects the complexity of
the evidence.
Is Lenz free?
You get 5 free fact-checks per month — no credit card required.
Need more? Subscriptions unlock more.
Stop repeating. Start checking.
Pick a belief you’ve always accepted and find out if it holds up.
Test a belief now