TrueHigh confidence

Honey never spoils when stored properly.

Claim · Honey can keep almost indefinitely under proper storage.

Honey's low water content and acidity make it inhospitable to microbes. Sealed jars recovered from ancient Egyptian tombs were reportedly still edible.

The science of honey's long shelf life· Smithsonian Magazine · 2013Honey storage and shelf life· National Honey Board · 2023
FalseHigh confidence

Goldfish only have a three-second memory.

Claim · Goldfish can remember things for only three seconds.

Behavioural studies show goldfish can learn routines, recognise patterns, and retain memory for months, far beyond the three-second myth.

Do goldfish really have a 3-second memory?· Live Science · 2023Goldfish memory myth· Discover Wildlife · 2024
ContestedMedium confidence

Eating breakfast is essential for losing weight.

Claim · Skipping breakfast undermines weight loss for most adults.

Randomised trials are mixed: some find a modest benefit, others find no effect or the opposite. Individual response and total daily intake matter more than the meal's timing.

Breakfast and weight change: a systematic review· BMJ · 2019Time-restricted eating and weight loss· JAMA Internal Medicine · 2022
UnverifiableLow confidence

There is intelligent life on other planets.

Claim · Intelligent life exists somewhere beyond Earth.

No primary observation, signal, or biosignature confirms or rules this out. Mainstream science treats the question as open, not answered.

The search for extraterrestrial intelligence· NASA Astrobiology · 2024Are we alone? An update on the search· Nature · 2023

Fact-check YouTube claims without leaving the video.

Press the check button, pick the claim you care about, and read a source-backed verdict while the video stays right where it is.

Desktop Chrome only. Free to install. No credit card required.

Live demo

See the extension working.

Four steps. Zero tab-switching.

The interactive demo lives here, but WasThatTrue is a desktop Chrome extension. Open this page on a laptop to see it in action.
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This is interactive, give it a try!

youtube.com/watch?v=xK29jR8m
“...the Amazon rainforest stores 150 billion tonnes of carbon, produces twenty percent of the world's oxygen, and we're losing a football pitch of it every six seconds.”
14:32 / 38:17
Inside the Amazon: Why the World's Largest Rainforest Matters
Earthwise Documentaries
1.4M subscribers
2.1M views / 3 days ago
A long-form look at the Amazon basin's ecology, carbon cycle, and the threats deforestation poses. We separate the facts from the figures...
You hear something that sounds off. The speaker is making a bold claim mid-video. You do not have to open a new tab or remember to check it later.
The extension reads what was just said. It pulls the factual claims out of the last few seconds of captions. No credit has been spent yet.
You decide what gets checked. Pick one claim, pick a few, or skip the ones you already trust. A credit is only spent when you verify.
The verdict appears, right there. Verdict, confidence, explanation, and sources sit beside the video without stealing your place.
Product principles

Built for honest answers,
not engagement.

No algorithm decides what gets checked. No black box decides the verdict.

You trigger it. Not us.

Nothing is checked automatically. There is no passive surveillance of what you watch. You decide what warrants scrutiny, every time.

Primary sources, cited.

Every verdict links directly to peer-reviewed studies, government data, and established institutions. You can read the evidence yourself, always.

Honest about uncertainty.

Contested claims are labelled Contested. Unverifiable claims are labelled Unverifiable. We don't force certainty where none exists. Doubt is a real answer.

Verdict language

No spin. Four honest labels.

The evidence determines the verdict, not the narrative.

True
Supported by evidence
The claim is corroborated by peer-reviewed studies or primary sources with high confidence.
False
Contradicted by evidence
The claim is directly refuted by credible, verified sources. The sources are listed so you can read them.
Contested
Genuine expert disagreement
Credible studies exist on multiple sides. We label it contested and show both positions, not a forced verdict.
Unverifiable
Cannot be confirmed
No credible evidence exists to confirm or deny the claim. We tell you that, rather than guessing.
Why it exists
“Built to combat misinformation in the age of post-truth politics.

In an age of deepfakes and deliberate attempts to pollute our information landscape, the responsibility falls upon each of us to fact-check what we consume.

YouTube is the world's second-largest search engine. Billions of people form their beliefs about vaccines, climate, economics, and politics from what they watch.

WasThatTrue gives those viewers a tool, not an opinion. Honest about what the evidence says. Honest about when it doesn't.

Stop wondering.
Check the claim.

Add WasThatTrue to Chrome and get source-backed verdicts on YouTube, right where the claim was made.

Desktop Chrome only. Free to install. No credit card required.