How the fact check works, sentence by sentence.

Most fact checks give one verdict for a whole video or article. That’s rarely fair. A single clip can hold a true sentence, an exaggeration and a plain mistake within thirty seconds. So RealUp checks one sentence at a time.

What happens when you tap Fact check

You mark a passage in your board’s summary and tap Fact check. Then RealUp:

• Splits the passage into sentences, so every claim gets its own verdict. Very short fragments are joined to the sentence before them, and up to eight sentences are checked at once.
• Searches the web for evidence. A check from memory would happily approve anything that was copied cleanly from a bad video, which is exactly what it’s meant to catch.
• Gives every sentence a colour and a short reason, together with what it found.

The five colours

• SupportedCheckable, and confirmed by sources found on the web.
• OversimplifiedNot wrong at its core, but cut down or generalised so much that it misleads.
• Mixed evidenceThe evidence disagrees, depends heavily on how it was measured, or nothing solid could be found.
• FalseClearly doesn’t hold up, whatever the angle or the method.
• OpinionNot a checkable fact at all, but a judgement, a recommendation or a guess about the future.

Opinion sits apart from the other four. It isn’t “less true”. It’s simply not the kind of sentence you can check.

Four rules behind every check

No green from memory. If RealUp can’t find evidence, a sentence turns yellow, not green, and the result says clearly that no source was found. If nothing usable comes back at all, the sentence stays uncoloured.

Only what you mark. RealUp never checks a whole board on its own. You decide what’s worth checking, and each check uses a few credits.

The structure, not the side. A verdict depends on what kind of statement it is, a fact, a judgement or a shortcut. Never on its political direction.

The colour sits behind the text. Like a highlighter, never on the letters themselves, so every sentence stays easy to read.

When the text changes, the colours go

Colours stay until you clear them. If you edit the summary, they disappear on their own. A colour belongs to one exact sentence, and after an edit it could land on the wrong one.

What it can’t do

The fact check is an AI with a web search. It’s careful, and it shows you what it found, but it can still be wrong. Treat it as a strong first look, not a final ruling. That’s why every verdict comes with a reason: so you can check the checker.

Want to see it on a real myth? Read Do we really only use 10% of our brain?