Free Chrome extension · YouTube

The video keeps talking.Claimek keeps checking.

Captions move faster than anyone can check them. An AI model reads along, picks out the claims worth checking, and shows you what fact-checking groups have already said, right on the player.

No account
No microphone
No tracking
Nothing to configure
RATED FALSE Claimek
Guyabano leaves are stronger than chemotherapy.
Rated False by VERA Files. No clinical trial has shown guyabano treats cancer in people.
View source ↗ 97% confidence
❚❚
…kasi ang dahon daw ng guyabano ay mas malakas pa kaysa chemotherapy, kaya marami ang tumitigil na sa gamutan nila…
09:41 / 12:44 CC
GUYABANO: ang halamang tinatago sa atin · Juan Wellness PH · 284K views
01 · Why it matters

Misinformation doesn't announce itself.It sounds like everything else.

A false claim comes with the same confident voice, the same good editing, and the same familiar face as a true one. By the time you stop to wonder about it, the video has already moved on.

It reads every line, so you don't have to

You can't open a new tab for every claim you hear. An AI model reads along with the captions and picks out the handful of sentences that are actually checkable, while the words are still on screen. It does not get bored on hour three.

It stays quiet when things check out

Most claims are fine, and Claimek says nothing about them. It only speaks up when something is rated misleading or worse. A tool that warns you all day gets switched off. One that warns you rarely gets believed.

Built for how Filipinos actually watch

Most tools break on code-switching. The model behind Claimek reads English, Filipino, and Taglish in the same sentence, because that is how our videos actually sound. Health myths, viral "alam mo ba" facts, political lines, all read in the language they were said in.

02 · How it works

Three steps,all while the video plays

01 — LISTEN

It reads the captions you already see

Claimek reads the caption text on the player, the same words already on your screen. No microphone, no recording, no camera. If a video has no captions, there is nothing for Claimek to read.

02 — FILTER

It picks out checkable claims

Opinions, jokes, and questions are left alone. Only statements of fact that can be checked, like "X causes Y" or "the law says Z", are sent to our server.

03 — FLAG

It shows its work

Each flag shows how serious the problem is, a short plain-English summary, and how sure the check is. If a fact-checking group has already written about the claim, you get a View Source link so you can read their article yourself.

03 · How flags are labelled

Five levels.You only ever see three.

Every claim we check gets a level from 1 to 5. Levels 1 and 2 are dropped on our server before they ever reach your browser, so Claimek never interrupts you just to say something was fine.

1
Looks true

Nothing to raise. You never see this one.

2
No clear answer

Nothing solid either way. Also never shown.

3
Some doubt

True in part, but said in a way that misleads.

4
Strong doubt

Mostly wrong, with only a small bit of truth in it.

5
Strongest doubt

Goes against what the evidence shows.

What the flag actually says depends on where the answer came from, and Claimek always tells you which of the two it was.

A fact-checking group has covered it

You see their rating, in their words

  • Claimek shows the rating the group published, names the group, and links to their article.
  • You can read the original and decide for yourself.
  • Claimek is passing on their work, not adding its own opinion.
MISLEADING MOSTLY FALSE FALSE
No group has covered it yet

You see an automated read, worded as doubt

  • Claimek says the claim looks shaky and why. It does not declare the claim false.
  • Every flag like this is marked Automated check, with no source link, because there is no article behind it.
  • Treat it as a reason to look further, not as an answer.
WORTH CHECKING LIKELY INACCURATE VERY LIKELY INACCURATE

Automated checks can be wrong, which is why we show how sure the check is instead of hiding it, and why every flag carries a Report this flag link. Tell us one is wrong and we look at it.

04 · Privacy, in one screen

A tool that checks claimsshould be easy to check yourself

So here is exactly what Claimek uses, and what it never touches. The full policy says the same thing, just in more words.

What Claimek uses

  • Caption text from the video you are watching, sent to our server only when it holds a claim worth checking
  • The video link you are watching, so flags go back to the right tab
  • Your IP address, used briefly to cap how many checks one person can run, because each check costs us money
  • Anonymous usage counts, such as how much of a video was checked and how many flags appeared, with nothing tying them to you

What it never touches

  • No account, no email, no name, because there is nothing to sign up for
  • No microphone or audio, only the captions already shown on the page
  • No browsing history — Claimek only turns on for YouTube videos, and stays off everywhere else
  • No selling of your data, ever. It is used to check your video and nothing else
05 · Under the hood

The modelis the easy part

Calling an AI model takes an afternoon. Keeping up with a playing video, without re-asking a question already answered, is where the work went. Four gates, in order, cheapest first.

01

Filter in the browser

Captions are de-duplicated, buffered, and screened for complete thoughts on-device. Fragments, questions and repeats never leave the machine.

02

Check what is already known

A two-tier cache, in memory and in Postgres, answers any claim that has been seen before without a fresh lookup.

03

Ask the fact-checkers first

Published human ratings are queried before any model runs. A rating a person wrote beats a generated one, so it is tried first, not second.

04

Then, and only then, the model

Whatever survives all three gates gets a structured-output call, run concurrently and streamed back so the first flag appears without waiting for the slowest.

Built with PythonFastAPIasync SQLAlchemyPostgresServer-sent eventsOpenAI structured outputsGoogle Fact Check ToolsChrome MV3pytest
FALSE WORTH CHECKING MOSTLY FALSE LOOKS TRUE
Before you go

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