Write in good faith.
Publish with evidence.

Claimlight checks factual claims as you write, shows what current evidence supports, and helps you correct only what needs correcting.

Claimlight On

I understand why people are skeptical.

NASA reported that 2024 was the hottest year on record.

That means climate models have never been wrong.

We should take the evidence seriously without overstating it.

1 supported 1 contradicted 2 not checked Review claims
ContradictedHigh confidence

Climate models have uncertainties and have produced both accurate and inaccurate projections.

Sources
IPIPCC — Evaluation of Climate ModelsPrimary source · Adds context
Correct in my voiceSee suggested wording
From draft to evidence

How Claimlight works

A finished sentence becomes a researchable claim. Claimlight traces the evidence, then gives the decision back to you.

Finish a sentence

Write naturally. Claimlight notices completed sentences that make factual claims.

Review the evidence

See whether evidence supports, contradicts, or complicates a claim—and inspect the sources behind each verdict.

Choose what changes

Accept the smallest correction in your voice, add a citation, or leave the draft as it is. You remain in control.

Evidence you can inspect

Every decisive verdict links to attributable evidence, with source context you can read for yourself.

Learn about our methodology
ContradictedHigh confidence

That means climate models have never been wrong.

IPCC — Evaluation of Climate ModelsPrimary source · 2021

“Model performance and uncertainty are evaluated across many observations.”

Relationship to claim: the source documents that model accuracy varies across metrics and time.
View source
Other sources consultedNASA — Global TemperatureNOAA — Annual Global Climate Report

Your words stay yours

Claimlight assists; you decide. It never blocks you from posting.

You're in control

Accept edits, add citations, or ignore suggestions. You always post.

Your privacy matters

Only completed claims are sent after opt-in. No account is required.

Citations are explicit

Nothing is added without your approval. You choose what to include.

Delete any time

Clear local credentials and associated Claimlight records from the extension.

Built for the places you already write

Claimlight belongs where you draft, not in a separate fact-checking workflow.

r/Reddit ComposerCurrent beta

Real-time claim checks while you write posts and comments on Reddit.

Listing pending review
Standalone EditorAvailable now

A full-featured editor to write and check claims with no sign-up required.

Try the live editor →
XXLater

X remains disabled until its composer behavior passes dedicated release testing.

Coming later

Try the live editor

Start with a blank draft. Claimlight checks only after you opt in.

Read how your draft is processed →
Standalone editor

Draft a comment

Write with confidence. Publish with evidence.

Try the live editorRead the methodology →