Well, (f)actually…
"So what you're saying is…"
Catches every claim, live, while you watch. Local-first inference option. Cross-vendor consensus on the cloud path.
Play the video — the sidebar on the right reveals fact-flag cards as the clip plays. It's the same UI the extension renders on YouTube, driven here by a synced preview timeline.
Use the recorded / live toggle in the sidebar header to switch modes. Recorded mode replays a transcript-verified session against actual sources. Live mode fires real Gemini 2.5 Flash calls per transcript segment (expect ~3-9s per card). Drag the Sources slider to change which citation family each flag pulls from.
Cards cover the full 29-minute interview — scrub anywhere and the sidebar stays in sync. Earlier flags pre-load on the dossier; new ones land as the playhead crosses each timestamp.
Some of our favorite fact checking resources.
One-paragraph briefing on the video before captions arrive.
1–5 confidence scale, traffic-light coloring, pulse animation on high-confidence cards.
Every non-skipped flag gets an authoritative source attached asynchronously.
Five sourcing profiles — Primary, Centrist, Left, Right, All. Same product, both ends of the spectrum.
Opt-in. High-confidence flags get a second opinion from Meta Llama 4 + xAI Grok in parallel. "Consensus" badge when 2-of-3 vendors agree.
Bottom-of-player overlay on top flags. Follows fullscreen.
Any timestamp in the sidebar re-seeks the video.
Markdown log of every flag with YouTube deep-links back to the moment.
Bias slider
The model's classification stays constant — what a flag is doesn't change based on your politics. The citation attached to each flag does. Move the slider on the demo to see it; the table below shows where each profile pulls from.
Left-leaning publications, progressive think tanks, labor-oriented sources.
EPI · Guardian · Vox · NYT · MSNBC
Mainstream non-partisan outlets and centrist think tanks.
Pew · Brookings · Reuters · AP · BBC
Right-leaning publications, free-market think tanks, conservative academic sources.
AEI · Heritage · Quillette · WSJ · NRO
Peer-reviewed papers, primary government data, original source documents — no media intermediary.
NBER · JSTOR · BLS · ONS · JPSP · transcripts
No source-lean preference — whatever search ranks highest.
Wikipedia · top SERP · mixed
Under the hood: the classifier (Gemini 2.5 Flash) decides what gets flagged identically regardless of profile. A separate Gemini call with Google Search grounding fetches the citation — the profile injects a source-preference into that prompt, which biases the search ranking. Same claim, different supporting link.
Local-only mode
No cloud calls, no API costs, no caption data egress. The entire pipeline — caption ingest, claim extraction, fact-check, citation retrieval — runs on your hardware via a local LM Studio endpoint.
Real privacy, not "we promise we won't log it" privacy.
Cloud path
Cloud mode authenticates directly against your Google Cloud Vertex AI project. There's no SaaS proxy between you and the model — the extension talks to Google, you pay Google, and there's nobody in the middle to leak, log, or rate-limit you.
Five minutes. Developer-mode unpacked extension — Chrome Web Store listing comes later.
Download the latest release
Grab the zip from the releases page and unzip it anywhere.
Open chrome://extensions
Paste it into the URL bar — Chrome blocks linking to chrome:// pages directly.
Toggle Developer mode
Top-right corner of the extensions page.
Load unpacked
Click Load unpacked and point at the unzipped chrome-extension/ folder.
Fill in Options
Cloud mode: paste your Vertex AI project ID + a bearer token from gcloud auth print-access-token. Optional: drop in a free Google AI Studio key to route citations + dossier through a separate quota pool. Local mode: LM Studio endpoint URL.
Visit a YouTube video
The sidebar opens automatically. Receipts start arriving as the captions flow.
Turn on captions (CC) on the video
Click the CC button in YouTube's player controls before pressing play. The extension reads the live caption track from the page — without CC enabled at least once on the video, the sidebar stays at "waiting for captions…"
Free covers everything you need to start fact-checking today. Pro is one click and $3.50/mo — for now it just kills the ads, but we'll layer in more as features ship.
Everything that ships with the extension today.
Everything in Free, plus:
v0.6.0 (May 2026) added a Google AI Studio fallback — paste a free AI Studio key in Options and citation + dossier route through generativelanguage.googleapis.com instead of Vertex AI. The Download button always serves the latest release.