CrimsonSeek

CrimsonSeek is an evidence-backed debate opponent. Bring any claim, take a side, and CrimsonSeek argues the strongest fair countercase with credible sources attached.

It works using a Gemini-powered opponent that reads your position, chooses the opposing side, searches for evidence via the Linkup Search API when receipts matter, and keeps the source trail visible.

View demo examples

Demo

CrimsonSeek evidence audit with source panel

Product

Debate-first flow

Pick a starter or bring anything, then argue with CrimsonSeek in a thread.

AI stack

Gemini 3.1 Flash Lite handles the debate logic because Google AI Studio's free tier has generous rate limits.

Adaptive evidence retrieval

Gemini decides whether a claim needs Linkup, how many sources are useful, and how recent the search should be before CrimsonSeek retrieves evidence.

Credible-source posture

The retrieval prompt and source-quality filter prefer primary sources, reports, reputable reporting, benchmarks, documentation, and expert analysis.

Inspectable sources

Inline citation anchors and the Sources control open the exact evidence card behind a counterargument.

Exportable threads

Debates can be exported as a PDF for review or sharing.

Linkup

CrimsonSeek uses Linkup Search for live web grounding. The app requests sourced answers from /v1/search, asks for citation-ready material, and uses adaptive depth with recent-first windows for fast-moving debates. Query guidance and domain filtering push results toward high-quality, evidence-bearing sources.

Run locally

npm install
npm run dev

Create .env or .env.local with your Linkup and Gemini keys.

LINKUP_API_KEY=your_linkup_key_here
GEMINI_API_KEY=your_gemini_key_here
GEMINI_MODEL=gemini-3.1-flash-lite

Stack

Next.js 15, React 19, TypeScript, Tailwind CSS v4, Linkup Search API, Gemini 3.1 Flash Lite, and jsPDF.