SummaryLens - Discussion Intelligence

Understand Reddit and YouTube discussions with private, on-device AI: structured summaries, positions, insights and source comments.

SummaryLens turns long, chaotic discussion threads into clear, structured summaries — instantly and completely on your device. Powered by Chrome's built-in Gemini Nano AI, it reads the thread you're viewing and produces a concise overview plus the main positions people take, each backed by links to the exact comments. AI processing runs locally in Chrome: no remote AI service, no account, and no subscription. Key features Instant AI summaries — One-click TL;DR of any thread — the topic, the tone, and the 5–8 key points, generated on-device. Works on threads with 15+ comments; larger threads are processed in parallel chunks for speed. Camps & arguments — Identifies the main sides people take in the discussion and summarizes their arguments. Every argument includes a citation — click it to jump straight to the source comment and highlight it on the page. Real-time live writing — Watch the summary being written in the side panel, stage by stage ("Writing Overview…", "Writing Camps & arguments…") with progress and remaining-time estimates. Smart language detection — Automatically detects the thread's language (30+ languages) and writes the summary in that same language — English, German, Romanian, Arabic, Japanese and more — using Chrome's multilingual on-device model. Instant title detection on video change — no page reloads needed (YouTube SPA support). Consensus indicator — At a glance color bar shows whether the community is mostly in agreement, split into two camps, or contested. Summary cache — Already summarized threads load instantly from a local on-device cache (24h) — no repeated AI runs. History & Markdown export — Browse your last 5 summaries with direct links back to the threads. Export any summary as clean Markdown — perfect for notes, newsletters or sharing. Supports your favorite communities — Reddit (new & old design) · YouTube (watch pages & Shorts) · Hacker News. How it works Open any supported thread in Chrome. Open the side panel and click Summarize thread. Read the overview, explore the camps, and click any citation to jump to the exact comment. Privacy first No servers. No accounts. No tracking. AI processing happens locally via Chrome's built-in AI models. Thread content is processed locally for summarization and is never sent to our servers or a third-party AI service. Summaries are cached only on your device and are deleted when you remove the extension. Requirements Google Chrome 149+ with the on-device AI (Gemini Nano) enabled. Free forever. AI inference stays on-device once the required Chrome AI models are downloaded.