Locus

Locus is a Chrome browser extension for students, researchers, and analysts that rethinks Ctrl+F with natural language search and AI help for reading web pages and PDFs.

Key features include:

• Smart Search (AI Ctrl+F): ask questions in natural language to jump to the most relevant section of a page, even when exact keywords are unknown
• PDF and web page search: apply the same AI search workflow across long articles, documents, and PDFs
• AI Helpers for research: summarize entire pages or selected sections, brainstorm related topics and follow-up reading, and generate study note cards
• Favorites and history: save highlighted answers and excerpts as Favorites for quick recall across documents

Pricing: Freemium. Free plan includes Smart Search and AI with daily limits (listed as 3 documents daily). Professional is $9/month (or $7.5/month billed annually, $90/year) with no limits, faster processing, newer AI models, role selection, and optional OpenAI API key integration for unlimited OpenAI use.

Notable for combining natural-language page find, AI summarization, and saved highlights in a lightweight extension designed for navigating dense reading, not general chat.