locus
Locus helps researchers, analysts, and students find relevant passages in web pages and PDFs with natural-language search, then summarize and work with what they find using AI.
One of 141 tools in Research
Who it's for
- Researchers reading dense papers who need to locate sections and synthesize information.
- Analysts reviewing news and articles who want to identify relevant sections quickly.
- Students using online textbooks or PDFs who need to find and revisit specific material.
Not the right fit if…
- Free-tier users who need unlimited documents or AI actions: the Free plan has daily limits on documents and AI actions.
How it fits your workflow
Add Locus to a browser and use it on a web page or PDF. Enter a natural-language query to find a relevant section without needing the exact keywords.
Use AI assistance to summarize a whole page or a selected portion, brainstorm research topics, or create study note cards. Save useful information with Favorites to refer back to it later.
Pricing
Free: The free plan costs $0 forever and includes natural-language search on web pages and PDFs, Favorites, search history, and AI-based summarization, with daily limits on documents and AI actions.
Free
$0 forever
- · Natural-language search
- · Web pages and PDF documents
- · Daily refresh of index
- · Search history
Professional (annual billing)
$7.50/month, billed annually ($90); 30-day free trial
- · All Free features
- · Advanced AI models
- · OpenAI integration
- · Faster processing
Professional
$9/month; 14-day free trial
- · All Free features
- · No document limits
- · Newest AI models included
- · Choose your AI role
Prices checked on Oct 17, 2026 from the vendor's site. They can change; confirm before you buy.
Key features
- Natural-language Smart Search
- Searches web pages and PDFs based on a user's natural-language query and finds relevant sections, including results that may not be possible with ordinary Ctrl+F.
- AI research assistance
- Uses AI models to help synthesize information and create outputs that support research.
- Summarization
- Summarizes entire pages or selected portions to help users review long content.
- Research brainstorming
- Suggests additional research topics and other documents to read.
- Study note cards
- Creates note cards intended to help users retain key information and memorize answers.
- Favorites and search history
- Lets users save information and refer back to documents and highlighted search answers; the free plan also lists search history.
Works with
- OpenAI
- Anthropic Claude
- Google Gemini
Limitations to know
- The Free plan has daily limits on the number of documents and AI actions.
Alternatives to consider
-
Doclime
Choose it if your work is focused on chatting with PDFs and you need referenced extractions or support for scanned documents, as described in its product description.
Getting started
- Add Locus to your browser from the product page.
- Use Smart Search on a web page or PDF to locate relevant content with a natural-language query.
- Try the AI helpers for summarization, research brainstorming, or study note cards.
- Sign up for a free account to unlock the additional functionality described on the page.