Locus 
Locus is a browser extension for searching, understanding, and asking questions about webpages and online content.
Starting price Free + from $7.50/mo
Tool Information
Locus is a browser extension for searching, understanding, and asking questions about webpages and online content.
Users install the verified extension, restrict site permissions, exclude confidential pages, request source-grounded answers, compare summaries with the original, and disable access when not needed.
Free limited access is available and paid access starts from $7.50 per month; searches, AI features, pages, and billing cycle vary.
Browser assistants can read sensitive content, follow prompt injection, or hallucinate summaries. Least privilege, privacy, source comparison, security updates, and human verification matter.
F.A.Q (3)
Pros and Cons
Pros
- Locus reimagines browser find with natural-language search
- Users can locate concepts without remembering an exact keyword
- The extension searches ordinary web pages
- PDF search supports long papers and documents
- Relevant sections are surfaced directly from the source
- Whole-page summaries accelerate initial reading
- Selected portions can be summarized separately
- AI helpers can brainstorm follow-up research topics
- Generated note cards support study and retention
- Favorites preserve useful passages for later reference
- Search history makes earlier research easier to revisit
- The free plan supports three documents per day
- Professional access removes stated document and action limits
- OpenAI integration lets subscribers bring an API key
- Role selection personalizes the AI assistance
- Monthly and discounted annual subscription choices are published
Cons
- Locus summaries can omit caveats or misrepresent source conclusions
- Semantic search can miss a passage that exact keyword search would find
- PDF scans; columns; formulas; and tables can reduce retrieval quality
- A browser extension can access sensitive page content within granted permissions
- Researchers should review Locus privacy and retention terms before confidential use
- Saved favorites and history create account data that needs protection
- The free plan is limited to three documents per day
- Professional pricing information appears inconsistent across sections of the page
- Unlimited OpenAI use requires the user's own paid API key
- Named model options on the page include older model generations
- A daily index refresh may not capture immediately changed pages
- AI-generated study cards can reinforce an incorrect interpretation
- Brainstormed sources are suggestions rather than verified citations
- Paying removes limits but does not guarantee factual accuracy
- Academic users must still cite and read the original documents
- The extension's value depends on ongoing browser and PDF compatibility
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Overview
Before you subscribe
- Check the currency, billing period, automatic renewal, usage limits and seats at checkout — prices and promotions change.
- App-store pricing can differ from website pricing by country, device and tax.
- Share only authorised data, and read the provider's encryption, retention and model-training terms first.
- AI output can be incomplete or wrong. Verify facts, citations, calculations and code before you publish or ship.
- Commercial usage rights vary by plan, provider terms and jurisdiction.
- None of these tools replaces a qualified professional for medical, legal or financial decisions.
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