kitio.aiPdfGPT.io vs Locus
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. PdfGPT.io starts at See pricing page and Locus starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- PDF summaries
- Page-linked citations
- Chat with multiple PDFs
- Exam notes
- Quizzes and study guides
- Large file support
- Natural-language page search
- PDF search
- Page and section summaries
- Study note cards
- Saved favorites
| Feature | PdfGPT.io | Locus |
|---|---|---|
| Best for | Ask questions across PDFs and get page-linked answers | Browser extension that adds AI search and summaries to pages |
| Category | Productivity | Productivity |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | Yes | Yes |
| Made by | PdfGPT.io | Locus |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
PdfGPT.io starts at See pricing page and Locus starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
2 plans
Free
Free
- 3 documents daily
- Smart search
- AI helpers
- Saved favorites
Professional
Paid
- No document limits
- Smart search and AI
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
PdfGPT.io
- Citations let you verify answers
- Handles very long documents
- Does not train on your files
- Free use is limited
- Plan details not visible on the homepage
Locus
- Finds sections without exact keywords
- Works on web pages and PDFs
- Free plan available
- Free plan is limited to 3 documents daily
- Professional price was not visible
- Browser-extension only
Which one should you choose?
Choose PdfGPT.io if you want:
- Citations let you verify answers
- Handles very long documents
- Does not train on your files
Watch out: free use is limited.
Choose Locus if you want:
- Finds sections without exact keywords
- Works on web pages and PDFs
- Free plan available
Watch out: free plan is limited to 3 documents daily.
PdfGPT.io vs Locus FAQ
What is the difference between PdfGPT.io and Locus?
PdfGPT.io: Ask questions across PDFs and get page-linked answers. Locus: Browser extension that adds AI search and summaries to pages. Both are productivity tools.
Is PdfGPT.io or Locus cheaper?
PdfGPT.io starts at See pricing page and Locus starts at See pricing page. Check both pricing pages for current plans.
Do PdfGPT.io and Locus have free plans?
PdfGPT.io: Yes. Locus: Yes.
Who makes PdfGPT.io?
PdfGPT.io is made by PdfGPT.io.
Who makes Locus?
Locus is made by Locus.
Which should I choose, PdfGPT.io or Locus?
Choose PdfGPT.io if you value citations let you verify answers and handles very long documents. Choose Locus if you value finds sections without exact keywords and works on web pages and pdfs.