Free
A personal library to read and annotate.
$0/month
No card needed
Start for freeWhat's included
- 50 papers
- 30 cited answers a month
- PDF reader with highlights and notes
- Import by PDF, DOI, arXiv id or Zotero
- 2 GB of storage
Everything you need to transform research into knowledge
01 / 05Scroll to explore
Every paper you have, in one searchable library.
Drop in PDFs, paste a DOI or arXiv id, or import your Zotero library with its collections. Each paper is parsed, enriched from Crossref and OpenAlex, and ready to read, search and cite.
01Library and import
Every paper you have, in one searchable library.
Drop in PDFs, paste a DOI or arXiv id, or import your Zotero library with its collections. Each paper is parsed, enriched from Crossref and OpenAlex, and ready to read, search and cite.
02Smart PDF reader
Built for researchers who read beyond the abstract.
Highlight in four colours, keep notes on the page, and ask for an explanation of any passage in the context of the paper. The reader remembers where you stopped and how long is left.
03AI research assistant
Ask your library anything. Get answers you can verify.
Answers are grounded in your own papers, every sentence carries a citation, and a click opens the passage in the reader at that page. When the evidence is not there, the assistant says so.
04Research graph
See how every claim in your research connects.
Claims, methods and findings are extracted from your papers with their exact quotes, linked by citations and by what they support or contradict, and the gaps between them are flagged for review.
05Writing workspace
Write with your sources at your fingertips.
Draft with inline citations in APA, MLA, Chicago, IEEE or Nature, check every claim against the page it cites, draft from selected evidence, and export to Markdown, LaTeX or Word.
Ask anything. Every answer cites its source.
Can you explain this in simpler terms?
AI Insight
This section introduces a sparse attention mechanism that helps the model focus only on the most relevant tokens instead of all of them. By doing this, it reduces the amount of computation and memory required while still maintaining performance.
Pricing
Start free. Upgrade when your library grows.
Free for a personal library, Pro for a working researcher, Team for a lab. Prices in USD; change or cancel at any time.
Pro
Most popularFor a working researcher with a growing library.
$12/month
Billed monthly
Start ProEverything in Free, plus
- Unlimited papers
- 1,000 cited answers a month
- Research graph and gap candidates
- Writing workspace with verified citations
- Export to Markdown, LaTeX, Word and BibTeX
- 50 GB of storage
Team
For a lab that reads and writes together.
$20/month per seat
Billed monthly, per seat
Start a teamEverything in Pro, plus
- Shared projects and collections
- Supervisor and student roles
- Reading assignments and review queues
- Admin controls and an audit trail
- Central billing per seat
- 250 GB of storage
Enterprise
Single sign-on, audit requirements, negotiated storage and support, priced by contract for departments and institutes.
- What counts as a cited answer?
- One question to the research assistant, answered from your own papers with page citations. Reading, highlighting and searching are never metered.
- Do I have to leave Zotero?
- No. Import a library or a few collections with their PDFs whenever you like; papers already in Carrel are skipped, so the import can be run again.
- Who can see my papers?
- Only you and the members of the projects you share. PDFs live in private storage behind expiring links, and you can export or delete everything at any time.