Shortlist by what you need
Start here if you know why you are leaving ChatPDF.
Want the closest match?
ZendyMost similar to ChatPDF in what it does, its category and its price.
Visit (opens Zendy in a new tab)Need a free plan?
Connected PapersHas a free plan, rated 4.5 out of 5.
Visit (opens Connected Papers in a new tab)Want to pay less than ChatPDF?
HumataFrom $1/mo, against from $5/mo for ChatPDF.
Visit (opens Humata in a new tab)Want the best rated?
AnaraRated 4.3 out of 5 in our review, against 4.4 for ChatPDF.
Visit (opens Anara in a new tab)
At a glance
Green means better than ChatPDF, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 ChatPDFBaseline | 4.4 | $5/mo | Yes | One of the original chat-with-your-PDF tools, still deliberately minimal | |
| Zendy | 4.1−0.3 | Free | Yes | Accessible, mission-driven access to journals, not a document-upload tool | vs ChatPDF |
 Petal | 4.2−0.2 | $4/mo$1 less | Yes | MIT-founded document platform with a free reference-manager component | vs ChatPDF |
| Humata | 4.3−0.1 | $1/mo$4 less | Yes | Per-page pricing for chatting with large documents beyond academic papers | vs ChatPDF |
 AskYourPDF | 4.2−0.2 | $11/mo$6 more | Yes | Auto-fills PDF forms and ships a developer API, not just chat | vs ChatPDF |
| Connected Papers | 4.5+0.1 | $5/moSame price | Yes | A visual citation graph, not another chat-with-papers tool | vs ChatPDF |
| Anara | 4.3−0.1 | $10/mo$5 more | Yes | Extracts PDF tables into structured, typed data schemas | vs ChatPDF |
 OpenRead | 3.5−0.9 | Free | Yes | Ask a research paper a question and Oat, the AI assistant, answers directly from its content - plus rapid paper summarization and visual mapping of related work, updated every 5 minutes. | vs ChatPDF |
 OmniBox | 3.9−0.5 | Free | Yes | Open-source knowledge capture that traces every answer back to the source. | vs ChatPDF |
The alternatives in detail
In order of how closely each one matches ChatPDF.
Zendy
4.1Free
vs ChatPDF−0.3
Accessible, mission-driven access to journals, not a document-upload tool.
- Unlimited access to a large licensed library of journals and articles
- Priced around the cost of a single research paper
- ZAIA AI assistant answering questions from within the library
Addresses literature-access cost directly, not just document processing
Expanded access requires a Zendy Plus subscription
Petal
4.2$4/mo
vs ChatPDF$1 less−0.2
MIT-founded document platform with a free reference-manager component.
- Chat interface across a shared, uploaded document library
- Petal CITE, a free cloud-native reference manager
- Founded in 2018 by MIT graduate researchers
Petal CITE provides genuinely free reference management, not just a limited trial
More features require a paid plan
Humata
4.3$1/mo
vs ChatPDF$4 less−0.1
Per-page pricing for chatting with large documents beyond academic papers.
- Chat interface for large, long-form documents beyond academic papers
- Per-page pricing model scaling with document volume
- Positioned for contracts, patents, and financial filings
Broader document scope than tools focused narrowly on academic papers
Per-page pricing can cost more than a flat tier for steady, high-volume use
AskYourPDF
4.2$11/mo
vs ChatPDF$6 more−0.2
Auto-fills PDF forms and ships a developer API, not just chat.
- AI-powered automatic PDF form filling
- Full developer API with documentation
- Website-embeddable AI agent trained on uploaded documents
Form-filling addresses a genuinely different task than plain document chat
Broader feature set adds more surface area to learn than a single-purpose chat tool
Connected Papers
4.5$5/mo
vs ChatPDFSame price+0.1
A visual citation graph, not another chat-with-papers tool.
- Visual graph of papers connected by shared citations
- Discovery-focused rather than question-answering-focused
- Free tier for standard use
Genuinely different mechanism from the chat-based tools dominating this category
Does not answer questions about a paper's actual content
Anara
4.3$10/mo
vs ChatPDF$5 more−0.1
Extracts PDF tables into structured, typed data schemas.
- Typed schema extraction of tables and structured data from PDFs
- Library connections to Zotero, Mendeley, Notion, Google Drive, PubMed, arXiv, and JSTOR
- Grounded, clickable citations tied to source passages
Structured data extraction goes beyond prose-only answers
Five-tier pricing structure takes more comparison to find the right plan
OpenRead
3.5Free
vs ChatPDF−0.9
Ask a research paper a question and Oat, the AI assistant, answers directly from its content - plus rapid paper summarization and visual mapping of related work, updated every 5 minutes.
- Paper Espresso - rapid AI summarization of key points
- Paper Q&A grounded directly in a document's own content
- Oat AI Assistant for interactive research Q&A
Answers grounded in a specific paper's actual content, not generalized training knowledge
Free tier caps monthly AI feature uses, not just uploads
OmniBox
3.9Free
vs ChatPDF−0.5
Open-source knowledge capture that traces every answer back to the source.
- Browser extension snapshotting pages into editable documents
- PDF, Word, PowerPoint, Markdown, audio and video parsing
- Question answering with answers traced to source
Open source, so a years-long personal archive is not vendor-locked
Mobile apps, tags and subscriptions are all still unreleased
FAQ
Questions people ask
Is ChatPDF free?
ChatPDF has a free plan, and paid plans start from $5/mo.
What is the best free alternative to ChatPDF?
Connected Papers is the highest-rated alternative here with a free plan (4.5 out of 5). Other free options: Humata, Anara, Petal.
What is the cheapest alternative to ChatPDF?
Among paid plans, Humata has the lowest starting price (from $1/mo). If you need it free, start with Connected Papers.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.