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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
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Paperguide
✓ verifiedPaid
All-in-one research platform for reading, writing and managing papers; high traffic.
286K visits/mo4.1K saves
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ChatPDF
✓ verifiedFreemium
Popular tool to chat with PDFs and other documents, giving summaries and cited answers, with a free daily tier and no-signup start.
1.8M visits/mo43K saves
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Brainfish
✓ verifiedPaid
AI self-service support agents for B2B that resolve customer questions across chat, email, in-product and Slack.
9.1K visits/mo5.3K saves
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LightOn
✓ verifiedFreemium
Production RAG API for developers: parse, extract and search documents with SOTA OCR and cited retrieval, cloud or on-prem.
29K visits/mo
Pricing
Free: $0/month
Starter: $9/month
Advanced: $16/month
No public pricing
Free: $0
Pro: $35 / month
Team: $599 / month
Enterprise: Custom
No public pricing
Starter: Free + usage (parsing €0.002/page)
Business: €149/mo + usage (100 GB storage, unlimited users)
Free trial available
Core features
- ✦AI Search
- ✦Literature Review
- ✦AI Writer
- ✦Reference Manager
- ✦Chat with PDF
- ✦Chat with PDFs, Word, PowerPoint and text files
- ✦Summaries with cited sources
- ✦Multi-file chats via folders
- ✦Any-language upload and chat
- ✦Extra tools: AI writer, detector, flashcards, slides
- ✦No-signup quick start
- ✦Open-source AI knowledge base
- ✦AI-native research agent
- ✦Up to 70% reduction in document-digging time
- ✦REST API and SDKs for custom integrations
- ✦Image Grounding (embedding context from images & diagrams)
- ✦Deep Research (generating insights from thousands of documents)
- ✦Connectors for enterprise data integration
- ✦Visual-first Retrieval and Diagram Intelligence
- ✦Knowledge Graphs
- ✦Support for OSS & On-prem deployments
- ✦AI support agents across chat, email, in-product, Slack
- ✦Grounded answers with citations on every reply
- ✦Personalization by plan, role, region or account
- ✦Ingests docs, tickets, calls and knowledge bases
- ✦Evaluation analytics and gap detection
- ✦Enterprise security (SOC 2, ISO 27001, data residency)
- ✦Parse endpoint with SOTA OCR (LightOnOCR-2)
- ✦Extract endpoint for schema-based JSON
- ✦Search endpoint with hybrid retrieval and citations
- ✦MCP-native and LLM-agnostic
- ✦Workspaces and chunk-level access control
- ✦On-prem, VPC or air-gapped deployment
Use cases
- →Finding relevant research papers and getting research-backed answers.
- →Analyzing papers faster with accurate data extraction.
- →Generating and polishing academic content using AI.
- →Streamlining citation and reference management.
- →Understand research papers
- →Study and homework help
- →Review contracts and reports
- →Translate and summarize documents
- →Accelerating research for knowledge workers
- →Getting answers from research papers, reports, and company documents
- →Generating insights from large volumes of documents (1000s)
- →Performing search over complex diagrams, schematics, and datasheets
- →Building custom integrations with enterprise data
- →Deploying AI knowledge solutions in regulated industries or at massive scale
- →Proof-of-concept projects for individual developers
- →Automating B2B customer support
- →Deflecting repetitive support tickets
- →Powering internal team copilots
- →Surfacing upsells inside support chats
- →Build production RAG without a long in-house pipeline
- →OCR and structure scanned documents
- →Grounded document search with citations for agents
- →Deploy secure enterprise document intelligence
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