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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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Prolific
✓ verifiedPaid
Research participant marketplace that gives AI teams and academics fast access to verified, screened human data and feedback.
21M visits/mo
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Semantic Scholar
✓ verifiedFree
Free AI-powered academic search engine indexing 236M+ papers, for researchers wanting semantic literature discovery and an augmented reader.
7.9M visits/mo13K saves
Pricing
Free: $0/month
Premium: $19.99/month
Enterprise: Let's talk
No public pricing
No public pricing
Core features
- ✦AI Writing Assistant
- ✦AI Email Generator
- ✦Outline Generator
- ✦Title and Abstract Generator
- ✦AI Copilot for Research
- ✦Citation Support
- ✦AI-Powered Autocompletion
- ✦Document Chatting
- ✦300,000+ verified, screened participants
- ✦300+ audience targeting filters
- ✦Representative and quota-based sampling
- ✦API and no-code survey tool integrations
- ✦AI-powered participant quality monitoring (Protocol)
- ✦Managed services with dedicated project teams
- ✦Access to vetted domain experts
- ✦AI-powered semantic search across 236M+ papers
- ✦Semantic Reader for augmented, contextual paper reading
- ✦Free public API for paper search and metadata
- ✦Author and topic discovery
- ✦Citation graph exploration
- ✦Beta program for new features
Use cases
- →Generating professional emails
- →Writing and editing academic papers
- →Creating research outlines
- →Summarizing research papers
- →Improving writing quality with paraphrasing and rewriting tools
- →Chatting with PDF files and website URLs for information extraction
- →Collecting human preference data for RLHF or model evaluation
- →Running academic behavioral or market research studies
- →Sourcing domain-expert data for specialized AI benchmarks
- →Researchers searching scientific literature across disciplines
- →Developers building applications on top of scholarly data via the API
- →Students exploring citation networks for a topic
- →Librarians and academics needing free literature discovery tools
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