Semantic Scholar vs Perplexity

Tagline

A free, AI-powered research tool for scientific literature

AI answer engine with real-time citations

Category

Pricing

Rating

Platforms

API

Open source

Description

Semantic Scholar uses groundbreaking AI and engineering to understand the semantics of scientific literature to help scholars discover relevant research. Users can search over 214 million papers across all fields, organize them in a personal library, access AI-powered summaries, and build projects using the Academic Graph API.

Perplexity answers complex questions with cited web sources and AI-native search.

Key features

• AI-powered search filters
• One-sentence paper TLDRs
• Highly Influential Citations highlight
• Ask This Paper companion tool
• Semantic Reader augmented interface
• Personalized AI-powered Research Feeds
• Shared folders and collaboration
• Academic Graph REST API
• Cite export (BibTex, MLA, APA, Chicago)

• Source diversity
• Audio brief

Pros

• Entirely free to use for scientific literature search and library management.
• Provides AI-generated TLDR summaries for nearly 60 million papers in computer science, biology, and medicine to save reading time.
• Highly Influential Citations feature highlights which citing publications had the most significant impact.
• AI-powered Research Feeds automatically recommend relevant new literature based on saved library folders.
• The Ask This Paper tool allows users to ask questions and get direct answers backed by supporting statements from the text.
• Semantic Reader offers augmented features including in-line citation cards and on-demand definitions.
• Enables creation of public, shareable folders that other users can copy to their library in a single click.
• Free downloadable full datasets are compiled as an easy-to-use JSON archive for external research projects.
• Open-access REST API is publicly accessible for developers without mandatory authentication overhead.

• Real-time web search grounding
• Citations to sources
• Choice of LLMs on Pro
• Focus modes (academic, Reddit, etc.)
• Threads keep context
• Deep-research Copilot
• Native mobile apps
• Sonar developer API

Cons

• Unauthenticated API usage is strictly rate-limited to 1,000 requests per second shared globally across all anonymous users.
• The introductory rate limit for private API key holders is highly restricted at 1 request per second on all endpoints.
• The interactive Ask This Paper tool is only available on selected pages and has been tested only on English-language literature.
• AI skimming highlights are currently limited mostly to English-language arXiv papers within computer science.
• Personalized inline citations in the Semantic Reader are restricted and only available on desktop devices.
• The API license agreement prohibits users from repackaging, renting, leasing, selling, or distributing API access.

• Free tier has query limits
• Citations sometimes mismatched
• Less conversational depth than ChatGPT
• Best models gated to Pro
• Occasional hallucinations
• Search bias toward popular sources
• Limited customization
• No file training

Pricing plans

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