Tools · Comparison

Connected Papers vs Perplexity AI vs SciSpace

All three are research tools. Here is what separates them.

	Connected Papers	Perplexity AI	SciSpace
What it is	A unique, visual tool to help researchers and applied scientists find and explore papers relevant to their field of work.	AI-powered search engine providing accurate, sourced answers using LLMs and real-time web search.	Explains a paper while you read it — highlight a passage and ask what it means.
Category	Research	Research	Research
Pricing	Paid	Freemium · $20/mo	Freemium · Free · from $12/mo
How it bills	Not published	Flat monthly	Flat monthly
Free tier	No	Yes	Yes
Rating	Not yet rated	4.6 from 5,400 reviews	Not yet rated
Features	—	Real-time web search Cited sources Pro Search deep research File analysis Image search Code execution Collections API access	Explains highlighted passages in context Handles equations and notation Literature search Paper comparison tables Citation export
What works	Sits in Research, one of the better-covered categories here — easy to compare	Accurate with citations Real-time information Excellent for research Clean interface Generous free tier	Excellent for reading outside your field Context-aware rather than generic Reasonable free tier
What does not	No free tier — it has to be paid for before it can be tried Does not publish a price on its own site, so the cost is only clear after signing up 44 other tools in this catalogue claim to do the same job 12 tools in the same category have a free tier	Pro features behind paywall Sometimes shallow answers Limited creative tasks Fewer integrations	Explanations can be confidently wrong Search is weaker than dedicated tools Interface is cluttered

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