Tools · Comparison

Alethea vs Knowly vs Perplexity AI

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

	Alethea	Knowly	Perplexity AI
What it is	ALETHIA AI is a research and development studio building at the intersection of two of the most transformative technologies of our time: Generative AI and…	Everyone is building AI to execute work. Knowly is building AI to grow the brain itself — a proactive second brain that guides your whole learning journey and turns what you save into understanding that stays.	AI-powered search engine providing accurate, sourced answers using LLMs and real-time web search.
Category	Research	Research	Research
Pricing	Paid	Freemium	Freemium · $20/mo
How it bills	Not published	Not published	Flat monthly
Free tier	No	Yes	Yes
Rating	Not yet rated	Not yet rated	4.6 from 5,400 reviews
Features	—	—	Real-time web search Cited sources Pro Search deep research File analysis Image search Code execution Collections API access
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
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