Compare AI tools

	Perplexity S	NotebookLM S	Devin A	Fathom S
Tagline	AI search done right. Cited answers, not chat theater.	Google's research notebook. Turns your docs into a podcast.	Cognition Labs' autonomous coding engineer.	Meeting notes, free forever for individuals.
Category	Research	Research	Agents	Meetings
Pricing	Free + $20/mo Pro	Free	$500/mo	Free for individuals + $15-$29/user/mo teams
Best for	Replacing Google for any question where you want a cited answer in seconds.	Students, researchers, anyone with a stack of PDFs or a topic to learn.	Engineering teams offloading tickets. Ops/platform work.	Solo operators, freelancers, small teams on a budget.
Strengths	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context	Upload anything, ask questions, get cited answers Audio Overview turns docs into a 10-min podcast Great for studying	Works like an engineer — takes Slack tasks, opens PRs Handles multi-hour engineering work Reports back with what it did	Unlimited free tier for solo use Strong summaries + action items Works in Zoom, Meet, Teams
Weaknesses	Not a general chatbot Answers can be shallow on complex topics	Google-only Can be slow on large corpora	Expensive Best for well-scoped tasks Not for solo hobbyists	Bot-joining model Team features gated
Kai's verdict	S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.	S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.	A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.	S-tier for solo + free. The best free option, hands down.
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