Compare AI tools

	Grok A	NotebookLM S	GitHub Copilot B	Perplexity S
Tagline	xAI's chatbot. Real-time X/Twitter data + fewer refusals.	Google's research notebook. Turns your docs into a podcast.	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.	AI search done right. Cited answers, not chat theater.
Category	chat	research	coding	research
Pricing	Free + $30/mo SuperGrok + included with X Premium	Free	Free (limited) + $10/mo Pro + $19/mo Business	Free + $20/mo Pro
Best for	Breaking news, live event tracking, users already on X.	Students, researchers, anyone with a stack of PDFs or a topic to learn.	Teams with GitHub already. Devs who don't want to change IDEs.	Replacing Google for any question where you want a cited answer in seconds.
Strengths	Live access to X posts for real-time events Less restrictive on edgy questions Fast inference on Grok-3 and up	Upload anything, ask questions, get cited answers Audio Overview turns docs into a 10-min podcast Great for studying	Great enterprise story Works in your existing IDE Chat + autocomplete	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context
Weaknesses	Writing quality trails Claude/ChatGPT Political bias debates Ecosystem is just X	Google-only Can be slow on large corpora	Less agentic than Cursor/Claude Code Model quality varies	Not a general chatbot Answers can be shallow on complex topics
Kai's verdict	A-tier for real-time. B-tier for everything else. Worth checking when news breaks.	S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.	B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.	S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
Link	Open →	Open →	Open →	Open →