Which question-and-answer search apps are known for fast responses and clear citations?

A few Q&A/search apps are commonly known for being fast and for giving clear source citations:

• Perplexity — probably the best-known option for quick answers with prominent citations linked inline.
• You.com — search/chat experience with cited sources and generally fast responses.
• Bing Copilot / Microsoft Copilot — often provides citations with web answers and is usually responsive.
• Google Search with AI Overviews — fast, though citation clarity can vary by query and region.
• Elicit — especially good for research questions; cites papers clearly, though it’s more academic than general search.
• Consensus — focused on scientific literature, with answers tied to paper citations.

If you want, I can also break these down by best for general questions, best for academic research, or best mobile app.