Freemium
Perplexity AI
Perplexity AI is an AI search engine delivering real-time cited answers using GPT-4o and Claude 3.5. Free tier available, Pro at $20/month.
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Westlaw
Westlaw is an advanced legal research platform by Thomson Reuters that provides lawyers and legal professionals access to extensive legal databases, AI-powered search tools, citation checking, and legal analytics to support case preparation and legal writing.