Microsoft CopilotMicrosoft Copilot is an AI assistant for questions, writing and everyday information tasks.
PerplexityPerplexity is an AI search and research service that presents responses alongside source references.
Meta AIMeta AI is Meta's assistant for conversational answers, research, writing, and image creation.
Gemini NotebookGemini Notebook is Google's source-based research and learning assistant, previously known as NotebookLM.