Perplexity
AI search engine with cited answers and deep research
Free · from $20/mo
Web · macOS · Windows · iOS · Android
Models: Sonar, GPT, Claude, Gemini, Grok
Research
Web and app
ChatGPT deep research
ChatGPT mode that researches the web and writes cited reports
Free · from $8/mo
Web · macOS · Windows · iOS · Android
Models: GPT
Gemini Deep Research
Gemini agent that researches web, Gmail and Drive into reports
Free · from $4.99/mo
Web · macOS · Windows · iOS · Android
Models: Gemini
Gemini Notebook
Formerly NotebookLM: answers and summarizes from your own sources
Free · from $4.99/mo
Web · iOS · Android
Models: Gemini
Elicit
Searches and summarizes papers, automates systematic reviews
Free · from $49/mo
Web
Models: Claude
Consensus
Search engine for scientific papers that synthesizes evidence
Free · from $20/mo
Web · Android
Models: GPT
Kagi Assistant
Kagi assistant with web search and models from many providers
from $5/mo
Web · iOS · Android
Models: Claude, GPT, Gemini, Mistral, Qwen, DeepSeek, Grok, Kimi
Price: cheapest individual plan, USD per month. Checked: Sep 27, 2026. Source: each tool's pricing page.