claude.ai - 50M
- https://console.anthropic.com/workbench/
 - Developed by Anthropic
 - Powered by Anthropic’s own Claude model
 
chatgpt.com - 1,8B monthly visitors
- Developed by OpenAI
 - Powered by OpenAI’s own GPT model.
 - Information cut off in 2022 so the information might not be up-to-date.
 - Used by many startups to power their AI features.
 - https://platform.openai.com
 
gemini.google.com/app - 400M monthly visitors
- Developed by Google (aka Alphabet)
 - Powered by Google’s own Gemini model
 - Used to power a lot of Google products.
 
copilot.microsoft.com - 30M monthly visitors
- Developed by Microsoft
 - Powered by OpenAI’s GPT model.
 - Also can access URL links which can provide more up-to-date results.
 - Used to power Windows and copilot extension for VS code editor.
 
meta.ai - 25M monthly visitors
- Developed by Facebook (aka Meta)
 - Powered by Meta’s own LLAMA model
 - Used to power facebook and instagram websites and application
 
perplexity.ai - 60M
- https://labs.perplexity.ai/
 - Powered by a combination of Claude 3, GPT-4, and LLaMa 3.
 - AI powered search engine. Google+ChatGPT
 - Perplexity referral code for 50% off ($10 off)
 
- Powered by own Phind model
 - AI powered search engine. Google+ChatGPT
 
character.ai - 230M
blackbox.ai - 10M
https://poe.com/ - 50M
- Developed by Quora
 - Powered by a combination of different models.
 
- Subscription based chatbot with collection of various LLM models like Claude, GPT and Gemini
 
https://www.wolframalpha.com/ - 9M
- It is like ChatGPT for science
 
https://you.com/ - 10M
https://pi.ai/talk - 6M
https://v0.dev/ - 4M
jasper.ai - 4M
app.writesonic.com - 3M
All these chatbots can offer a pro subscription with a monthly fee. This will add some additional features or give access to API. With API access users can create their own custom functionality if needed.