ChatGPT
chatgpt.com
The general assistant most people mean when they say they used AI
Free tier
Loading page
chatgpt.com
The general assistant most people mean when they say they used AI
gemini.google.com
Google's assistant, wired into Search, Gmail, Drive and YouTube
datasetsearch.research.google.com
Finds published datasets across repositories, governments and journals
notebooklm.google.com
Summarises only the sources you upload, and cites the exact passage
ourworldindata.org
Long-run global data on health, energy and poverty, free to reuse
perplexity.ai
Answers a question by searching the web and footnoting every claim
pubmed.ncbi.nlm.nih.gov
The index of record for biomedical literature, run by the US National Library of Medicine
wikipedia.org
Gets you oriented on almost any subject, with the sources listed at the bottom
Cuts across
A tag is orthogonal to the category tree — that is what makes it worth having.