Question: Is there a plugin that allows me to summarize and categorize large datasets using AI, without requiring API keys?

If you're looking for a plugin to summarize and categorize large data sets with AI without needing API keys, Numerous.ai is a good choice. The plugin brings ChatGPT abilities to Google Sheets and Excel, and it's easy to set up and use. It can handle tasks like summarization and categorization, and is good for research, digital marketing campaigns and team collaboration. With several pricing tiers, including a free trial, it's available to individuals and teams.

Another tool worth considering is Neptyne. It marries Python programming code with Google Sheets to run more advanced data processing jobs, including summarization, refinement and classification with AI models. It also can import data from a variety of sources and visualize it, so it can be useful for a variety of practical purposes. Neptyne offers a free tier, so it can be a cheap way to get started.

Morph is another option. The AI-powered data assistant makes data easier to manage by analyzing data from multiple sources and exporting results without any programming. It can query, visualize and report data, and connect to many SQL databases. With a free plan and a Pro plan with more features, Morph is good for businesses trying to automate their data analysis processes.