If you're looking for a ManyExcel alternative, Numerous.ai is a strong contender that brings ChatGPT to Google Sheets and Excel. It's designed to be easy to use with a lightweight syntax, supports team collaboration, and has several pricing tiers, including a free trial. That makes it a good choice for data classification, summarization and content generation.
Another contender is SheetAI, a Google Sheets add-on that automates repetitive work and offers new insights with AI functions. It includes features like SHEETAI_BRAIN for data storage, AI-generated lists and magic fills. SheetAI is free for basic use, so it's a good option for individuals and teams.
If you want a suite of AI tools, check out GPT Workspace. This tool combines ChatGPT and Gemini across Google Workspace, automating work in Google Sheets, Google Docs and more. It's got a free plan and a premium plan with more features, so it's good for a range of productivity needs.