Unlimited Sheets is a Google Spreadsheet add-on that adds advanced custom functions for your day to day needs. 
- No need to copy/paste different Google Spreadsheets templates for each new functionality you find
- The Add-on comes with custom functions to improve your day-to-day SEO operations & some extra utilities too

Some custom functions: Check if a value exist in a column, replace any string or substring, use the vertical lookup with 2 values or unlimited ones, extract monthly search volume, scrape HTML using regex, get related queries from a seed, calculate the traffic run rate for the current month of the next one and much more.