Report Toaster: Custom Reports

I've been a Shopify customer for 15 years and I have purchased and installed quite a lot of apps. Report Toaster is probably the most useful app I've ever used. You can ask it just about anything about your store. I use it mostly for Sales and Use Tax reports and inventory. It tells me about sales for each month for tax filings and you can ask it for the number of sales for any period for any product in your store. It's absolutely AWESOME!