How this helps
Free shipping can be useful, but only when the extra item makes sense. If you need to spend $18 more to avoid a $6 shipping fee, paying shipping may be cheaper. If you only need $4 more to avoid $8 shipping, adding a useful item may be better.
Example
Your cart is $42, free shipping starts at $50, and shipping costs $7. You need $8 more for free shipping. If you can add an item you actually need for $8, your total becomes $50 instead of $49 with shipping. In that case, adding the item may be worth it.
Useful for these categories
This tool is helpful when shopping Beauty & Personal Care, Baby, Kids & Family, Pets, Fashion & Apparel, and Home & Garden because many stores use free shipping thresholds.