Determining the "best" online shopping app can depend on various factors such as personal preferences, specific needs, and the region you're in. However, some popular and widely regarded online shopping apps globally include:

  1. Amazon: Known for its vast selection of products, quick delivery, and reliable customer service.
  2. eBay: Offers a wide range of products, including both new and used items, often at competitive prices.
  3. AliExpress: Particularly popular for its extensive range of products at affordable prices, often directly from manufacturers in China.
  4. Walmart: Offers a mix of products, including groceries, electronics, home goods, and more, with options for in-store pickup.
  5. Etsy: Specializes in handmade, vintage, and unique items, making it a great platform for finding one-of-a-kind products.

Ultimately, the best app for you will depend on what you're looking to buy, your budget, and your location. It's a good idea to explore several apps to see which one aligns best with your shopping preferences.