# Apps

- [Task #26: Loox or Judge.me Product Reviews](/ecom-foundations/apps/task-26.md): Optimize your site with Loox for Shopify: installation, pricing, integration, and review management.
- [Task #27: Klaviyo](/ecom-foundations/apps/task-27.md): Increase sales in Shopify with Klaviyo: bring back warm customers and boost profits for free.
- [Task #28: Tracktor By ShopPad](/ecom-foundations/apps/task-28.md): Set up order tracking in Shopify: automatic notifications about the order status sent to the customer's email.
- [Task #29: Buy Me ‑ Sticky Buy Button](/ecom-foundations/apps/task-29.md): Add a fixed "Add to Cart" button on the product page using the Buy Me - Sticky Buy Button app in Shopify.