SMS Popup is described as 'A simple app that shows a popup dialog when an SMS is received (similar to the iPhone) but also includes their contact photo' and is an app in the Social & Communications category. There are three alternatives to SMS Popup for Android, Android Wear, Online / Web-based and SaaS. The best alternative is Handcent SMS, which is free. Other great apps like SMS Popup are TalkSMS (Free) and CartBoss (Paid).
What is TalkSMS? TalkSMS is a service which allows you to send SMS from the web to people worldwide. The price per message remains the same regardless of where in the world you send messages to. Messages you send will have your phone number as the sender.
CartBoss recovers abandoned carts, reduces dead stock, and improves customer LTV - on autopilot. The text messages are already prepared and translated, the integration process takes 5-minutes and language detection is automatic.