- AppUp is a cloud-based, low-code IDE that helps you build apps in quickly. Its drag-and-drop interface helps you build full fledge functional apps. Unlike its competitors, it doesn't need to download any IDE framework in your machine. It works in the cloud where all your details can be safely and securely stored. AppUp is available just from $0.05 where you get 2 GB of storage. AppUp lets you build awesome apps without any prior knowledge of coding. It's a modern app builder that perfectly fulfills business requirements.