The following software development tools are usually used to develop apps:

1. Comprehensive cross-platform development tools, such as ReactNative, Flutter, Xamarin, etc. These tools allow developers to build applications for multiple platforms (such as iOS and Android) at the same time with one set of code, reducing development time and cost.

2. native development tools: for the application development of a specific platform, you can use their native development tools. For example, for iOS applications, Xcode and Objective-C or Swift programming languages can be used; For Android applications, AndroidStudio and Java or Kotlin programming languages can be used.

3. mixed development tools: such as Ionic, PhoneGap, etc. These tools allow developers to use Web technologies (HTML, CSS, JavaScript) to build applications and package them into native applications. Although they usually cannot provide the same performance and user experience as native applications, they are a convenient choice for simple applications or rapid prototyping.

4. Back-end development tools: If the App needs to interact with the server or deal with a lot of business logic, developers may need to use back-end development tools. Common back-end development languages and frameworks include Node.js, Django, RubyonRails, etc.

in addition to the above tools, there are other auxiliary tools and frameworks that can be used for application development, such as version control tools (such as Git), integrated development environments (such as VisualStudioCode and Eclipse), and testing tools and frameworks.

according to the needs, skills and project requirements of developers, it is very important to choose the appropriate development tools. Sometimes, developers may combine multiple tools and technologies to achieve more complex and efficient App development.

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