Announcing the Azure Migrate application and code assessment tool for .NET

Announcing the Azure Migrate application and code assessment tool for .NET

We are happy to announce the release of a new tool that can assist you in migrating your on-premises .NET applications to Azure.

Azure Migrate application and code assessment tool for .NET (or AppCAT for short) allows you to assess .NET source code, configurations, and binaries of your application to identify potential issues and opportunities when migrating an app to Azure. It helps to discover any issues your application might have when it is ported to Azure and improve the performance, scalability, and security by suggesting modern, cloud-native solutions.

Screenshot of the Azure Migrate application and code assessment for .NET in Visual Studio

Once you run the analysis, the tool will show you a report of all possible things that you need to check or change to ensure your application works properly once it is moved from on-premises to Azure.

AppCAT discovers application technology usage through static code analysis of your code and its dependencies. It will also allow you to jump to a line that requires your attention, address issues and mark them as fixed, save the current state of the issues and the report so you or your coworkers can start exactly where you left off and effectively collaborate. The tool will give you an estimate of how much effort each issue will take to fix as well as giving estimates for the components of your apps and whole projects. And it will provide detailed guidance on how to fix the issues and connect you to the Microsoft documentation.

Screenshot of issues description in the Azure Migrate application and code assessment for .NET in Visual Studio

AppCAT is available in two “flavors” – as a Visual Studio extension and as a .NET CLI tool.

Install Visual Studio extension


  • Windows operating system

  • Visual Studio 2022 version 17.1 or later

Installation steps

Use the following steps to install it from inside Visual Studio. Alternatively, you can download and install the extension from the Visual Studio Marketplace.

  1. With Visual Studio open, press the Extensions > Manage Extensions menu item, which opens the Manage Extensions window.

    Screenshot of Visual Studio extensions

  2. In the Manage Extensions window, enter “Azure Migrate” into the search input box.

    Screenshot of the Azure Migrate application and code assessment for .NET vsix

  3. Select the Azure Migrate application and code assessment item, and then select Download.

  4. Once the extension has been downloaded, close Visual Studio. This starts the installation of the extension.

  5. In the VSIX Installer dialog select Modify and follow the directions to install the extension.

Install the CLI tool


  • .NET SDK

Installation steps

To install the tool, run the following command in a CLI:

dotnet tool install -g dotnet-appcat

To update the tool, run the following command in a CLI:

dotnet tool update -g dotnet-appcat

Note that installing this tool may fail if you’ve configured additional NuGet feed sources. Use the --ignore-failed-sources parameter to treat those failures as warnings instead of errors.

dotnet tool install -g --ignore-failed-sources dotnet-appcat

Analyze applications with Visual Studio

Once you have installed the Visual Studio extension, you are ready to analyze your application in Visual Studio. You can do so by right clicking on any of the projects or a solution in the Solution Explorer window and selecting Re-platform to Azure.

Screenshot of the Re-platform to Azure menu item in Visual Studio

The tool’s window will open offering you to either create a new report or open an existing reort.

Screenshot of the first AppCAT screen

If you are selecting to create a new report, on the next screen you can choose which projects in your solution you would like to analyze. Web projects will be pre-selected for you and you can change the selection by checking or unchecking the boxes next to the projects. When the tool runs, it also analyzes the dependencies your selected projects have.

Screenshot of the projects selection screen

On the next screen you can choose if youu want to analyze just your source code and settings or all binary dependencies that your code has as well.

Screenshot of the type of project components selection screen

Once you click Analyze button and the tool completes the analysis, you will see the results in a dashboard that can be saved in different formats (HTML, CSV and JSON).

Read this step by step guide for detailed instructions on the Visual Studio experience.

Analyze applications with .NET CLI

Once you installed the CLI tool, you are ready to analyze your application in CLI. In CLI run the command:

appcat analyze <APPLICATION_PATH>

You can specify a path and a format (.html, .json, or .csv) for the report file that the tool will produce:


appcat analyze <APPLICATION_PATH> --report MyAppReport --serializer html

Read this step by step guide for detailed instructions on the CLI experience.

Interpret results

Both CLI tool and Visual Studio allow you to save the results of the analysis in HTML, CSV and JSON formats. HTML report looks very similar to the dashboard you’ll see in the Visual Studio after the analysis is completed.

AppCAT report

The report will show you information about the number of projects analyzed, issues and incidents and an evaluation of how much effort each incident, issue and project take to be fixed. Incidents are grouped by categories and severity. There are different views that allow you to see the incidents, get help on how to fix them, jump to your code where those incidents occur and so on.

Aggregated issuees view

Read this Interpret the results guide for detailed description of the different parts of the reports and how to understand and interpret the data.

Supported languages

Application and code assessment for .NET can analyze projects written in the following languages:

  • C#

  • Visual Basic

Supported project types

It analyzes your code in the following project types:

Supported .NET frameworks

All .NET frameworks (.NET Framework, .NET Core, .NET 5+).

Supported Azure targets

Currently application identifies potential issues for migration to Azure App Service, AKS, and Azure Container Apps. In the future the tool might have an ability to set the target explicitly and filter the exact issues and recommendations for each target separately.

What’s next

Next, we are going to focus on infusing the tool with AI capabilities and adding integration with Copilot, so you can get help on overall migration as well as fixing particular issues.

Another big feature that we are currently working on is to get you a more curated assessment based on the Azure target you choose. We plan to add the ability to set the target before the report and build the report based on that target.

Useful materials

We have lots of materials to help you with your upgrade process: