OpenRewrite vs ReSharper

OpenRewrite is an open-source ecosystem for automated code refactoring, aimed at updating code and reducing technical debt. It represents code as Lossless Semantic Trees, applies transformations, and prints the result back into source code for review. Its recipes cover framework migrations, security fixes, and style consistency, and can be written in YAML, Refaster templates, or Java. Maven and Gradle plugins run recipes locally as part of builds, one repository at a time. The Maven plugin offers a dry run that reports potential changes and writes diff files; recipes run only when explicitly activated by name. Documented support includes Java, Kotlin, and Groovy, plus formats such as HCL, JSON, Properties, Protobuf, TOML, XML, and YAML. Framework coverage includes Spring, Quarkus, and Micronaut. The recipe index lists 4,183 recipes across modules. Core and language libraries use Apache License 2.0, but some recipes have other licensing terms. Core is free; some artifacts require authenticated repository access, and some recipes require a Moderne subscription.

ReSharper provides coding assistance and code quality tools for.NET development. It analyzes C#, VB.NET, XAML, ASP.NET, HTML, and XML as code is written. Editing features include extended IntelliSense, transformations, namespace imports, code rearrangement, and documentation display. Developers can generate properties, overloads, implementations, and comparers, then apply refactorings across a solution or to smaller sections. Navigation helps move among files, types, and members, and follow symbols to usages, base or derived symbols, and implementations. Other tools include a unit test runner, code templates, debugging assistance, project dependency viewing, and internationalization assistance. The VS Code edition also works with Cursor, Antigravity IDE, Devin Desktop, Kiro IDE, and compatible editors. It runs on Windows, macOS, and Linux on x64 and ARM64, including Apple silicon on macOS, and requires a.NET SDK version 6.0 or later on PATH. A 30-day trial starts after installation. Afterward, use requires a commercial license or a free non-commercial license. The commercial plan costs $389 a year per user.