Open Source Code Review Tools For Net

Code reviews are an essential part of the software development process. They allow you to identify problems with your code before it is implemented, cutting down on time spent fixing bugs and freeing developers up to do the work they are most passionate about.

While the benefits of incorporating code reviews into your workflow may seem straightforward, the wide range of available code review tools can be overwhelming, and finding the right tool that suits your needs can prove challenging. Many code review tools provide similar functionality, yet the workflows and integrations they support can differ wildly. Faced with all these options, how can you identify the best review tool for your project?

Fortunately, we at JetBrains recently released the State of Developer Ecosystem 2021 report, which compiles the responses of over 31,000 developers to questions pertaining to different aspects of software development. Along with the latest trends in the tech industry, this research identifies the most-used code review tools of this year, and we’re happy to share the results with you.

What is a code review tool?

Code review is a quality assurance technique where the author of a piece of code asks another developer to look over it before it becomes part of the code base. The code review process can be as informal as having someone look over your shoulder while you explain your work to them, or it can be far more structured, with multiple rounds of documented feedback and quality gates that ensure code meets a certain standard before it can be merged.

Code review tools help development teams work together on code, and they ensure code quality and consistency. These tools can provide a clear structure for the reviews, integrating them into larger development workflows. They can also streamline communication between the parties involved, providing a record of the process and allowing participants to more easily track what needs to be done.

What kinds of code review tools are there?

Code review tools come in many forms. Here’s a quick overview of some of the key differences to take into account when looking for a tool that suits your needs.

  1. Bundled vs. standalone tool

Some code review tools are bundled into more comprehensive services or suites – such as GitHub, Azure DevOps, or JetBrains Space – while others are standalone resources. It’s important to take into account how integrated a solution can be with the resources you already have in place.

  1. VCS support

Even though Git is one of the predominant version control systems out there (93% of developers surveyed use Git), code review tools can be differentiated by the VCSs they support:

  • Git (the vast majority support Git)
  • Mercurial (Review Board, Crucible)
  • Apache Subversion (RhodeCode, Collaborator)
  1. Workflows

Code review tools support distinct development workflows, which may influence your ultimate choice:

  • Pull/Merge requests (GitHub, GitLab, BitBucket, Space)
  • Commits (Space)
  • Patches/Diffs (Gerrit, Phabricator)
  1. Automation features

Some code review tools can automate parts of the review process by providing static analysis or integration with CI/CD tools. Automating aspects of the process reduces the heavy lifting that is demanded of reviewers, which allows them to focus on providing helpful feedback without getting bogged down in minutiae. Here are some features that can simplify your code review process:

  • Code navigation (GitLab Code Intelligence)
  • Integration with CI/CD tools (Space)
  • Security checks
  • Detecting and fixing code issues (SonarQube, BitBucket)

The variety of features, integrations, and supported VCSs and workflows means that there is probably a tool out there that suits the needs of just about any team. Our list of the top code review tools in 2021 offers a great place to start your search for the one that’s best for you.

The best code review tools according to our State of Developer Ecosystem report

Best code review tools according to the State of Developer Ecosystem

1. GitHub

On GitHub, code review tools are built into pull requests. You can request reviews, propose changes, keep track of versions, and protect branches to improve the quality of your code.

Pricing: offers a free plan; paid plans start from $4 per user, per month.

2. GitLab

GitLab allows reviewing code, discussing changes, sharing knowledge, and identifying defects in code among distributed teams through asynchronous review and commenting. GitLab can automate, track, and report code reviews.

Pricing: offers a free plan; paid plans start from $19 per user, per month.

3. Bitbucket

Atlassian’s Bitbucket Code Review is a code-first interface that allows users to review large diffs, find bugs, collaborate, and merge pull requests.

Pricing: offers a free plan; paid plans start from $3 per user, per month.

4. Azure DevOps

Microsoft’s Azure DevOps code reviews are built into its Azure Repos and support a pull request review workflow. They offer threaded discussions and continuous integration.

Pricing: basic plan is free for teams of five, then $6 per month for each additional user.

5. Crucible

Atlassian’s Crucible is a lightweight code review tool that features threaded discussions and integrations with Jira Software and Bitbucket.

Pricing: one time payment of $10 for up to five users or $1,100 for larger teams.

6. Gerrit

Gerrit is an open-source tool for web-based code reviews, with Git-enabled SSH and HTTP servers. Built upon the Git VCS, Gerrit’s patch oriented review process supports the typical workflow of open-source projects.

Pricing: free to use.

7. Upsource

JetBrains Upsource offers post-commit code reviews, pull requests, and branch reviews, along with project analytics. Code insight features, such as static code analysis and code-aware navigation, allow you to automate significant portions of the code review process.

Price: no longer available.

Having developed Upsource as a standalone code review tool, we at JetBrains have been working on a more modern code review solution, taking into account the latest trends and best practices for code reviews and we’ve incorporated this solution into a larger platform for software teams. Our brand new JetBrains Space covers much Upsource’s core functionality and expands upon it, offering support for the complete software development pipeline.

8. JetBrains Space

JetBrains Space code reviews allow you to establish a customizable and integrated code review process with or without formal rules. Collaborate on code more easily, create merge requests, and protect your main branch with custom quality gates.

Space’s turn-based code reviews make the process of reviewing code crystal clear for both the author and the reviewer. You can review code in your branch before it’s merged to the main branch or after merging commits.

Space’s integration with JetBrains IDEs, such as IntelliJ IDEA, allows you to review and comment on code using the power of IDE navigation and manage your merge requests and code reviews without leaving your IDE.

Space is not limited to code reviews. It is a unified platform that covers the entire software development pipeline, from hosting Git repositories, automating CI/CD, publishing packages, and orchestrating cloud dev environments, to managing issues, documents, and chats – all in one place.

Pricing: offers a free plan; paid plans start from $8 per user, per month.

Space code reviews

9. Review Board

Review Board is an extensible tool that supports performing reviews on a variety of file types, including presentations, PDFs, and images, in addition to pure code review.

Pricing: paid plans start from $29 per 10 users, per month.

10. AWS Code Commit

AWS CodeCommit is a source control service that hosts private Git repositories and offers built-in support for pull requests. It is compatible with Git-based tools, making it easy to adopt without significant tooling or workflow adjustments.

Pricing: offers a free plan for up to five users; paid plans start from $1 per each additional user, per month.

11. Phabricator (deprecated)

Though Phabricator was among the code review software used in 2021, with 3% of Developer Ecosystem Survey respondents identifying it as the tool they used, it can no longer be adopted by new users. Phabricator has been deprecated as of June 1, 2021, and new instances cannot be created.

Price: no longer available.

12. Gogs/Gitea

Gitea and Gogs are open-source projects that aim to provide self-hosted Git services that are lightweight and easy to set up. Serving primarily, though not exclusively, Go users, these projects support a standard pull-request workflow for code reviews.

Pricing: free to use.

13. Collaborator

SmartBear’s Collaborator is a peer code and document review tool that integrates with a wide variety of IDEs and hosting services. It boasts a customizable workflow, allowing it to fit seamlessly into your pre-existing work processes.

Pricing: paid plans start from $529 per year for up to 25 users on five subscriptions.

14. Helix Swarm

Helix Swarm is a web-based code review tool for the Helix Core VCS. It integrates with the complete Perforce suite of tools, providing teams who use Helix Core with a range of resources for working collaboratively.

Pricing: free to use.

How to choose a code review tool

One of the most remarkable trends we found in our 2021 State of Developer Ecosystem Survey results is the popularity of code review tools built into larger ecosystems. Indeed, most respondents by far use code review resources that are included in more comprehensive solutions, such as GitHub or GitLab, or are integrated with larger suites, such as those offered by Atlassian or JetBrains. This suggests that many developers prioritize code review tools that conform to their pre-existing workflows and can be integrated seamlessly with solutions for other stages of the software development pipeline.

We asked our developers at JetBrains how they suggest choosing the code review tools, and here’s what they had to say:

“For me, the ability to have navigation is super useful, and usually saves me from having to clone the entire merge request just to review code.”

– Pasha Finkelshteyn, Developer Advocate, JetBrains

“This might sound obvious, but choosing the right tool really boils down to taking a close look at how your team and organization works. What are you reviewing? Who is reviewing? Who signs off on a code review? Pick a tool that is compatible with your development process, or one that can be customized enough to support your workflow.

Start with why. Why are you doing code reviews? To find bugs? To share implementation knowledge? To have a quality gate before merging to your main branch? Whatever the reason, the tool should closely fit your team’s “why”, and help with discussing code, support continuous integration hooks to automatically verify code, and more.”

– Maarten Balliauw, Developer Advocate, JetBrains

Why do people use custom code review tools?

Incorporating a new code review tool into your development process may seem less attractive if it requires you to completely adjust your workflow. Similarly, if you have to continually switch between tools in order to perform your code reviews, you may find that the benefits you enjoy from adopting them are offset by the time and focus you lose shifting contexts.

The need to find a tool that is compatible with pre-existing workflows may account for the surprising number of respondents who use a custom code review solution – 9% of software professionals admitted using a custom code review tool.

How can you improve your code review process using tools?

When looking for a solution to adopt, you may consider whether the tool you choose can automate parts of the code review process for you. Resources that provide static code analysis or code insight as part of code reviews, for example, can significantly reduce the reviewer’s cognitive load. This both speeds up the process and improves the quality of the final result.

Similarly, code review solutions that integrate with your IDE allow you to take advantage of the navigation and insight features you already rely on every day.

With its first-class JetBrains IDE integration, JetBrains Space allows you to review and comment on code using the power of IDE navigation. Using it, you can manage your merge requests and code reviews right inside your favorite IDE without having to change contexts.

As a unified platform for the complete software development pipeline, Space supports a variety of workflows and provides integrations with all of the services that are crucial for your development process, such as CI/CD and Git hosting.

Conclusion

Code reviews are a valuable technique for ensuring that your development process yields quality results, and your choice of a code review tool should not be taken lightly.

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