The Best Python, Java, C++, and C# Code Coverage Tools to Use in 2023

Code coverage is key in assuring a project is built with high-quality code—and it’s imperative to have the right tools for the job. In this article, we’ll go over 12 of the best code coverage tools to use for your next project.

Because of the variety of tools available for each language, we’ll cover some of the best tools for four popular languages: Java, Python, C++, and C#.

🐍 Code coverage tools for Python

1. Coverage.Py

First developed way back in 2004, Coverage.Py is a popular tool that works out of the box using Python’s standard library and can be installed using pip. Its key feature is its ability to cover every line of code and notify users which lines of code have been executed.

Price: Free

2. DeepSource

DeepSource offers a premium code coverage platform designed to work with all CI environments. It has built-in coverage metrics (line, branch, condition, etc.) and shows the exact lines of code in pull requests that are without tests. This tool stands out for its focus on identifying precise issues in code, as opposed to a strict focus on just the percentage of code covered.

Price: Quickstart trial or request a demo

3. CodeCov

CodeCov is an all-in-one code coverage reporting tool designed for any test suite. Developers are able to see all of their coverage analytics and have total control without the disruption of their workflow. One of CodeCov’s main focuses is to reduce time spent on running tests by focusing attention on relevant insights.

Price: Open Source (Free), Basic (Free), Pro ($10/user/month), Enterprise (schedule a call for more details)

☕️ Code coverage tools for Java

4. OpenClover

OpenClover is a Java code coverage tool that offers over 20 built-in metrics and a ton of integrations, including Ant, Maven, and Grails. This tool is designed to run tests fast while delivering detailed insights on application code.

Price: Free

5. Cobertura

An open-source coverage tool, Cobertura allows developers to find which parts of their code are lacking test coverage and measure coverage-absent source code. This tool also works well with the Maven and Eclipse plugins.

Price: Free

6. JaCoCo

Short for Java Code Coverage, JaCoCo is a tool that works well with the Eclipse IDE. JaCoCo can tell developers exactly where code coverage is lacking, making it much easier to focus on the code that needs testing. In addition to plugins like Maven and Jenkins, developers using this tool can create custom plugins as well.

Price: Free

👉 Code coverage tools for C++

7. Testwell CTC

One of the oldest coverage tools on the market is Testwell CTC++. This tool is still being supported after 25 years of continuous development.

Price: For information on pricing and how to purchase a license for this tool, check here.

8. SquishCoCo

Similar to JaCoCo, Squish is the C++ testing suite version of CoCo. Squish is designed to be used at every stage of testing and can merge several different execution reports into one. This tool helps developers optimize manual tests, find redundancies in code, and find dead and unexecuted code. SquishCoCo is a premium tool and requires the purchase of a license to use.

Price: 3.000€ per 5 user per language

9. Bullseye

Bullseye is a code coverage tool developed specifically for enterprise applications. Bullseye is designed to be simple to use, with support for a multitude of work environments and an ability to integrate seamlessly into any workflow. This tool provides detailed metrics in an easy-to-understand format, making its use versatile across many industries.

Price: Bullseye license purchase is on an “Evaluation” basis—learn more here.

➡️ Code coverage tools for C#

10. dotCover

dotCover is the premiere unit testing tool for C# developers. dotCover integrates seamlessly with Visual Studio and offers developers coverage highlights, coverage analysis, and node filtering.

Price: 30-day free trial with an option to upgrade to premium starting at $469 a year.

11. OpenCover

Yet another popular open-source tool, OpenCover is a powerful code coverage tool. This tool integrates with Visual Studio, working exclusively for the Windows OS. OC gives devs a high level of control over their testing process, making it one of the most unique coverage tools on the market. Despite its popularity with developers OpenCover is no longer supported by its author.

Price: Free

12. NCover

NCover is a coverage tool designed for both individual developers and teams. The key feature of this tool is its data centralization, which allows developers and teams to see everything in one place.

Price: $658 for one-year desktop license, $2,298 for one-year code central license. Licensing options can be purchased here.

Choose the right tools for your next project 🚀

Code coverage is the key to making sure your application works the way it's supposed to before launch. A proper code coverage tool will make sure testing goes smoothly, something every single one of the tools we listed above will help you achieve. Hopefully, we’ve helped you discover which tool would best suit your development needs.

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