BullseyeCoverage vs Go cover

BullseyeCoverage measures C and C++ code coverage to help developers and testers locate untested code and assess testing completeness. It provides function coverage and condition/decision coverage, and results can be viewed interactively in Coverage Browser or generated as reports. Listed outputs include HTML, text, annotated source code, XML, Cobertura, and CSV. The tool instruments C and C++ source code and supports standard C++ versions from C++98 and C versions from C90 through current versions, plus compiler extensions. Coverage data can be exported in XML or CSV, and results from multiple computers can be merged. Supported tools include Visual Studio, Clang, GCC, Xcode, CMake, Eclipse, and embedded development tools such as Code Composer Studio. Supported environments include Windows, Linux desktop and server, macOS, and embedded systems. The company reports that instrumented execution takes 1.3–1.9× longer and code and data size increase to 1.4×; build-time effects vary by compiler. A temporary, fully functional evaluation license costs nothing and expires at the end of its evaluation period. The perpetual paid license has no listed price.

Go cover has no write-up on Specifiction yet; its figures are above.