You may not be able to, or want to, determine coverage of your entire code base in a single test run due to target memory or effort constraints. Producing a combined coverage report by hand would be time-consuming and prone to error.
That's why RapiCover and RapiCoverZero let you merge data from different test runs automatically. By linking results to each coverage element in a copy of your code, RapiCover and RapiCoverZero can easily combine results from multiple result files. The Merge Coverage utility helps you configure options when merging coverage and highlights where you may need to review differences between code and/or tests in input reports.
This even works when you have applied different instrumentation in each test run or run your tests on different systems, for example host and target systems. For RapiCover, this feature is qualifiable for use in DO-178B/C projects. For more information, see here.
If you're using RapiCover and RapiCoverZero together, you can also automatically merge your coverage collected from object code and source code analysis.