The free and open source karaoke singing game UltraStar Deluxe, inspired by Sony SingStar™
C-Rank Grade: A (Welcoming) - 65/100
External PR Merge Rate: 56%
Response Time: 4h
First Timer Success: 100%
UltraStar-Deluxe/USDX has a recorded first-timer success rate of 100.0%. Repositories ranked A typically provide actionable feedback during code reviews and actively nurture new community contributors.
Maintainers in UltraStar-Deluxe/USDX respond to incoming external pull requests in approximately 4.2 hours on average. Keeping PRs focused on single tasks and ensuring tests pass helps maintainers review faster.
The C-Rank™ system evaluates GitHub projects on a 0–100 scale using real data: PR merge rates, review turnaround time, active maintainer presence, and first-time contributor success. A score of 65.4 places UltraStar-Deluxe/USDX in the A tier.
The external contributor pull request merge rate for UltraStar-Deluxe/USDX is 55.6%, based on public PR activity from non-core contributors.
UltraStar-Deluxe/USDX currently has 1 active issue(s) tagged with beginner-friendly labels like "good first issue", "beginner", or "up-for-grabs".
Active maintainer team in UltraStar-Deluxe/USDX welcoming community pull requests and bug fixes.
Average Response Latency
Tracks hours until a maintainer leaves a review, comment, or PR response.
External Acceptance Rate
Percentage of community pull requests successfully merged into main.
First PR Conversion
Rate at which developers submitting their first repository PR succeed.
Show contributors that your repository actively reviews and merges external pull requests.
[](https://getmerged.abhishekco.de/UltraStar-Deluxe/USDX?utm_source=github&utm_medium=badge)
Historical health & responsiveness evolution
External PR acceptance
First PR success rate
50% receive response in
90% receive response in
Maintainer review activity heatmap & prime window prediction
Calculating local time...
Calculating local time...
Detected: UTC
Maintainers are most responsive around 13:00 UTC (13:00 UTC in your timezone). Recommended submission window is Monday - Wednesday from 12:00 to 16:00 UTC (12:00 - 16:00 UTC local).
Maintainer Strategy: Maintainer Sweet Spot: PRs under 150 lines merge in ~4 hours (69% approval). Large PRs (>500 lines) take ~20 hours (25% approval). Keep your diff compact for rapid review.
OpenCV 5 was recently released, the first major release in 8 years. The project published a migration guide here. I self-compiled the 5.0 release on my Linux PC to test if USDX is compatible with it. The configure script was able to find my self-compiled OpenCV 5.0 libraries, the C wrapper library compiled without issue, and the game seems to run fine with it. So that is good news. However, the configure.ac still needs some updates to provide proper support for OpenCV 5. The C++ compiler now needs to support the C++17 standard instead of C++11. The configure.ac needs to detect if OpenCV 4.x or 5.x is installed, and check for the correct C++ standard depending on version. It currently checks for C++11 only. The Linux AppImage will be blocked from upgrading to OpenCV 5 unless we upgrade the OS that builds it. Due to the C++17 requirement, OpenCV 5.0 needs GCC 8, but only GCC 4 is available. The pkg-config file name for 5.x is now opencv5.pc. The fallback pkg-config detection method in co
Rate what actually matters after opening a pull request here.
Rate your first-hand PR experience (review speed, maintainer responsiveness, and onboarding ease) to help other contributors.
When evaluating whether to contribute to UltraStar-Deluxe/USDX, response velocity and maintainer engagement are crucial. GetMerged continuously tracks pull request trajectories, first-comment latency, and code review rounds to help developers avoid submitting pull requests to backlogged repositories.
Currently, maintainers of UltraStar-Deluxe/USDX acknowledge new external contributions in approximately 4 hours. Out of all submitted pull requests from non-core authors in the last 180-day window, 55.6% were successfully merged into the primary branch.
UltraStar-Deluxe/USDX has a recorded first-timer success rate of 100.0%. Repositories ranked Welcoming typically provide actionable feedback during code reviews and actively nurture new community contributors.
The initial maintainer response time averages ~4 hours. Keeping PRs scoped to single concerns and ensuring CI checks succeed will optimize review turnaround.
The C-Rank™ index scores repositories on a 0 to 100 scale using an objective formula: external PR merge rates, initial response speed, active maintainer count, and first-time contributor retention. A score of 65.4 places UltraStar-Deluxe/USDX in the Welcoming tier.
The external pull request merge rate is 55.6%. GetMerged isolates non-core community contributions so external developers get an accurate benchmark of PR acceptance probability.
Yes, UltraStar-Deluxe/USDX currently has 1 active issue(s) tagged with beginner-friendly labels. You can inspect these directly from the repository issues tab.
All metrics displayed for UltraStar-Deluxe/USDX are automatically retrieved via the public GitHub API and recalculated daily. Insider pull requests submitted by repository owners or organization members are excluded from merge rate calculations to preserve objective external contributor statistics.