Unstyled UI components for building accessible web apps and design systems. From the creators of Radix, Floating UI, and Material UI.
C-Rank Grade: A (Welcoming) - 65/100
External PR Merge Rate: 71%
Response Time: -
First Timer Success: 70%
mui/base-ui has a recorded first-timer success rate of 70.0%. Repositories ranked A typically provide actionable feedback during code reviews and actively nurture new community contributors.
Maintainers in mui/base-ui respond to incoming external pull requests in approximately 0.0 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 64.7 places mui/base-ui in the A tier.
The external contributor pull request merge rate for mui/base-ui is 71.0%, based on public PR activity from non-core contributors.
mui/base-ui currently has 1 active issue(s) tagged with beginner-friendly labels like "good first issue", "beginner", or "up-for-grabs".
Unstyled UI components for building accessible web apps and design systems. From the creators of Radix, Floating UI, and Material UI.
Balanced & professional review environment in mui/base-ui. Maintains strict focus on technical quality and test standards.
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/mui/base-ui?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 07:00 UTC (07:00 UTC in your timezone). Recommended submission window is Monday - Wednesday from 06:00 to 10:00 UTC (06:00 - 10:00 UTC local).
Maintainer Strategy: Maintainer Sweet Spot: PRs under 150 lines merge in ~16 hours (89% approval). Large PRs (>500 lines) take ~115 hours (32% approval). Keep your diff compact for rapid review.
Feature request Summary - type SelectValueType<Value, Multiple extends boolean | undefined> = Multiple extends true ? Value[] : Value; + type SelectValueType<Value, Multiple extends boolean | undefined> = Multiple extends true ? readonly Value[] : Value; Allow passing readonly (immutable) array as value for Select. Examples in other libraries Maybe not the best example because it's options and not value: https://github.com/mui/material-ui/blob/77245fd41663c22eeedd3f7072deafd7aa1284da/packages/mui-material/src/useAutocomplete/useAutocomplete.d.ts#L298 Motivation I'm in react, so approximately all of my arrays are readonly, and I'm trying to write correct types.
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 mui/base-ui, 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 mui/base-ui acknowledge new external contributions in approximately -. Out of all submitted pull requests from non-core authors in the last 180-day window, 71.0% were successfully merged into the primary branch.
mui/base-ui has a recorded first-timer success rate of 70.0%. Repositories ranked Welcoming typically provide actionable feedback during code reviews and actively nurture new community contributors.
The initial maintainer response time averages ~-. 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 64.7 places mui/base-ui in the Welcoming tier.
The external pull request merge rate is 71.0%. GetMerged isolates non-core community contributions so external developers get an accurate benchmark of PR acceptance probability.
Yes, mui/base-ui 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 mui/base-ui 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.