Is ModernFlyouts Open Source, and Where Is Its Code?

Yes. ModernFlyouts is open source. The project site describes it as "an open source, modern, and Fluent Design-based replacement for the old Metro-themed flyouts present in Windows 10," and it directs users to GitHub Releases for downloads. The organization name in the site's hostname, modernflyouts-community.github.io, also signals that this is a community-run project rather than a closed commercial product.

What "Open Source" Means Here

The site's own description is the primary evidence: the source code is publicly available, and the project positions itself as community-driven. Two practical consequences follow:

• You can inspect the code before installing. Because the project is hosted on GitHub, the full source is available for review rather than only a compiled installer.
• Distribution goes through public channels. The site points to two official sources: the Microsoft Store ("Get it from Microsoft") and GitHub Releases. Either is consistent with an open-source project; the GitHub route lets you see exactly which build corresponds to which release.

The site does not state a specific license on the page, so if license terms matter to you (for example, for corporate deployment or redistribution), check the repository's license file directly rather than assuming.

Where to Find the Code and Releases

The site's page shows only a brief description plus those two download paths, so the GitHub repository is the place to go for anything beyond installing — commit history, open issues, and version-by-version changes.

How to Check Activity Before Installing

Trust in a community project is best judged by recent activity, not by the description alone. A quick check:

1. Open the GitHub repository and look at the date of the latest commit and the latest release. Recent dates indicate the project is maintained.
2. Scan the open issues list for how quickly maintainers respond and whether bug reports get triaged.
3. Read the release notes for the version you plan to install to see what changed and whether known problems are listed.

If you find a bug or want to request a feature, the issues section of the repository is the standard channel — that is how community projects collect feedback, and it is also a way to gauge responsiveness before you rely on the tool.

A Reasonable Decision Path

• If you just want the modern flyouts on Windows 10: install from the Microsoft Store or GitHub Releases, as the site directs.
• If you need to verify safety or licensing first: review the source and license on GitHub before installing, since the site itself gives only a summary.
• If you want to contribute or report a problem: use the GitHub repository's issues and pull requests rather than the website, which functions as a landing page.

One caveat: the site describes the tool as a replacement for "the old Metro-themed flyouts present in Windows 10." It does not, on the page provided, spell out which specific flyouts are replaced or which Windows versions are supported — check the repository's documentation for those details before assuming compatibility with your build.