Nine Mac Apps That Fill macOS's Open Source Gaps

There's this interesting thing that happens when a proprietary operating system leaves functionality gaps: communities build around them. Not out of spite, necessarily—more like... organic necessity. Someone needs window snapping that actually works. Someone else can't believe Apple shipped a notch without making it useful. And so the ecosystem fills in.

Alex from Alex Gear & Tech recently catalogued nine such tools, apps that either paper over macOS's deliberate omissions or reimagine features Apple half-implemented. What's revealing isn't just that these tools exist—it's how many are free, open source, or available through one-time purchases. In an era when every app wants a subscription, these developers chose different models. That's worth examining.

The Notch Problem Apple Won't Solve

Start with NotchNook, which does something genuinely clever with the MacBook's controversial screen cutout. Instead of treating it as dead space to ignore (Apple's approach), NotchNook turns it into a temporary file shelf. You drag items into the notch area while switching between apps, then retrieve them. "The irony is it's so fluid that it feels like it should have been a native Mac OS feature," Alex notes.

This hits on something fundamental about how Apple approaches features versus how third-party developers do. Apple built the Dynamic Island for iPhone—interactive, contextual, genuinely useful. But the Mac notch? Just... sit there and pretend it's not blocking your menu bar. The company that obsesses over every pixel chose inertia.

NotchNook isn't free (there's a trial), but it represents a pattern: developers solving problems Apple either can't be bothered with or deliberately won't address for reasons of design philosophy or planned obsolescence.

Open Source Doing the Work

Several apps on Alex's list are fully open source, which matters for reasons beyond price. Ice, for instance, tackles menu bar clutter—another problem that worsens with every app you install but that Apple refuses to address systematically. Ice is free, open source, and does what you'd expect: hides menu bar icons until you need them, with a hover-to-reveal feature that feels native.

"You can customize the icon of course and choose whatever you want. But you can actually customize the entire bar at the top. You can add shadow, change color, change the shape," Alex explains. This level of customization isn't something Apple would ever ship. It violates their design consistency principles. But it's exactly what power users need.

Loop takes the same approach to window management. It's open source, uses a radial menu triggered by keyboard shortcuts or mouse gestures, and makes window snapping actually pleasant. "It's pure muscle memory and faster than hunting for shortcut keys," Alex says. Once you use it, apparently you don't go back.

Pearcleaner rounds out the open source trio—a tiny app that does what macOS's app deletion should do: actually remove the app. When you delete software on Mac, it leaves preference files, caches, support files scattered across your system. Pearcleaner watches for deletions and offers to clean up the debris. It's not as feature-rich as commercial alternatives like CleanMyMac, but for basic maintenance it's sufficient and free.

These aren't hobbyist projects. They're solving real friction points that affect daily workflows. That Apple hasn't addressed them after years of user requests suggests either resource prioritization issues or philosophical disagreement about what the OS should do.

The Cross-Platform Reality

Blip exposes another gap: file transfer between devices. AirDrop works brilliantly... within Apple's ecosystem. But try sending a 5GB file to a Windows PC or Android phone and you're in for pain. Blip provides AirDrop-like functionality across platforms—Mac, Windows, Android, iOS. It's completely free and, according to Alex, "consistently as fast or even faster sometimes than AirDrop, especially for those heavier four or five gig files."

Worth noting: Blip uses internet connectivity rather than local network transfer, which means performance varies with your connection. But for anyone working across platforms—which is most people in creative or IT work—it's addressing something Apple won't because doing so would weaken ecosystem lock-in.

DeskIn goes further, offering remote desktop functionality that works across devices and platforms. It uses something called a Zero Sync engine to push 4K at 60fps, allowing actual video editing or gaming remotely. Alex demonstrates using it to turn an Android tablet into a second Mac monitor. The fact that it treats the tablet as an actual display in macOS settings—not just a screen mirror—shows thoughtful implementation.

Both apps exist because Apple's Continuity features, while impressive, only work within the walled garden. There's no technical reason AirDrop couldn't support Android. There's every business reason it doesn't.

Workflow Tools Apple Won't Build

Dropover creates a floating shelf for collecting files from multiple sources before moving them to their final destination. Instead of scattering downloads across Desktop and Downloads folder, you stage everything in one place, then batch-move it. "This is huge for just staying in the flow," Alex explains, "without having to think about oh my gosh you know where did I place that."

ScreenFloat 2 is the only genuinely expensive app in the list (one-time purchase, not subscription), but it reimagines screenshots completely. Instead of cluttering your desktop, screenshots float above other windows. You can grab text from them via OCR, redact sensitive information before sharing, organize screen recordings—all without leaving the app.

These aren't solving technical limitations. They're solving workflow assumptions baked into macOS. Apple assumes you'll use Finder to organize files. They assume screenshots are artifacts to save and forget. These developers asked: what if we changed those assumptions?

Local AI as Infrastructure

Msty deserves separate attention because it represents a different kind of gap. It lets you run large language models locally on Apple Silicon, comparing different models side-by-side without command line complexity. Alex discovered it while stress-testing a Mac Mini: "I realized I needed something a little bit more friendly cuz I'm not a coder."

Running LLMs locally isn't just about privacy (though that matters). It's about infrastructure control. Cloud AI services can change pricing, shut down, or alter terms of service. Local models, once downloaded, are yours. But the technical barrier is real—most tools assume developer-level comfort with terminals and dependencies.

Msty smooths that considerably while leveraging the Neural Engine in Apple Silicon. It's not open source (freemium model), but it's addressing Apple's apparent disinterest in making AI accessible at the system level. Apple ships ML frameworks for developers. They don't ship user-facing tools for running your own models.

What the Pattern Reveals

Look at these nine apps collectively and a pattern emerges: they're addressing friction points that have persisted for years. Apple knows about menu bar clutter—they implemented menu bar collapsing in macOS Ventura, but it's partial and awkward. They know about window management—Stage Manager exists, but it's polarizing and doesn't replace traditional snapping. They know about the notch—they built the Dynamic Island for iPhone but left Mac users with dead space.

Some of this is resource allocation. Apple's macOS team is smaller than their iOS team, and features get prioritized accordingly. Some is philosophy—Apple believes in opinionated design, and that means saying no to customization that would satisfy power users but confuse mainstream ones.

But some of it reveals the limits of what a for-profit company will build. Open source tools like Ice, Loop, and Pearcleaner exist because developers scratched their own itches and shared the results. They're not trying to build businesses around menu bar management. They're solving problems and releasing solutions.

The apps that aren't open source—NotchNook, ScreenFloat 2, parts of DeskIn and Msty—mostly use one-time purchase models. As Alex notes: "I don't like subscriptions." Neither do a lot of developers who remember when software was something you bought and owned.

These tools aren't just filling gaps. They're demonstrating alternative approaches to software sustainability that don't involve perpetual rent-seeking. Whether that model scales is an open question—open source particularly struggles with maintainer burnout and funding. But for utilities that solve specific problems well, it appears to work.

What Apple builds defines what most users experience. What the developer community builds around those gaps reveals what's missing and what's possible. These nine apps aren't indictments of macOS—several developers clearly love the platform enough to improve it. But they're evidence that even carefully designed systems leave needs unmet, and that communities will build what companies won't.

Dev Kapoor covers open source and developer communities for Buzzrag.