Is Rectangle App Safe? Open Source, Permissions, and Privacy Explained 

By Ryan Hanson, creator of Rectangle · Tested on macOS 15.5 with Rectangle 0.96 · Updated July 2026

Short version: Yes, Rectangle is safe. It's open source under the MIT license, so its entire codebase is public on GitHub for anyone to inspect. It asks for macOS Accessibility permission — the standard requirement for any window manager — and collects no telemetry. The Accessibility prompt looks scary but is completely normal, and this explains exactly what it does and doesn't allow.

The short, honest answer

Rectangle is one of the safer apps you can install on a Mac, for a specific and verifiable reason: you don't have to take anyone's word for it. The code is open source and published on GitHub, which means the exact behavior of the app is auditable by anyone with the skills to read it — and, importantly, by the many people who already have. Closed-source apps ask for trust. Open-source apps offer proof.

That said, "it's open source" isn't a satisfying answer if you don't know what that implies or why Rectangle needs the permission it asks for. So let's go through the three things people actually worry about: the source code, the Accessibility permission, and privacy.

Open source: what it actually means for you

Rectangle is released under the MIT license, one of the most permissive and widely trusted open-source licenses. In practical terms, that means the complete source code lives publicly on GitHub. Anyone can read every line, see exactly what the app does, check whether it phones home, and verify there's nothing hidden inside.

This matters even if you personally never read a line of code. Open-source software of any popularity gets scrutinized by developers, security-minded users, and package maintainers. Rectangle is popular and long-established, so if it did something shady — quietly collected data, contacted suspicious servers, behaved differently than it claims — someone in that community would have spotted it and raised the alarm publicly. That collective auditing is a real safety mechanism that closed apps simply don't have.

The Accessibility permission: why it's needed and what it allows

Here's the part that makes new users nervous. On first launch, Rectangle asks for Accessibility access under System Settings → Privacy & Security → Accessibility. macOS frames this permission with serious-sounding language, and that scares people. It shouldn't, and here's why.

Moving and resizing other apps' windows is, by design, something macOS won't let an app do without explicit permission. Accessibility access is the specific permission Apple provides for exactly this kind of control. Every window manager on the Mac — Rectangle, Magnet, BetterSnapTool, Moom, all of them — needs it, because there's no other way to reposition windows system-wide. Rectangle isn't asking for anything unusual; it's asking for the one permission its entire job depends on.

What that permission lets Rectangle do is move, resize, and position windows. What it does with that ability is exactly what you see: snap windows when you drag or press a shortcut. The permission is powerful in the abstract, which is why Apple gates it, but Rectangle's use of it is narrow, visible, and verifiable in the source.

Privacy: what Rectangle collects

The privacy answer is short: essentially nothing. Rectangle isn't built to collect data, and because it's open source, that claim is checkable rather than just stated. There's no advertising business behind it, no data-harvesting model, no reason for it to track you — and the code backs that up.

Compare that to the usual situation with free software, where "free" often means you're the product. Rectangle is free in the other sense: free as in open source, maintained in the open, with no hidden monetization of your behavior. The optional paid Rectangle Pro is how the project is supported financially, not your data.

Is it safe to install outside the App Store?

This trips people up because Rectangle isn't on the Mac App Store — it's a direct download or a Homebrew install. Some assume "not on the App Store" means "risky." It doesn't. Rectangle isn't on the App Store because Apple's sandboxing rules conflict with the Accessibility-level control a window manager needs, not because it couldn't pass review on safety grounds.

To install safely, get Rectangle for Mac from its official site at rectangleapp.com or through Homebrew, both of which are the legitimate sources. As with any Mac app downloaded outside the App Store, macOS Gatekeeper will verify it's properly signed before it runs. Download from the official channel and you're getting the real, signed application.

The honest verdict

Rectangle is safe, and unusually so, because its safety is verifiable rather than promised. Open source under the MIT license, publicly auditable on GitHub, scrutinized by a large community, no telemetry, and a single permission that every window manager requires and that Rectangle uses exactly as advertised. The Accessibility prompt is normal, the lack of App Store presence is a distribution choice rather than a red flag, and there's no data-harvesting model lurking underneath.

If anything, Rectangle is a model for how a Mac utility should handle trust: do one thing, ask only for what that thing needs, and open the code so no one has to take your word for it. Install it from the official source, grant the Accessibility permission it asks for, and you're set.

Frequently asked questions

Is Rectangle safe to install on a Mac?

Yes. Rectangle is open source under the MIT license, so its full code is publicly auditable on GitHub, and it's scrutinized by a large community. It collects no telemetry and asks only for the Accessibility permission every window manager needs. Install it from the official site or Homebrew and it's a safe, signed app.

Why does Rectangle need Accessibility permission?

Because macOS won't let any app move or resize other apps' windows without it. Accessibility access is the specific permission Apple provides for that kind of system-wide control, and every Mac window manager requires it. Rectangle uses it only to snap and position windows.

Does Rectangle collect my data?

Essentially no. Rectangle has no advertising or data-harvesting model, and because it's open source, that claim is verifiable in the code rather than just stated. There's no hidden tracking; the project is supported by the optional paid Rectangle Pro, not your data.

Is it risky that Rectangle isn't on the App Store?

No. Rectangle isn't on the App Store because Apple's sandboxing conflicts with the Accessibility control a window manager needs, not for safety reasons. Downloaded from the official site or Homebrew, it's properly signed and verified by macOS Gatekeeper like any legitimate app.

This is a safety and privacy overview, not a security audit. Rectangle's source is public on GitHub for anyone who wants to verify its behavior directly. Written and tested by Ryan Hanson, creator of Rectangle, on macOS 15.5.