Best DockDoor Alternatives & Mac Window Switchers in 2026
DockDoor brought Windows-style window peeking to the macOS Dock — and it's excellent. But it's not the only way to see and switch windows fast. Here's an honest look at the best alternatives and how they differ.
What DockDoor actually does
DockDoor is a free, open-source utility that reintroduces "window peeking" to macOS. Hover over an app icon in the native Dock and you get live previews of its open windows; click one to switch or manage it. It also adds Option+Tab window switching, keyboard controls, and one-click window actions (close, minimize, maximize). It runs on macOS 13 and later and has become genuinely popular — thousands of GitHub stars and frequent updates. There's also a separate paid "DockDoor Pro" that replaces the Dock entirely.
It's a focused, well-made app. So the real question isn't "what's better than DockDoor" — it's "what's the right tool for the specific window problem you have?"
Why look for an alternative?
- You want Alt+Tab behavior (cycle windows with a keyboard shortcut), not Dock hover previews.
- You're on older macOS or want a different feature mix.
- You'd prefer fewer menu-bar utilities — one app that peeks windows and does other daily jobs.
- You want to compare before committing.
The contenders at a glance
| App | Price | Approach | Open source | Also does… |
|---|---|---|---|---|
| DockDoor | Free | Dock hover previews + Alt+Tab | Yes | Window actions |
| AltTab | Free | Windows-style Alt+Tab switcher | Yes (GPL) | Window controls |
| FlowShelf | Free | Dock hover previews + Option+Tab grid | Yes | Shelf, clipboard, screenshots, OCR |
Verified June 2026; check each developer's site for current details. AltTab and DockDoor offer optional paid "Pro" tiers.
The best alternatives, reviewed
AltTab — the best Alt+Tab window switcher
If your muscle memory is Windows' Alt+Tab, AltTab is the app. It's free and open source (GPL-3.0), with more than 15,000 GitHub stars and eight-plus years of development. Press Option+Tab and you get a row of live thumbnails of every window — including minimized and hidden ones — across all Spaces and monitors. Hold and tap to move along, release to switch. There's an optional AltTab Pro ($9.99 one-time) that adds type-to-search and extra styles, but the free version is the complete switcher, not a trial. It needs Accessibility and Screen Recording permissions to show thumbnails. This is the most direct "alternative" if you want keyboard switching rather than Dock hovering.
DockDoor — still the best for Dock previews
It would be dishonest to put together this list and not say it plainly: if Dock hover previews are exactly what you want, DockDoor is the best option and it's free. Alternatives make sense when you want a different behavior (Alt+Tab) or a broader tool. For pure Dock peeking, DockDoor is hard to beat.
FlowShelf — window peek inside an all-in-one
FlowShelf isn't a dedicated window-switcher, but its Peek feature now covers both styles: live window thumbnails on Dock hover (like DockDoor) and an Option+Tab switcher that shows a grid of live previews, growing from 2×2 to 3×3 to 4×4 as you cycle (like AltTab). It's bundled into one free, private menu-bar app that also gives you a drag-and-drop shelf, automatic clipboard capture, screenshots, and OCR. The pitch is simple: if you'd rather run one lightweight app for "see my windows, stash my files, find what I copied, grab a screenshot" than four separate utilities, FlowShelf is built for that. That said, DockDoor and AltTab each have years of focus on this one job — DockDoor's Dock-preview depth and AltTab's keyboard switching go further if window management is all you care about.
Want window peek + a shelf + clipboard in one app?
FlowShelf bundles Peek, a shelf, clipboard history, and screenshots — free, native, private. macOS 12+ · Apple Silicon & Intel.
Download FlowShelf — FreeWhich should you pick?
- Want Dock hover previews? → DockDoor (free). It's the best at this.
- Want Windows-style Alt+Tab switching? → AltTab (free).
- Want a light window peek plus a shelf, clipboard, and screenshots in one app? → FlowShelf (free).
These aren't really enemies — plenty of people run a dedicated switcher and an all-in-one collector. Pick based on the job you do most.
Frequently asked questions
Is DockDoor free?
Yes, DockDoor is free and open source. There's a separate paid "DockDoor Pro" that replaces the Dock entirely, but the core app is free.
What's the best free DockDoor alternative?
For Alt+Tab switching, AltTab (free, open source). For an all-in-one that includes window peeking plus a shelf, clipboard, and screenshots, FlowShelf (free).
Does FlowShelf replace DockDoor?
For many people, yes — FlowShelf's Peek now includes Dock hover previews and an Option+Tab grid switcher. But DockDoor remains more specialized and configurable for Dock previews specifically. FlowShelf is for people who want one app for several daily tasks (windows, files, clipboard, screenshots, OCR) rather than a dedicated switcher.
Do these apps need special permissions?
Window-preview and switcher apps typically need Accessibility and Screen Recording permissions to read and show your windows. Grant them in System Settings ▸ Privacy & Security.