TL;DR
Looking for free alternatives to DisplayBuddy? Here are the best open source and free options for Mac.
What is the best free alternative to DisplayBuddy?
The best free alternative to DisplayBuddy ($24.99) is Lunar. Install it with: brew install --cask lunar.
Free Alternative to DisplayBuddy
Save $24.99 with these 1 free alternatives that work great on macOS.
Our Top Pick
Quick Comparison
| App | Price | Open Source | Category |
|---|---|---|---|
| DisplayBuddy | $24.99 | No | — |
| Lunar | Free | No | System Utilities |
Best Free Alternative to Displaybuddy for Mac
Displaybuddy ($24.99 one-time) simplifies external monitor management on macOS with DDC/CI controls, brightness syncing, and preset workflows. In 2026, multi-monitor setups are standard for developers, designers, and remote workers—but paying for basic display controls feels increasingly unnecessary when capable free alternatives exist. Whether you are scaling your home office or just want your external monitor to match your MacBook's brightness automatically, free tools can deliver comparable functionality. Lunar stands out as the most mature free alternative, offering intelligent adaptive brightness, DDC-based hardware control, and advanced features like XDR brightness unlock for Apple displays. While Displaybuddy offers a polished UI and Windows cross-platform support, Lunar's free tier handles the core use case—automated, synchronized brightness across all your displays—without requiring a license fee. For Mac users exclusively, Lunar's native optimizations and open-source transparency make it the pragmatic choice.
Detailed Alternative Reviews
Lunar
Intelligent adaptive brightness for external displays
brew install --cask lunarLunar is the most feature-rich free alternative to Displaybuddy, offering DDC/CI-based hardware brightness control, automatic adaptive brightness via multiple modes, and unique features like XDR brightness unlock for Pro Display XDR and MacBook Pro screens. The free version includes brightness/volume control, input switching, BlackOut mode, and 100 manual adjustments per day—more than sufficient for most users. Unlike Displaybuddy, Lunar is open-source, actively maintained by developer Alin Panaitiu since 2019, and deeply optimized for macOS with native Apple Silicon support. The Pro license ($23+ one-time or subscription) unlocks unlimited adjustments, Sync Mode for automatic brightness matching across displays, Location Mode for sun-based adaptation, and Sensor Mode for ambient light detection. However, the free tier delivers 90% of the functionality users actually need, including the critical DDC hardware control that distinguishes serious monitor utilities from software-only dimming apps.
Key Features:
- DDC/CI hardware control for brightness, contrast, and volume on external monitors
- Adaptive brightness with location-based, time-based, and sync modes
- XDR Brightness unlock for Pro Display XDR and MacBook Pro (exceeds 500 nits)
- BlackOut mode to selectively turn off displays without disconnecting
- FaceLight feature turns your monitor into a video call light source
- Native Apple Silicon optimization with excellent M-series performance
- 100 free manual adjustments per day (sufficient for most workflows)
Limitations:
- • Free version limited to 100 brightness/contrast adjustments per day
- • Some advanced sync features require Pro license
- • No native Windows support—macOS only
- • Interface has a steeper learning curve than Displaybuddy's simplified UI
Best for: Mac users who want hardware-level brightness control with adaptive automation, especially those with Apple displays who can benefit from XDR unlock features.
Which Alternative is Right for You?
Dual-monitor setup with MacBook and external display needing brightness sync
→ Lunar free tier handles this perfectly with DDC hardware control. The Pro Sync Mode learns your preferences and automatically keeps displays matched, but you can achieve the same manually with the free version's 100 daily adjustments.
Using Pro Display XDR or MacBook Pro and want brightness above 500 nits
→ Lunar is the only option here—its free XDR Brightness feature unlocks the full 1600 nits potential of Apple's premium displays. Displaybuddy does not offer XDR unlock functionality.
Cross-platform workflow between Mac and Windows
→ Displaybuddy is the clear winner with native Windows support. Lunar is macOS-only, so you would need separate solutions on each platform.
Simple, occasional brightness adjustments on a budget
→ Lunar free tier is sufficient. 100 adjustments per day equals more than 6 adjustments per waking hour—plenty for casual users who just want to dim their monitor in the evening.
Video calls requiring face lighting in dark rooms
→ Lunar's free FaceLight feature turns any monitor into a bright, warm LED panel for video calls—something Displaybuddy does not offer natively.
Migration Tips
Transferring Display Presets
Displaybuddy presets are proprietary, so you will need to recreate them in Lunar. The good news: Lunar's adaptive modes (Sync, Location, Clock) often eliminate the need for manual presets entirely by automating brightness based on context.
Keyboard Shortcuts Differences
Lunar supports the same brightness keys as Displaybuddy, with additional modifiers. Use Ctrl+Brightness to adjust external monitors separately. You can remap shortcuts in Lunar's settings to match Displaybuddy if muscle memory is an issue.
DDC Troubleshooting
If your monitor stops responding after switching apps, check that only one DDC app is running. Disable Displaybuddy completely before launching Lunar to prevent protocol conflicts. Restart your monitor if DDC becomes unresponsive.
Maximizing Free Tier Limits
Lunar counts adjustments in bursts—you can press brightness up 5 times in 3 seconds and it counts as one adjustment. Enable adaptive modes to reduce manual adjustments entirely, staying well within the 100/day free limit.
XDR Brightness Safety
If using Lunar's XDR unlock on MacBook Pro or Pro Display XDR, monitor the temperature warning icon. macOS has hardcoded thermal limits that will force-reduce brightness before any damage occurs. Avoid keeping XDR active for hours on static white backgrounds.
Quick comparison
| Feature | Displaybuddy | Lunar (Free) |
|---|---|---|
| Price | $24.99 one-time | Free (100 adjustments/day) |
| DDC/CI Control | Yes | Yes |
| Adaptive Brightness | Sync mode | Sync, Location, Sensor, Clock modes |
| XDR Brightness | No | Yes (free) |
| Platform | Mac & Windows | Mac only |
| Open Source | No | Yes |
| Presets | Unlimited | Available |
| Siri Integration | Yes | Shortcuts support |
The verdict
Lunar
The free tier delivers hardware-level DDC control and adaptive brightness features that match or exceed Displaybuddy's core functionality. XDR unlock for Apple displays and open-source transparency are compelling bonuses.
Full reviewMonitorControl
If Lunar's 100 adjustment limit is problematic, MonitorControl is a completely free, open-source alternative with no usage restrictions and native macOS integration.
Bottom line
Lunar's free tier replaces Displaybuddy for the vast majority of Mac users. You get hardware brightness control, multiple adaptive modes, and unique features like XDR unlock. Only cross-platform users or those wanting unlimited adjustments without Pro should stick with Displaybuddy.
Frequently Asked Questions
Related Technologies & Concepts
Sources & References
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About the Author
Productivity & Workflow Analyst
Jordan Kim focuses on productivity software, system utilities, and workflow optimization tools. With a background in operations management and process improvement, Jordan evaluates how well applications integrate into daily workflows and enhance overall productivity.