TeenyDisplay vs BetterDisplay vs Lunar vs MonitorControl

If all you need is brightness control for a third-party monitor, start with the narrowest tool that solves that problem. A monitor app can grow from "make F1/F2 work" into custom resolutions, virtual displays, ambient light sensors, app presets, scripts, and hardware diagnostics very quickly. That is useful for some desks. It is also a lot of UI to keep around if you only wanted your Dell, LG, Samsung, BenQ, or ASUS display to stop blasting your eyes at night.

This comparison uses app facts from the TeenyDisplay website and source code, plus the official pages for BetterDisplay, Lunar, and MonitorControl. Prices and feature names below were checked on April 30, 2026.

quick pick

what all four apps are trying to fix

macOS does not expose hardware brightness controls for most non-Apple external monitors. The common workaround is DDC, short for Display Data Channel. When a monitor, cable, adapter, and Mac port pass DDC correctly, an app can send commands for brightness, contrast, volume, input switching, and power.

DDC is also why compatibility is never a clean yes or no. Lunar's FAQ puts it plainly: a monitor needs to support DDC, and the connection path must not block DDC commands. A dock, cable, adapter, or monitor setting can be the weak link.

For setup context, see the separate guide to controlling external monitor brightness on Mac. It goes deeper on DDC, Apple Silicon HDMI, and why the Mac brightness keys often ignore external displays.

where TeenyDisplay fits

teenydisplay is the small paid option. It lives in the menu bar and controls external monitor brightness, contrast, volume, input source, and power when the display exposes those controls over DDC. It also handles software dimming when a monitor does not expose DDC brightness.

The HDMI detail matters. TeenyDisplay tries the standard IOKit I2C path first for Thunderbolt, USB-C, and DisplayPort displays. If that path is not available, it falls back to IOAVService for Apple Silicon built-in HDMI. That is the awkward connection where many older DDC tools used to fail.

TeenyDisplay also has the everyday features that make external monitor control feel native: optional F1/F2 brightness key interception, optional volume key interception, custom shortcuts, an on-screen display, brightness sync across selected displays, named presets, launch at login, and a teenydisplay:// URL scheme for brightness, contrast, volume, input, power, presets, and display info.

It is not trying to be a custom-resolution workshop. It can list and switch available resolutions and refresh rates, including hidden modes when macOS exposes them, and it shows the active color profile. It does not create virtual displays or rewrite display configuration at the depth BetterDisplay does.

MonitorControl is the free baseline

MonitorControl is free and open source. Its official GitHub page says it controls external display brightness, volume, and contrast, shows the native OSD, supports menu bar sliders, and can use Apple keyboard keys or custom shortcuts.

It also supports several brightness methods: DDC for external displays, Apple's native protocol for Apple and built-in displays, gamma table control for software dimming, and shade control for AirPlay, Sidecar, DisplayLink, and other virtual screens.

Pick MonitorControl first if budget is the deciding factor or you specifically want open source. Move to a paid app when you want a cleaner paid support path, presets and URL automation, deeper display management, or adaptive brightness features.

BetterDisplay is the heavy display toolbox

BetterDisplay covers far more than brightness. Its official GitHub page lists flexible HiDPI scaling, custom resolutions, XDR/HDR brightness upscaling, virtual screens, Picture in Picture, soft disconnect, EDID overrides, DDC control, color mode selection, syncing, layout protection, CLI integration, URL schemes, HTTP integration, notifications, and macOS Shortcuts support.

That breadth is the reason to choose it. If you need a virtual screen for a headless Mac, want to tune scaling beyond the stock macOS choices, or need display layout protection, TeenyDisplay is too narrow and MonitorControl is too simple.

The tradeoff is weight. BetterDisplay is a better fit when display configuration itself is the project. If the job is "make external brightness keys work and maybe save a few presets," a smaller app will be easier to live with.

Lunar is for adaptive brightness

Lunar is built around automatic brightness behavior. Its free Manual Mode lets familiar brightness and volume keys control external monitors, and its DDC feature sends commands such as brightness and input changes directly to the monitor.

Lunar Pro adds the parts that make it different: Sync Mode for matching external monitors to the built-in display's adaptive brightness, Sensor Mode for using an external ambient light sensor, Clock Mode, Location Mode, XDR brightness, BlackOut, FaceLight, app-based presets, and more. Lunar's FAQ also notes that the 14-day Pro trial starts automatically on first launch and free features remain usable after the trial.

Pick Lunar if you care about brightness changing by room light, sun position, or schedule. If you prefer explicit sliders, shortcuts, and presets without the adaptive layer, TeenyDisplay or MonitorControl will feel calmer.

feature comparison

which one should you install?

Install MonitorControl if you want the free answer first. It is hard to argue with free when your need is basic brightness, contrast, volume, and keyboard control.

Install TeenyDisplay if you want a small paid utility with Apple Silicon HDMI handling, presets, shortcuts, URL automation, software dimming, and a menu bar UI that stays close to the monitor-control job.

Install BetterDisplay if your monitor setup has become a display engineering problem. Custom resolutions, virtual screens, XDR/HDR upscaling, EDID work, PIP, and layout protection belong there.

Install Lunar if the display should adapt itself through sensors, schedules, sun position, or built-in-display sync. That is Lunar's lane.

small caveats before you blame the app

DDC depends on the whole chain. A monitor can support DDC and still fail through a dock that blocks it. HDMI can behave differently from USB-C or DisplayPort. Some monitors accept brightness commands but ignore volume or input commands. Some show their own on-screen display every time an app writes a value.

When a monitor will not respond, test the boring parts first: connect directly, swap the cable, enable DDC/CI in the monitor's own settings, and try USB-C to DisplayPort if HDMI is the trouble spot. That advice applies to every app in this comparison.