Display Dimmer
Hardware + software control
Hardware and software brightness.
Use DDC/CI on compatible external monitors, WMI on supported laptop panels, or software gamma dimming.
Free coreOptional one-time Pro
Windows app comparison
Display Dimmer vs Twinkle Tray
Compare brightness control, automation and cost. Find the right fit for your screens.
Twinkle Tray
Free & open source
Free hardware controls + automation.
Schedules, app profiles and supported monitor settings, without a paid upgrade.
Completely freeOpen source
Feature comparison
Hardware support, profiles, triggers and monitor controls.
Stable and beta differ. Twinkle Tray’s newer 1.18.0-beta2 adds optional gamma brightness. The beta also adds supported ambient-light sensor automation. These prerelease features are separate from the stable baseline. [11] [14]
| Feature | Display DimmerFree + Pro | Twinkle TrayStable 1.17.2 · Free |
|---|---|---|
| Brightness & color | ||
| External monitor brightness[1][9] | DDC/CI hardware controlFreeCompatible external monitors and connections. | DDC/CI hardware controlFreeCompatible monitors and connections. |
| Software dimming[3][11][9] | Built-in gamma dimmingFreeDims the image when hardware control is unavailable or disabled. It does not lower the backlight. | Available in the newer betaBetaStable 1.17.2 has no general gamma control; 1.18.0-beta2 adds optional software brightness. |
| Built-in laptop display / WMI[5][17] | WMI hardware brightnessFreeOpt-in control for compatible internal panels; gamma is also available. | WMI hardware brightnessFreeCompatible internal panels. |
| Color temperature[2][7] | Software color temperaturePreview / Pro30 minutes/day free; Pro removes the daily preview limit. | Supported hardware color controlsFreeCustom VCP controls depend on the monitor; no integrated software Kelvin control was verified. |
| Contrast[2][8] | Software contrastFreeAdjusts the displayed image through gamma; separate from hardware brightness. | Hardware contrastFreeRequires compatible DDC/CI monitor support. |
| Presets & condition-based dimming | ||
| Saved presets[12][15] | Brightness, contrast + temperatureProSave levels per display, leave channels unchanged and recall from the app or automation. | Named brightness profilesFreeSave per-monitor brightness and recall profiles from the tray menu. |
| Idle dimming[2][16] | Temporary brightness limitFree / ProAll displays idle dimming is free; individual displays and linked groups require Pro. | Built-in idle dimmingFreeIncludes fullscreen and media-related exclusions. |
| Lock-screen dimming[2][16] | Temporary brightness limitProCap brightness while the Windows session is locked. | Lock-screen pause optionDisable on Lock Screen pauses control; no dedicated lock brightness limit was documented. |
| Battery-power dimming[13][16] | Temporary brightness limitProCap brightness while the laptop runs on battery power. | No dedicated battery trigger documentedA battery/power-source automation request remains open. |
| Low-battery dimming[2][11][16] | Battery-percentage thresholdProCap brightness at or below a chosen battery percentage; this condition can also apply while charging. | No dedicated threshold rule documentedNo built-in battery-percentage trigger was found in the reviewed stable or beta features. |
| Automation | ||
| Schedules[1][7] | Time-based schedulesFree / Pro1 All displays rule free; Pro adds more rules, display targeting and preset actions. | Time + sun-position schedulesFreePer-display scheduling is included. |
| App-based rules[12][7] | App-based rulesFree / Pro1 All displays rule free; Pro adds more, presets and targeting the display with a fullscreen app. | Focused-app profilesFreeBrightness profiles for active applications. |
| Hotkeys[2][7] | Keyboard shortcutsFree / Pro2 All displays hotkeys free; Pro adds more, targeted controls and preset recalls. | Per-display + all-displayFreeConfigurable shortcuts, including brightness and supported VCP commands. |
| CLI / local API[5][8][15] | CLI + local APIProBrightness, contrast, temperature, state and advanced VCP commands. | Brightness + VCP commandsFreeCommand-line control while Twinkle Tray is running. |
| Monitor tools | ||
| Multiple displays[3][2][7] | Individual or All displaysFree / ProManual per-display controls are free; targeted automation requires Pro. | Individual or linkedFreeIncludes normalization and calibration curves. |
| Linked display groups[2][7] | Named linked display groupsProChoose displays to adjust together and target the group in automation. | Link brightness adjustmentsFreeShared brightness is included; no equivalent named automation-group picker was verified. |
| HDR SDR brightness[4][9] | No dedicated SDR sliderDDC/CI depends on the monitor. Software gamma may be bypassed or reset under HDR. | Dedicated SDR brightness controlFreeAdjusts SDR content while Windows HDR is on. |
| Other hardware controls[2][8] | VCP through the CLI/APIProAdvanced commands for supported monitor hardware; no general-purpose VCP control panel. | Controls in the interfaceFreeSupported volume, input and custom VCP controls. |
| DDC/CI troubleshooting[10][2][9] | Per-display health trackingVerified results, possible-cause hints, pause and Try again. | Detection + debug reportDocumented connection and display-detection troubleshooting. |
| Cost & source | ||
| Price[1][7] | Free + one-time upgradeOptional Pro; check your local price. | Completely freeNo paid feature tier. |
| Source code[6] | Closed sourcePublic documentation and releases. | Open sourceApplication source is MIT-licensed. |
Triggers are brightness limits. Display Dimmer triggers temporarily cap brightness while a condition applies, then restore the current levels or automation. They work with enabled DDC/CI, WMI and software paths; disabled brightness controls are skipped. Gamma dimming changes the image and does not guarantee backlight power savings. [16]
Your setup still matters. DDC/CI and WMI require compatible hardware. Software gamma works on most Windows SDR displays, but HDR may bypass or reset it. Try your own monitors before upgrading.
Key differences
What changes
in daily use?
Where the apps differ most.
Both support laptop brightness; the beta adds gamma.
Both apps use DDC/CI on compatible external monitors and WMI on supported internal panels. Display Dimmer includes gamma dimming. Twinkle Tray stable 1.17.2 has no general gamma control, while 1.18.0-beta2 adds optional software brightness. Keep that prerelease difference in mind. [5] [11] [9] [17]
Both have profiles and idle dimming.
Twinkle Tray includes named brightness profiles, focused-app profiles and idle dimming for free. Display Dimmer Pro presets also save contrast and temperature, and can leave channels unchanged. Its All displays idle trigger is free; Pro adds targeted idle, lock, battery-power and low-battery brightness limits. [12] [2] [15] [16]
Twinkle Tray has a generous free feature set.
Twinkle Tray includes per-display schedules, hotkeys and linked brightness without a paid tier. Display Dimmer Free includes limited All displays schedules, app rules and hotkeys; Pro expands their number and scope, adds named display groups and removes the software-temperature preview limit. [1] [7]
Choose the controls that suit your monitors.
Twinkle Tray exposes supported monitor VCP controls in its interface and includes HDR SDR brightness. Display Dimmer offers software contrast and temperature, plus a Pro CLI and local API for presets, display state and advanced VCP commands. Neither app can add hardware capabilities your monitor lacks. [2] [4] [8]
Interactive preview
Try Display Dimmer for yourself.
Use the live preview below to see how the controls work. It changes only the simulated monitor; install the free app to test DDC/CI and software dimming on your own screens.
Sources & notes
Something changed? Let us know ↗Reviewed October 10, 2026 against Display Dimmer’s current app implementation and Twinkle Tray stable 1.17.2. The newer 1.18.0-beta2 prerelease adds optional gamma brightness and is identified separately in the table.
Official product documentation, tagged releases, settings and relevant issues were checked. “Not documented” means no equivalent built-in feature was verified; it does not rule out scripts or future releases. We have not benchmarked performance or tested compatibility across monitor setups.
View the 17 sources
- 01Twinkle Tray: official product site ↗Free pricing, hardware requirements, schedules and official project links.
- 02Twinkle Tray 1.17.2: settings and labels ↗Idle exclusions, lock-screen pause, hotkeys, linking and supported hardware VCP controls.
- 03Twinkle Tray 1.17.2: stable release ↗Stable baseline and current calibration/control changes.
- 04Twinkle Tray 1.17.0: HDR controls ↗Introduction of HDR SDR-content brightness and the lock-screen pause option.
- 05Twinkle Tray 1.17.2: README and CLI ↗DDC/CI, WMI and command-line brightness/VCP support.
- 06Twinkle Tray: MIT license ↗Application source license.
- 07Display Dimmer: Free & Pro ↗Free limits, Pro display targeting, software temperature and pricing.
- 08Display Dimmer: CLI / local API ↗Display state and brightness, contrast, temperature and VCP commands.
- 09Display Dimmer: DDC/CI vs gamma ↗Hardware and software paths, including HDR limitations.
- 10Twinkle Tray: display-detection troubleshooting ↗Connection and display-detection checks.
- 11Twinkle Tray 1.18.0-beta2: prerelease ↗Optional gamma brightness; separate from the stable comparison.
- 12Twinkle Tray 1.16.0: profiles ↗Release introducing brightness profiles and focused-app profiles.
- 13Twinkle Tray: battery-level automation request ↗Open battery/power-source automation request. Existing profiles and idle dimming are separate.
- 14Twinkle Tray 1.18.0-beta1: prerelease ↗Additional newer features, including ambient-light sensor support; not the stable baseline.
- 15Display Dimmer: presets guide ↗Save brightness, contrast and temperature per display; leave channels unchanged and recall setups.
- 16Display Dimmer: triggers guide ↗Temporary idle, lock, battery-power and low-battery brightness caps.
- 17Display Dimmer: laptop and monitor brightness ↗WMI for compatible internal panels; device and driver requirements.