This Hidden App Lets you Customise Your Samsung Galaxy Phone

Samsung has produced outstanding smartphones for many years.

Yet, the full potential of One UI is not always apparent in the system settings. Instead, it’s in an app that many Galaxy phone users overlook: Good Lock. Discover what this app offers, which modules are beneficial, and how to set up Good Lock.

What is Samsung Good Lock?

Good Lock is an official service by Samsung, providing a hub for a variety of add-on modules. Each module dives deep into specific aspects of One UI, including the lock screen, navigation, camera, notifications, and multitasking. This offers a level of customization once only possible with custom ROMs.

This app is entirely free, developed directly by Samsung, and is as secure as One UI itself.

Which Galaxy devices is Good Lock available for?

Good Lock is compatible with all Samsung Galaxy phones running One UI 6 or later. Specifically, these include:

• Galaxy S series: S23, S23, S23 Ultra, and newer models (including the S26 range)
• Galaxy Z series: Z Flip 5, Z Fold 5, and subsequent models
• Galaxy A series: Selected models with One UI 6
• Galaxy Tab: Tab S9 and newer versions

Good Lock is accessible through the Samsung Galaxy Store and, since late 2025, via the Google Play Store, eliminating previous country-specific restrictions. However, individual modules may still face regional limitations.

Important: Modules are not automatically installed. Users choose which modules to activate, saving storage and maintaining system organization.

How to install Good Lock

1. Open the Galaxy Store on your Samsung device (or the Google Play Store).
2. Search for “Good Lock.” Its icon is composed of four colored, interlocking jigsaw pieces.
3. Install and open the app.
4. Select the modules you want directly in Good Lock and download them by tapping the icon with a down arrow inside a box.

Tip: Avoid installing all modules simultaneously. Start with two or three that suit your specific needs.

How is Good Lock structured?

Good Lock serves as the command center. Once installed, it presents a straightforward interface with four sections:

• Make up: Modules for visual customization, covering themes, lock screens, and wallpapers.
• Life up: Modules for functionality and efficiency, including navigation, camera, multitasking, and audio.
• Clock: A distinct category for clock modules, such as ClockFace for the Always-On Display.
• Extensions: Additional modules available under both the ‘Make up’ and ‘Life up’ main categories.

Modules can be downloaded and installed directly from within Good Lock, bypassing the Galaxy Store. Currently, there are more than 20 modules available.

Theme Park

Theme Park is your entry point to visual personalization. This module lets you create unique themes: colors, icon shapes, background images, and fonts can be freely combined. Existing icon packs from the Play Store can be integrated and managed.

Since 2026, an AI theme generator has been available. Describe in text the appearance you desire, and the AI creates a matching color scheme, complete with icons and a background image.

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One-Handed Operation

If you own a Galaxy S Ultra or Z Fold, you may have noticed that one-handed operation can be tricky. One Hand Operation addresses this with six customizable Edge gestures (three per side). Each gesture is individually customizable: Back, App Overview, Screenshot, Torch, Notifications, and more.

This module enhances the standard navigation bar by adding extra swipe gestures.

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LockStar

The lock screen is the first thing you see when you pick up your smartphone, but One UI offers limited customization. LockStar significantly expands these possibilities. The WYSIWYG (what you see is what you get) editor allows you to drag the clock, date, widgets, and app shortcuts freely around the screen, both in portrait and landscape mode. You can hide any elements you dislike.

A particularly useful feature: LockStar unlocks app widgets on the lock screen that are otherwise restricted by Samsung. You can view your calendar, step counter, or weather forecast directly without unlocking your phone. App shortcuts can be placed as desired. Tapping the camera icon opens the camera without needing to unlock the device first.

New for 2026 are animated unlock effects. The ‘Swirl’ animation draws the lock screen inward upon unlocking, while other styles like ‘Curtain’, ‘Ripple’, ‘Mosaic’, or ‘Wave’ add a touch of visual flair to the unlocking process.

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MultiStar

MultiStar greatly enhances multitasking capabilities. Any app can be opened in split-screen mode or as a pop-up window, even if it does not officially support these features. New for 2026, app pairs on the home screen launch two apps simultaneously in split-screen mode.

For foldable devices, MultiStar manages how apps transition between the cover and main screens when the device is opened and closed. It also enables any app to run on the Z Flip cover screen, which is disabled by default.

Samsung DeX users gain advantages like higher resolutions or running more than five apps simultaneously on a connected display.

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RegiStar

RegiStar caters to users who find the standard button and gesture navigation options insufficient.

The most notable feature is the Backtap gesture: tapping the back of your smartphone twice opens a chosen app or function (such as the torch, a screenshot, or Expert RAW). If the power button is dedicated to Gemini or the camera, Backtap offers a convenient third control option that is completely invisible.

Additionally, RegiStar enables you to remap the side button: double-taps and long presses can be independently linked to specific actions. If desired, a long press can directly open a particular app instead of launching the voice assistant.

Another useful feature is the ability to reorganize the One UI settings menu. Unnecessary sections can be hidden, while frequently used ones can be moved to the top. The built-in settings history logs all recent system changes.

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NavStar

The navigation bar is a daily element, but One UI offers little opportunity for customization. NavStar changes this by enabling users with classic button navigation to freely adjust the layout, order, and color of buttons, alter the background color of the bar, and add an extra button to hide the bar if needed.

For those using swipe gestures, NavStar allows independent adjustments to sensitivity and active areas for the left and right sides. This is useful if, for example, you want more space on the left for the ‘Back’ gesture. You can also decide whether the line at the bottom of the screen remains visible or fades away.

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Camera Assistant

Camera Assistant unlocks hidden camera features. On the Galaxy S26 range, it activates the 24-megapixel mode, which uses AI fusion processing for sharper images than 12 MP and smaller file sizes than 50 MP, offering a balanced option for everyday use. Additional features include:

• Focus peaking in Pro mode highlights areas in focus with color, aiding manual focusing
• Interval burst mode allows timed bursts of shots, useful for time-lapse sequences
• Auto HDR activates automatically when the camera detects significant brightness differences
• Automatic lens selection lets the device choose the optimal lens based on the subject and zoom level
• The Astro Mode shortcut provides direct access to night photography mode
• Custom resolution presets let you save preferred megapixel settings for quick switching

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NotiStar

Notifications often disappear quickly—sometimes too quickly. NotiStar addresses this by providing a comprehensive notification history that stores all incoming messages until you delete them. Even accidentally dismissed notifications can be reviewed anytime.

NotiStar also offers a personalized filtering function: you can specify which apps should send notifications and which should not. Keyword filters refine this further: you can configure it so that you’re only notified by a specific app if the message contains certain words, like ‘invoice’ or ‘appointment’. Notifications that don’t match the filter criteria are ignored or simply stored in the history without alerting you.

NotiStar is also useful for the lock screen, allowing you to control what is visible on the locked display. In February 2026, Samsung enhanced the module with an updated notification management system, further improving the overview across multiple apps.

Other recommended modules

• Home Up: Customize the launcher, including grid size, app drawer, and share menu
• Keys Cafe: Adjust keyboard layout, effects, and sounds
• QuickStar: Add or remove status bar icons; access Quick Settings directly
• Routines: Advanced Bixby automations with touch macros and app-based triggers
• Wonderland: Dynamic parallax wallpapers with motion effects
• ClockFace: Customizable clock for the Always-On Display and lock screen
• Game Booster: Gamepad touch mapping, CPU clock speed limit, game intro fast-forward
• Pentastic: S Pen pointer styles and Air Command customizations (for S Pen devices)
• Nice Catch: System log for notifications, vibrations, and settings changes