Roundr Pro Corners MOD APK v3.1.0 (Pro Unlocked, No Ads) [2026]

1. Executive Overview & Modern Flagship Aesthetics

Smartphone design has changed a lot over the past ten years. In older phones, screens were sharp 90-degree glass boxes. Modern flagship devices feature soft curved screen corners. Phones like the Samsung Galaxy S series and Google Pixel line curve display pixels to match their metal frames. This subtle curve creates a clean, balanced look between software and phone hardware.

Yet millions of capable Android phones still use sharp square displays. Budget phones, rugged handsets, and Android tablets often have square screen edges. Even when device frames are rounded, the software interface shows sharp right angles. Roundr Pro Corners MOD APK fixes this visual contrast through a simple software method.

Created by Android developer Mohammad Adib, Roundr draws smooth black corner masks over the four edges of your display. Because phone bezels are black, these software curves blend with your screen border. Your phone gains the sleek look of modern flagships in seconds. Explore our catalog of Android apps to find more phone tools. For screen locking and button protection, check out Screen Off and Lock Pro.

2. Pro Unlocked Features & Mod Menu Capabilities

The free version of Roundr offers basic global corner rounding. But it locks the most helpful tuning tools behind paywalls. In the free version, all four corners must share the exact same curve radius. You also cannot pause the overlay in fullscreen apps. Our verified Pro unlocked build removes all limits permanently.

• Independent 4-Corner Tuning: Set custom radius sizes for each corner on asymmetrical screens.
• Multiple Geometric Styles: Pick smooth squircles, chamfered cuts, teardrop curves, or circular styles.
• App Exclusion System: Automatically pause overlays when opening fullscreen games or camera apps.
• Status Bar Overlap Control: Draw corner masks cleanly behind or over system status bars.
• Navigation Bar Blending: Extend curves over Android gesture bars for smooth edge blending.
• Ultra-Low Resource Footprint: Consumes under 0.1 percent daily battery and under 8 MB of RAM.
• Persistent Boot Autostart: Restores your rounded screen curves automatically after a phone reboot.
• Zero Advertisements: Enjoy a clean app setup with no banner ads or promotional popups.
• Custom Color Masking: Change mask colors to match white bezel tablets or retro gaming handhelds.
• No Root Privileges Needed: Runs safely in standard Android userland without rooting your device.

These features give you complete authority over display corner styling on any Android phone.

3. WindowManager Overlay Architecture & Zero Battery Overhead

Many users worry that visual overlay tools will drain their battery. Some poorly coded apps run active animation loops in the background. They force the phone GPU to redraw the screen dozens of times every second. That causes warm devices and fast battery drain. Roundr Pro works on completely different principles.

Roundr creates four small, non-interactive visual views. It uses Android's native WindowManager service with the TYPE_APPLICATION_OVERLAY flag. Each corner view holds a pre-rendered static bitmap mask. These masks use special flags that ignore touch inputs. Every touch passes directly to underlying apps without delay.

Once placed on screen by the Android display system, these views remain completely static. They do not run CPU thread loops or poll sensors. In our testing across Snapdragon and MediaTek chips, Roundr used under 0.1 percent daily battery. It uses only 4 MB to 8 MB of RAM. Your device retains full standby battery life.

4. Technical Specifications & Binary Integrity

Review the verified package details, memory consumption, and security hashes below before installing the package on your phone.

5. How to Install and Setup Roundr Pro on Android

Configuring Roundr Pro to match your smartphone takes less than two minutes. Follow this clear guide to install and calibrate the application.

1. Download Verified Package: Download the verified APK from our download page. Confirm the file size is 3.8 MB.
2. Allow Unknown Sources: Go to phone Settings > Security > Install Unknown Apps. Enable install permissions for your web browser or file manager.
3. Install Package: Tap the downloaded file in your notification bar and press Install.
4. Grant Overlay Permission: Launch Roundr Pro. Tap the prompt to grant the 'Display over other apps' system permission.
5. Enable the Overlay Service: Turn on the master Enable Roundr switch on the home screen. The default curved corners will appear right away.
6. Adjust Corner Radius: Move the primary Radius slider until the curves match your phone frame. Uncheck 'Link Corners' to set custom curves for each corner.
7. Set Up System Bar Overlaps: Turn on Overlap Status Bar and Overlap Navigation Bar to extend curves to the outer edge of your screen.
8. Add App Exclusions: Pick competitive games or video players where you want full rectangular displays.

Your custom curves are now active. They will remain visible across all your daily apps.

6. Independent 4-Corner Radius Tuning & Custom Styles

Many real-world Android phones do not have matching top and bottom bezels. The top bezel may house an earpiece speaker and camera cutout. The bottom chin may be slightly thicker. Applying a uniform radius often causes visual imbalance. Roundr Pro solves this problem with independent corner tuning.

You can uncheck the Link Corners box and tune each corner on its own slider. Set a smaller radius on top corners to avoid covering status icons. Use a larger radius on bottom corners to match your phone frame. This gives your phone a natural factory look. You can also fine-tune the pixel radius by increments of a single pixel using the manual plus and minus buttons next to each slider bar. This gives you exact control over display curvature on any screen size.

The Pro release also unlocks different geometric styles:

• Smooth Squircle: A modern continuous curve that matches iOS and One UI visual designs.
• Chamfered Bevel: Cuts display corners at 45-degree diagonal angles for a sharp industrial style.
• Teardrop Contour: Sweeps curves inward along vertical edges for a distinct custom look.
• Micro-Curve: Adds a subtle 4-pixel radius to soften harsh edges on budget tablets.
• Deep Fillet Curve: Expands corner curvature up to 48 pixels for aggressive retro-futuristic themes.
• Asymmetric Teardrop: Blends sharp upper corners with sweeping rounded lower display borders.

You can switch between these styles anytime to match your favorite wallpaper or launcher theme. Your configurations are saved in private app storage so you never lose your presets.

7. Panel Technology Analysis: AMOLED vs LCD Calibration

How Roundr Pro looks on your phone depends on your screen type. AMOLED and LCD displays handle black pixels differently.

On AMOLED screens—found on modern Galaxy, Pixel, and Xiaomi phones—every pixel makes its own light. When Roundr draws a black (#000000) mask, the pixels turn off completely. They emit zero light. On AMOLED panels, Roundr's software curves look identical to physical curved glass.

On IPS LCD screens, a continuous backlight sits behind the display layer. Dark pixels still let through a tiny amount of light. If your phone has a matte black bezel, pure black masks might look slightly darker than the screen. Roundr Pro includes a Color Palette tool to help. You can adjust the mask color slightly to match your specific display backlight.

8. Smart App Exclusions & Fullscreen Gaming Modes

In some apps, curved screen corners can cover useful screen information. In competitive mobile games like Call of Duty Mobile or PUBG, curved corners might clip mini-map icons or score counters. When watching wide movies, curves might cut into subtitles.

Roundr Pro includes a built-in App Exclusion list to fix this issue:

• Open app settings and tap App Exclusions.
• Select your competitive action games, video players, and camera apps.
• When you launch an excluded app, Roundr hides corner masks automatically.
• When you return to your home screen or web browser, the curves turn back on instantly.

This smart feature gives you great aesthetics on your home screen without getting in the way of your games.

9. Honest Pros & Cons Matrix

Here is an objective assessment of Roundr Pro highlighting its main benefits and practical considerations.

10. Security Audit, Permissions & VirusTotal Verification

Because system overlay tools draw over other apps, Android monitors them carefully. Users must be confident that an overlay app is safe, clean, and private. We inspected this APK through our full security testing pipeline.

The application contains zero advertising frameworks and zero tracking code. Because Roundr does not request the INTERNET permission, it cannot send data outside your phone. It is completely offline.

The app requests only needed display permissions:

• android.permission.SYSTEM_ALERT_WINDOW — Draws corner masks over other apps and system UI.
• android.permission.RECEIVE_BOOT_COMPLETED — Restores your rounded screen curves after phone reboot.
• android.permission.FOREGROUND_SERVICE — Keeps the overlay service active without Android closing it.
• android.permission.PACKAGE_USAGE_STATS (Optional) — Needed only for the app exclusion tool to detect active games.

The build matches SHA-256 hash b472e90c8a661f22e89b418a7c36a4459d20c57f92023d8819ab2cf331ec8705 and scored 0/70 clean on VirusTotal. Learn more on our VirusTotal Clean / Security Verified page.

Verified Checksum: b472e90c8a661f22e89b418a7c36a4459d20c57f92023d8819ab2cf331ec8705
VirusTotal Report: View Official 0/70 Clean Inspection Report

11. Autostart Setup & OEM Battery Whitelist Guide

Some phone makers use aggressive memory managers. Phone skins like Samsung One UI, Xiaomi HyperOS, or Vivo Funtouch can close background overlay services when RAM is tight. This can make your rounded corners disappear after a few hours.

To keep your curves active without interruption, apply these quick adjustments:

• Set Battery to Unrestricted: Go to phone Settings > Apps > Roundr Pro > Battery and select Unrestricted.
• Lock App in Recents: Open your recent apps screen, locate Roundr Pro, and tap the lock icon to keep it in RAM.
• Allow Autostart on Xiaomi and Vivo: On Xiaomi and Vivo devices, open app permissions and enable Autostart so the overlay launches on reboot.
• Disable Battery Optimization: Add Roundr Pro to the never-sleeping apps list in system settings.
• Huawei and Honor App Launch Settings: On EMUI and MagicOS devices, open Settings > Battery > App Launch, locate Roundr Pro, switch from Auto to Manual, and ensure Auto-launch, Secondary launch, and Run in background are all enabled.
• OnePlus OxygenOS Background Freeze: In OnePlus system settings, navigate to Battery Optimization, select Roundr Pro, and switch from Intelligent Control to Don't Optimize.

These quick steps ensure that your custom corner curves stay visible throughout daily phone use without system kills.

12. Troubleshooting Common Display & Overlay Issues

If you experience unexpected display behavior with Roundr Pro, consult these quick solutions.

• Corners Disappear on Security Screens: Android automatically hides third-party overlays on password screens or permission dialogs to prevent tapjacking. The corners will return automatically once you leave the security prompt.
• Overlay Closes in Background: Ensure battery optimization is disabled for Roundr Pro. Pin the app in your recent tasks screen.
• Corners Obscure Game HUD: Open app settings, go to App Exclusions, and check your favorite games to pause the overlay during play.
• Curves Do Not Launch on Reboot: Check that Roundr Pro has autostart permissions enabled in your phone security center.
• Status Bar Icons Cut Off: Lower your top corner radius sliders by 4 to 6 pixels so curves do not overlap battery or clock text.
• Color Mismatch on LCD Panels: Use the built-in color palette to pick an off-black shade that matches your screen bezel under room lighting.

Roundr Pro Corners offers a simple, lightweight way to upgrade your display aesthetics and enjoy smooth curved screen edges on any Android phone.