Cool CallScreen-Birthday Theme is a call screen customization app designed to help you personalize your incoming call interface with fun birthday-themed visuals. It's a relatively new app that launched earlier this year, and you can find it on both Google Play and the App Store. It has a growing number of downloads, and the best part is it's completely free to install. You don't even need to register an account to start using it, which makes getting set up super quick. I haven't run into any annoying ads while using it, and there are no in-app purchases to worry about, so everything you see is available from the moment you download it.

Using the app is straightforward. After you install it from Google Play, you just open it and browse through the collection of birthday-themed call screens. There are designs with balloons, cakes, confetti, and festive colors. You tap on the one you like, and the app applies it. A simple tip from a regular user: sometimes your phone's default settings might block third-party call screens, so if it doesn't work immediately, check your phone's 'Default call screen' settings in the system menu and select this app. I use it to make birthday calls from friends and family more fun. It's a small touch, but it adds a bit of celebration to a simple phone call.

Compared to other call screen apps, Cool CallScreen-Birthday Theme is much more focused. Most similar apps, like 'Call Screen Themes' or 'Color Call Screen', try to offer hundreds of generic themes for all occasions. This app does just one thing—birthdays—and it does it well. The themes feel more thoughtfully designed for the occasion. I chose it over others because I wanted something specific for a birthday month, not a cluttered app with themes I'd never use. It's simpler and feels less bloated. For a free, no-fuss way to decorate your calls for a party, it's a solid choice.

• 🎂 Applies fun birthday themes like cakes and balloons directly to your incoming call screen, making routine calls feel festive.
• 🎂 One-tap setup from within the app is faster than similar apps that require navigating complex theme stores or editors.
• 🎂 Completely free with no registration, unlike many competitor apps that lock the best themes behind a paywall or login.
• 🎂 Focused solely on birthday content, offering more cohesive and festive designs than broader call screen apps with scattered themes.

• 🎈 The birthday-specific designs are more vibrant and detailed than the generic party themes in other all-in-one call screen apps.
• 🎈 Being totally free with no ads is a huge plus compared to similar apps that interrupt you with frequent video ads.
• 🎈 It's incredibly lightweight and installs quickly from Google Play, unlike some bulkier theme apps that take forever to download.

• 🎁 The theme selection is still small compared to massive theme libraries in apps like Zedge, so variety is limited.
• 🎁 Compatibility can be spotty on some phone models, a common issue with call screen apps that isn't fully solved here.