Every year new app launched some of them is on the top of the App list. Top 8 apps  and service launched in 2019.

Google Stadia

Stadiais a cloud gaming service  by Google. It is advertised to be capable of streaming video games up to 4K resolution at 60 frames per second with support for high-dynamic range, to players via the company’s numerous data centers across the globe, provided they are using a sufficiently high-speed Internet connection. It is accessible through the Google Chrome web browser on desktop computers, or through smartphones, tablets, smart televisions, digital media players, and Chromecast.The service is integrated with YouTube, and its “state share” feature allows viewers of a Stadia stream to launch a game on the service on the same save state as the streamer. This has been used as a selling point for the service.

Photoshop for iPad

Photoshop now goes wherever with features reimagined just for iPad. The app is compatible with most current iPad models running iPadOS. If you already have an Adobe Creative Cloud subscription, Photoshop for iPad is already a part of your package.

Work with Layer stack and Toolbar tools just like desktop. Swipe, pinch, tap, scribble, slide feel closer to work than ever before. And with the context-aware UI, only the core tools and panes are displayed, It’s simple to keep your PSDs in sync across devices.Documents are automatically saved to Adobe’s cloud as work and available on any device running Photoshop.

Next-generation Google Assistant

The next-generation Google Assistant up to 10 times faster, while running locally on a user’s phone. Google Assistant can also do multiple tasks at once. The next-generation Google Assistant first arrived on Pixel phones and is expected to roll out to other smartphones later next year.

Sign in with Apple

Sign in with Apple is built from the ground up to respect your privacy and keep you in control of your personal information. At your first sign in, apps and websites can ask only for your name and email address to set up an account for you. Apple’s private email relay service to create and share a unique, random email address that forwards to your personal email. That way you can receive useful messages from the app without sharing your personal email address. Only the registered app or site developer can communicate with you using this email, and you can turn it off at any time.Sign in with Apple button on a participating app or website, it means you can set up an account and sign in with your Apple ID. Instead of using a social media account, or filling out forms and choosing another new password, just tap the Sign in with Apple button, review your information, and sign in quickly and securely with Face ID, Touch ID, or your device passcode.

iPadOS

iPadOS is a mobile operating system created and developed by Apple Inc. for their iPad line of tablet computers. The successor of iOS 12 on iPad, it was announced at the company’s 2019 Worldwide Developers Conference (WWDC).iPadOS features a multitasking system developed with more capabilities compared to iOS, with features like Slide Over and Split View that make it possible to use multiple different applications simultaneously. Double-clicking the Home Button or swiping up from the bottom of the screen and pausing will display all currently active spaces. Each space can feature a single app, or a Split View featuring two apps. The user can also swipe left or right on the Home Indicator to go between spaces at any time, or swipe left/right with four fingers.

Noise app on Apple Watch

The Noise app monitors ambient sound levels around you and drops a notification if you’re exposed to ‘repeated, long-term’ loud sounds. This could help prevent hearing loss in the long term. The app uses the microphone present in the Apple Watch to monitor ambient noise. Users can select a noise threshold to receive relevant warnings.

Cycle Tracking on Apple Watch

The Cycle Tracking app  to log details about your menstrual cycle. You can add flow information and record symptoms such as headaches or cramps. Using information you’ve logged, the Cycle Tracking app can alert you when it predicts that your next period or fertile window is about to start.

Apple Arcade

Apple Arcade is a video game subscription service by Apple Inc. for iOS, iPadOS, tvOS, and macOS devices.

• Users can carry over in-game progress between all devices linked to the same iCloud account.
• No ads, in app purchases, always on DRM, or data tracking.
• Up to six family members are allowed access through family sharing.
• Various game controllers are supported, such as the DualShock 4 and Xbox One controllers.