<h1><img alt="" src="https://cdn-images-1.medium.com/max/800/1*QzoL4Wizr7eM48sIq7Qo0Q.jpeg" title="Image: https://cdn-images-1.medium.com/max/800/1*QzoL4Wizr7eM48sIq7Qo0Q.jpeg" style="font-size: 14px; font-weight: normal;"><br></h1><span><br></span><span><br>B</span>y now, you have probably heard that Progressive Web Apps are the future of the WEB. It might even push the mobile web forward and help mobile developers reach more users.<br><br><span>That sounds great but what exactly&nbsp;are&nbsp;Progressive Web Apps?<br><br></span><span>According to google Progressive Web Apps are experiences that combine the best of the web and the best of apps. It uses modern web capabilities to deliver an app-like user experience.<br><br></span><h3>Progressive Web Apps&nbsp;Benefits</h3>Offline availability.<br>Singular code base to maintain.<br>Behaves like an app, but built with web technologies.<br>Allows businesses to bypass the approval processes that govern app marketplaces.<br><span>Teams can design beyond iOS or Material Design standards.<br><br>In my opinion, Progressive Web Apps are the single biggest thing to happen on the mobile web since Steve introduced the iPhone.<br>&nbsp;Henrik Joreteg,&nbsp;<a href="https://twitter.com/henrikjoreteg" target="_blank" rel="nofollow noopener">Twitter: @HenrikJoreteg</a><br><br>Large sites like&nbsp;<a href="https://twitter.com/" target="_blank" rel="nofollow noopener">twitter.com</a>, who recently shipped 100% of their mobile web traffic to their Progressive Web Apps with Service Worker, an&nbsp;<a href="https://developers.google.com/web/fundamentals/architecture/app-shell" target="_blank" rel="nofollow noopener">Application Shell architecture</a>&nbsp;and the&nbsp;<a href="https://developers.google.com/web/fundamentals/performance/prpl-pattern/" target="_blank" rel="nofollow noopener">PRPL pattern</a><span>&nbsp;are also seeing similar wins<br></span><br></span><h3>Why Progressive Web&nbsp;App?</h3><span>Progressive Web App is progressive as it works for every user, regardless of device choice. It is responsive because it fits on in any screen factor mobile, tablet etc. Connectivity independent thanks to service workers to work the Progressive Web App offline. It behaves as an app, because the app shell model separates the application functionality from application content. It is up-to-date due to the service worker update process. It served via HTTPS. Thanks to W3C manifest and service worker registration scope, allowing search engines to find it as an application. It can easily share with a URL, doesn’t need installation. It has feature like push notifications. It can be add as an app in the mobile home screen.<br></span><br><h3>Service Workers</h3>Service Worker is a JavaScript file that runs in browser’s background separately from the web. It powers the offline functionality, push notifications, background content updating, content caching and a whole lot more. Service worker life cycle mentioned beloww.<div><div><div><div></div><div><img alt="" src="https://cdn-images-1.medium.com/max/800/1*3b8ERTlwtG6iBDeRxLQJNw.png"></div></div></div></div><span><div></div><div><div><blockquote>Service Workers are about&nbsp;<a href="https://infrequently.org/2016/05/service-workers-and-pwas-its-about-reliable-performance-not-offline/" target="_blank" rel="nofollow noopener">Reliable Performance</a>. Not just “Offline Support” — Alex Russell,&nbsp;Chrome</blockquote></div></div></span><br><h3>Installation and App&nbsp;Manifest</h3><h3><div><div></div><div><img alt="" src="https://cdn-images-1.medium.com/max/800/1*OnteLuUjIol8B3rQLmhUPw.jpeg"></div></div><br></h3><span>Like a native app Progressive Web App has its own manifest File The web app manifest is a simple JSON file that gives you, the developer, the ability to control how your app appears to the user. Historically, mobile web apps were not installed like an app. This is changing now recently chrome on Android added support for installing web apps to the mobile home screen with a native install banner, just like the native app banners we’re used to. To tell Chrome our mobile website is install-able as an app, we write a manifest.json file and link to it from our main HTML page and make our Progressive Web App install-able.<br></span><br><h3>Case Studies</h3><span>These are some of the case studies that google also do share on its&nbsp;<a href="https://developers.google.com/web/showcase/2017/mynet" target="_blank" rel="nofollow noopener">site</a>. There are some mind blowing results of Progressive Web App.</span><blockquote>Mynet speeds up their mobile web experience by 4X, increasing revenue by 25% with AMP-based Progressive Web Apps.</blockquote><blockquote>OLX boosts re-engagement on the mobile web by 250% with a Progressive Web App.</blockquote><blockquote>Alibaba 76% higher conversions across browsers, 14% more monthly active users on iOS, 30% on Android and 4X higher interaction rate.<br><h3>Conclusion</h3>If you are targeting billions of users and a product that run on desktop, mobiles, tablets etc you need to build a Progressive Web App. Progressive Web Apps are big change in world of web apps. It smarts the traditional webs. It nearly approaches the native app behavior with the features of fast response, push notification functionality and installation ability.</blockquote>

An Intro to Progressive Web Apps

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