The Guide To Progressive Web Applications

Progressive Web Apps (PWA) is one of the prominent applications in web development as they carry mobile-app-like experiences to the users without expecting them to install an app from the App store or Play store.

The “progressive” part implies they’re “progressively enhanced” with present-day web features, which implies they’ll likewise work in older browsers that don’t hold the new features, yet will work well with extra features in latest browsers.

PWAs are not like Google’s Chrome Packaged Apps or Microsoft’s Hosted Web Apps. Those require the application to be “packaged” as a file and submitted to an App store. The whole application lives in a small offline package, and clients have to install it from either the Chrome Web Store or Windows Store. These were additionally platform-specific and just work on Chrome or Windows. The developer needs to change the offline app’s files and present another version to the App store to update it.

The most vital and apparent advantage is that developers will never again need to build up multiple apps over multiple mobile platforms. Even for those who build up only for iOS and Android, this means massive savings in app development time and effort. PWAs give the guarantee of being able to develop a single app and have it work completely across all your platforms and devices.

On the off chance that you have a look at the apps installed on your mobile right now, there are a dozen apps that you don’t utilize regularly. Sometimes apps only work well when the phone has an active internet connection.

The irony is that a greater part of the applications has a completely responsive website performing the similar functions. So why misuse your precious disk space and your internet data on your cell phone by installing the native app?

The normal size of applications that we install from Play store/App stores would go from 30–200MB. In addition, these applications need to be updated every week. But PWA’s are within a few KBs and are automatically updated.

PWA vs. Mobile Website

PWAs are a hybrid of native applications and mobile websites,yet how would they vary from responsive sites? In contrast to “old fashioned” mobile websites, PWAs are quicker. Note that 53% will abandon a site on the off chance that it takes longer than 3 seconds to load. PWAs load rapidly, regardless of network state and give quick-to-respond interfaces. This wipes out their dependence on the system as mobile websites do, guaranteeing an instant and reliable experience for users. A PWA likewise updates in the background, so users never need to wait for a fresh content to load.

Moreover, traditional mobile websites revolve around static information, while PWA’s can furnish users with dynamic functionality. PWAs present an immersive full-screen experience, permitting customers to place mobile food orders, take an interest in a loyalty program and contact a business. It can likewise reconnect users with web push notifications like native push notifications.


There are a number of key principles a web app must acquire to be identified as a PWA. They are:

  • Discoverable: The contents can be discovered through search engines.
  • Installable: It’s accessible on the device’s home screen.
  • Linkable: You can share it by sending a URL.
  • Network independent: It performs offline or with a poor network connection.
  • Progressive: It’s still functional on a fundamental level on older browsers, yet fully-functional on the recent ones.
  • Re-engage able: It can send notifications every time there’s the latest content available.
  • Responsive: It functions on any device having a screen and a browser such as mobile phones, laptops, tablets, TVs etc.
  • Safe: The association between you and the app is protected against any third parties trying to get access to your sensitive data.


The PWA has a simple structure. It comprises of the app shell and the evolving content. The app shell is the HTML, CSS and JavaScript code which make the interface of the app. The interface is a static piece of the application, it can dynamically show the content. The app shell is cached on to the device of the user and can be loaded directly.

The content is the dynamic part. It varies and is refreshed each time when a connection with the internet is established. There is another technology that enables us to define a PWA, the service worker.

The service worker is a JavaScript file that functions in the background. It is in charge of the offline functionality of the PWA through timely content caching. Likewise, vital is the app manifest, a simple JSON file assists the device to know the PWA and defines how it will be shown on the screen.

The Web App Manifest

The Web App manifest contains a JSON file which is the main part that gives the dynamic native app interface appearance. With the manifest, a developer can manage the way an app is shown to the user (a full-screen mode without visible URL bar) and how it is to be launched. The record enables a developer to locate a centralized place for the web app’s metadata. The manifest typically includes starting URL, an app’s full and short name, links to icons and icons’ sizes, type, and location. A developer can likewise characterize a splash screen and a theme color for the address bar.

Service Worker

A service worker is another technical component that supports one of the principle features of progressive web apps; the offline work mode, background syncs, and push notifications normal for native apps. The service worker is a JavaScript file running independently from the web page/application. It reacts to client interactions with the app, including network requests produced using pages it serves. Since the service worker runs just to process a particular event, its lifetime is short.

  1. Offline work mode: The service worker considers for caching an app shell(interface), so it loads quickly on repeat visits. The vital dynamic content (i.e. message or payment history, shopping cart etc) is revived each time the connection is back. These mechanics permits for decent app execution and enhanced user experience. For instance, a messenger user won’t see the dissimilarity between the online and offline modes with respect to interface: It still works; a message history is accessible. However, messaging requires connection.
  2. Push notifications: Push notifications are a brilliant tool for client re-engagement through the content and quick updates from websites they like. Progressive web apps can send push notifications even though the browser is closed and the app isn’t active.
  3. Background synchronization: The service worker is likewise in charge of this feature. It hold-up actions until a steady connectivity is back. For instance, the message sent just before the connection fails will be recorded as sent and then will be provided as soon as the service is replaced. Thus, servers can send regular updates to the app enabling it to update itself when the connection is restored.

The Application Shell Architecture

Building and keeping up PWAs involve isolating static content from dynamic content. Thus, the utilization of the application shell architecture (the base of the UI) mentioned is the main approach to their development. The app shell comprises of core design elements required to make the application keep running without the connection. The app shell approach works well for JavaScript-heavy apps consisting of one page and apps with moderately stable navigation and evolving content.

Transport Layer Security (TLS)

PWAs support the Transport Layer Security (TLS) protocol. TLS is the standard of secure and robust data interchange between two applications. The integrity of the data needs presenting the website via HTTPS and installing an SSL certificate on a server.


There are numerous explanations for utilizing a PWA. However, here are the best capabilities it provides:


PWAs give experiences that are reliably quick. From the minute they begin connecting with it, everything happens extremely fast. Since you can cache the data, it is quick to begin the application again even without hitting the network.

Integrated User Experience

PWAs sense and act like native apps. They sit in a user’s home screen, send push notifications like native apps, and approach a device’s functionalities like native apps. The experience feels consistent and integrated.

Reliable Experience

With the assistance of service workers, we can dependably paint a photo on a client’s screen even when the network has fizzled.


Because we can send warnings to a user, we can truly drive the engagement up by keeping the user informed and engaged with the app.

The Future

At the point when native apps initially came to the market, people couldn’t get most of them. It changed the manner in which buyers interact with their mobile devices and with brands. The ongoing pattern, in any case, demonstrates that individuals are distancing themselves from apps. So all together for a native app to be successful, it should be exceptional, which is a tall demand for a business app.

While presented in 2015, PWAs have picked up popularity over the years. Google, Apple and Microsoft, the three fundamental standards in terms of native app distribution are all driving the change to PWAs. In light of their inherent flexibility, PWAs is one of the most ideal approach to remain on top of things in the mobile industry. From Twitter to Starbucks, PWAs are showing that any business can make huge increases with this innovation. Clients of Pinterest’s PWA invest 40% more time on the site compared to the previous mobile website. Their Ad income rates also expanded by 44%, and core engagements shot up 60%.

PWAs have kept running in a safe container available to anybody on the web utilizing their mobile Chrome browser. If you are looking for a progressive web application, you’ve come to the right place. Contact us to get your free business consultation.

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