An Introduction to Progressive Web Apps

Progressive Web Apps
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To take advantage of both web and native app functionality, PWAs are web apps built using various unique technologies and standard patterns. For instance, Web apps are more discoverable than native apps; visiting a website is much simpler and quicker than downloading an application, and by submitting a connection, you can even share web apps. Native applications, on the other hand, are better integrated with the operating system and thus provide users with a more seamless experience. You can install a native app to function offline, and users enjoy clicking their icons to access their favorite apps quickly, rather than using a browser to navigate to them.

PWAs give us the ability to create web apps that can enjoy these same advantages.

What makes an app a PWA?

As we suggested above, with a single technology, PWAs are not generated. They reflect a modern paradigm for developing web apps that includes some basic patterns, APIs, and other features. It’s not that clear whether, at first glance, a web app is a PWA or not.

Furthermore, such as Lighthouse, there are tools to calculate how full a web app is (as a percentage). We can make an app more progressive by introducing different technical advantages, thus ending up with a higher Lighthouse ranking. This is, however, just a rough measure.

A web app should aim to follow certain fundamental principles to be known as a PWA, and these include:-

  1. Discoverable so that the contents can be found through search engines.
  2. Installable so that it can be available on the home screen or app launcher of the user.
  3. Network independent, so that users can use it offline as well as if the connection is poor.
  4. Progressive, so it’s still usable on a fundamental level on older browsers but fully-functional on the latest ones.
  5. Re-engageable, so it can send updates whenever new content is available.
  6. Safe, so that communications are protected between the user, the app, and your server against any third party attempting to access sensitive data.

Advantages of web applications

A fully-capable progressive web application should provide all of the following advantages to the user.


The ultimate goal is that web apps should have better search engine representation, be simpler to expose, catalog and rank, and have browser-usable metadata to give them unique capabilities.


For users to have app icons on their home screen and to be able to tap to open apps in their native container that feels nicely integrated with the underlying platform is a vital part of the web app experience.


The ability to connect to an app at a specific URL without the need for an app store or complicated installation process is one of the most powerful web features. This is how it always was.

4.Network independence

When the network is unreliable, or even non-existent, modern web apps can run. The fundamental ideas behind network autonomy are to be able to:

  1. Revisit a site and get its contents even if no network is available.
  2. Control what is shown to the user in situations where there is no connectivity.


The ease with which users can be re-engaged by updates and new content, even when they are not looking at the app or using their devices, is a significant benefit of native platforms. Using emerging technology such as Service Workers to manage pages, the Web Push API to send updates directly from server to app through a service worker, and the Notifications API to produce system notifications to help engage users while they are not actively using their web browser, modern web apps can now do this too.


Sensitive web apps use media queries and viewports to ensure their UIs suit any form factor: desktop, mobile, phone, or whatever comes next.


As long as you take advantage of HTTPS and create your applications with protection in mind, the web platform offers a secure distribution mechanism that avoids snooping and ensures the content has not been tampered with.

It’s also simple for users to ensure that the correct app is enabled since its URL will fit your site’s domain. This is somewhat different from apps that may have a range of similarly-named apps in app stores, some of which may even be based on your platform, which adds to the confusion. Web apps remove the uncertainty and make sure consumers get the best experience possible.

Browser support

As stated before, PWAs do not rely on a single API but instead, use different technologies to provide the best possible web experience. Service worker support is the main ingredient needed for PWAs. Thankfully, all big desktop and mobile browsers are now supported by service staff.

There is also broad support for other features, such as Web App Manifest, Push Notifications, and Add to Home Screen functionality. Safari currently has minimal help and no support for mobile push notifications for Web App Manifest and Add to Home Screen. Other major browsers, however, support all these characteristics.

Above all, the progressive enhancement rule should be followed: use technology that boosts your app’s appearance and utility when it is available, but still provide your app’s basic functionality when those features are unavailable. The use of these changes results from presenting a trusted website with good performance; this, in turn, means creating web apps that meet best practices. Everyone can use the app this way, but those with modern browsers can benefit even more from the PWA features.

An example application

Today INRXRATE for currency conversion is one such web application that is truly modern and is a progressive web app. In this web application, you will find many features that will help you know the best currency conversion rates. You can get the live and most accurate rates in this web application for free.

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