A progressive web application (PWA), or progressive web app, is a type of application software delivered through the web, built using common web technologies including HTML, CSS, JavaScript, and WebAssembly. It is intended to work on any platform with a standards-compliant browser, including desktop and mobile devices.

Since a progressive web app is a type of webpage or website known as a web application, it does not require separate bundling or distribution. Developers can simply publish the web application online, ensure that it meets baseline installation requirements and that users will be able to add the application to their home screen. Publishing the app to digital distribution systems like Apple App Store or Google Play is optional.[1]


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In 2015, designer Frances Berriman and Google Chrome engineer Alex Russell coined the term "progressive web apps"[15] to describe apps taking advantage of new features supported by modern browsers, including service workers and web app manifests, that let users upgrade web apps to progressive web applications in their native operating system (OS). Google then put significant efforts into promoting PWA development for Android.[16][17] Firefox introduced support for service workers in 2016, and Microsoft Edge and Apple Safari followed in 2018,[18][16] making service workers available on all major systems.

Since a progressive web app is a type of webpage or website known as a web application, they do not require separate bundling or distribution. In particular, there is no requirement for developers or users to install web apps via digital distribution systems like Apple App Store, Google Play, Microsoft Store, or Samsung Galaxy Store. To varying degrees, the major app stores support the publication of PWAs.[1] Google Play, Microsoft Store,[21] and Samsung Galaxy Store support PWAs, but Apple App Store does not. Microsoft Store publishes some qualifying PWAs automatically (even without app authors' request) after discovering them via Bing indexing.[22]

Progressive web apps are all designed to work on any browser that is compliant with the appropriate web standards. As with other cross-platform solutions, the goal is to help developers build cross-platform apps more easily than they would with native apps.[16] Progressive web apps employ the progressive enhancement web development strategy.

Some progressive web apps use an architectural approach called the App Shell Model.[23] In this model, service workers store the Basic User Interface or "shell" of the responsive web design web application in the browser's offline cache. This model allows for PWAs to maintain native-like use with or without web connectivity. This can improve loading time, by providing an initial static frame, a layout or architecture into which content can be loaded progressively as well as dynamically.[24]

The technical baseline criteria for a site to be considered a progressive web app and therefore being capable of being installed by browsers were described by Russell in a follow-up post[25] and updated since:[26][27]

There are many technologies commonly used to create progressive web apps. A web application is considered a PWA if it satisfies the installation criteria and thus can work offline and can be added to device home screen. To meet this definition, all PWAs require at minimum a service worker and a manifest.[34][35][36]

Progressive Web App execution contexts get unloaded whenever possible, so progressive web apps need to store majority of long-term internal state (user data, dynamically loaded application resources) in one of the following manners

Here some more (developer) information about how they work:

 MDN Web Docs Progressive web appsProgressive web apps use modern web APIs along with traditional progressive enhancement strategy to create cross-platform web applications. These apps work everywhere and provide several features that give them the same user experience advantages as...

Google calls PWA's "a new way to deliver amazing user experiences on the web", which obviously explains absolutely nothing about them. The A List Apart article mentioned above is a great resource, in my opinion, so definitely check that one out. Ionic also has a pretty good introductory article: -is-a-progressive-web-app/.

I know gonative.io can turn your rails app directly into a native mobile app on android and ios. I don't know if it works for APIs. Also, I haven't yet done it myself, but there's a cool feature on the homepage. Just type in your rails app url and it automatically shows you what it would look like as a mobile app. Costs about $600 I think to do the conversion.

These apps aren't packaged and deployed through stores, they're just websites that took all the right vitamins. They keep the web's ask-when-you-need-it permission model and add in new capabilities like being top-level in your task switcher, on your home screen, and in your notification tray. Users don't have to make a heavyweight choice up-front and don't implicitly sign up for something dangerous just by clicking on a link. Sites that want to send you notifications or be on your home screen have to earn that right over time as you use them more and more. They progressively become "apps".

Critically, these apps can deliver an even better user experience than traditional web apps. Because it's also possible to build this performance in as progressive enhancement, the tangible improvements make it worth building this way regardless of "appy" intent.

The Clear Storage pane is a very useful feature when developing progressive web apps. This panelets you unregister service workers and clear all caches and storage with a single button click.Check out the section below to learn more.

The need for businesses to target customers on mobile devices is well-established at this point. The question is no longer if they should do it but how. A business that wants to appeal to mobile-based customers has three choices: build a responsive website, develop a native app or create a progressive web app (PWA).

In its simplest sense, a progressive web app is a mobile app delivered through the web. It functions like a native app, due to the use of an app shell that allows for app-style gestures and navigations. The main difference is that there is no need to download it from an app store. It runs, self-contained, right in a web browser. With the help of service workers, a progressive web app is able to load instantly, even in areas of low connectivity. With the help of pre-caching, the app stays up to date at all times, displaying the most recent version upon launching.

From a developer perspective, progressive web apps are also more economical. They are faster to build and update. You can also create one version of the app, and it displays seamlessly and identically on all devices. Rather than the segmented market of native mobile apps -- where businesses need a separate app structure for Apple and Android devices -- PWAs are unified to work on browsers that are common to all devices. Better yet, they cost less to develop than a native mobile app.

Progressive web apps are the result of advancements in browser technologies. Modern browsers let you give your users a native-app-like experience from the web app itself. You can achieve this by integrating a JavaScript framework around your existing web app. Your progressive web app can send notifications via the mobile browser, track user location, and so on. Like hybrid apps, progressive web apps also lie between native and web apps. However, there are some key differences.

You can deliver both progressive web apps and hybrid apps from app stores. However, progressive apps rank higher in search engine results with no additional effort. In addition, you get better search results than hybrid apps with the same keyword targeting.

In most cases, progressive web apps tend to be lighter in size than hybrid apps. They utilize less mobile storage and memory. However, the underlying technologies are non-native. Browser dependency could result in increased mobile battery consumption for users.

Progressive web app technology is relatively new compared to hybrid or web apps. Consequently, developer and community support for progressive apps are still evolving. Hybrid app technology is more mature, and development remains less expensive.

For some companies, their app development project is often tied closely to their marketing goals. They use a progressive web app to reach the largest possible audience and get initial sign-ups. The web app may have limited functionality or offer full-feature free trials for a limited period. The company then uses native or hybrid mobile apps to enhance the experience of paying customers. e24fc04721

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