Demystifying progressive web apps

D E M Y S T I F Y I N G P R O G R E S S I V E W E B A P P S

! @ M A R C U S H E L L B E R G

S T O R Y A N D P H I L O S O P H Y

Software is eating the world and what most of us see of it is the user interface. The user

interface has become the key component of how the users experience the business

behind it. Competition is lost or won due to user experience. Simplicity is king and the

users get frustrated by anything ugly, slow or not working on the device they happen to

use at the time. We at Vaadin fight for simplicity and invite everyone to join this fight.

Together we want to build a user interface that puts a smile on the user’s face.

Vaadin is the technology that empowers developers to build the best web-apps for

business purposes. Our priority over everything else is developer productivity because

we believe that by simplifying the developer experience and saving the developer’s

time, they are best able to focus on building great user interfaces.

Our brand is what we want everyone to think about us. When everyone - both us and

the people around us - have a consistent understanding of what Vaadin is and what we

stand for, it enables that image to spread and amplify. This book defines what we want

that image to be. It defines what the Vaadin brand is.

I hope that You are as excited and proud of living and breathing the Vaadin brand as

I am. You are the one who is shaping what everyone thinks about Vaadin - using this

brand as a tool and a guideline every day.

Let’s fight for simplicity for both the users and the developers!

Joonas Lehtinen

Founder & CEO

Vaadin

I N T R O D U C T I O N

A P P I N S TA L L S / M O N T H :

While we haven’t yet reached ‘Peak App’ the market

is definitely tightening, and app publishers need to rethink how to break through to the consumer’s screen.

comScore 2016 US Mobile App report

comscore.com/Insights/Presentations-and-Whitepapers/2016/The-2016-US-Mobile-App-Report

Despite significant investment and hopes for positive ROI, mobile applications are not paying off for many brands.

Compelling alternatives such as progressive web apps mean the branded app economy is poised for change.

gartner.com/smarterwithgartner/gartner-predicts-2017-marketers-expect-the-unexpected

GARTNER: 20% WILL ABANDON THEIR MOBILE APPS BY 2019

T H E P R O B L E M I S F R I C T I O N

open the app store80find your app in the store64tap install51accept permission requests41find the app on their home screen33

26 will open the app

O U T O F 1 0 0 I N T E R E S T E D P E O P L E

tap install80accept permission requests64find the app on their home screen51

41will open the app

S T I L L , O N L Y . . .

C O S T P E R I N S T A L L

$ 1 . 5 0 +

fiksu.com/resources/fiksu-indexes

Users spend almost 90% of time in their top 5 apps.

Source: comScore 2016 report

W H A T A B O U T M O B I L E W E B ?

80 will open the app

O U T O F 1 0 0 I N T E R E S T E D P E O P L E

Source: comScore 2016 report

# Visitors (MM)0

Minutes

3x 20x

Native apps Mobile web

Top 1000 Mobile Apps vs. Top 1000 Mobile Web Properties

H O W A B O U T H Y B R I D , T H E N ?

WHAT'S HOLDING BACK THE MOBILE WEB?

1 . B A D U S E R E X P E R I E N C E

2 . P O O R R E - E N G A G E M E N T

3 . P E R F O R M A N C E

P R O G R E S S I V E W E B A P P S

1. Reliable

2. Fast

3. Engaging

T R Y B E F O R E Y O U B U Y

H O W D O Y O U B U I L D A P W A ?

P W A C H E C K L I S T :

" Site is served over HTTPS

" Responsive layouts, works on mobile

" First load is fast even on 3G

" Site works cross-browser

" Page transitions don't feel like they block on network

" Each page has a URL

" Metadata is provided for Add to Home screen

developers.google.com/web/progressive-web-apps/checklist

D O Y O U N E E D T O S T A R T F R O M S C R A T C H ?

1 . A D D A N A P P M A N I F E S T

{ "name": "Todo App", "icons": [{ "src": "todo.png", "sizes": "192x192", "type": "image/png" }], "start_url": "/index.html", "display": "standalone", "orientation": "portrait" }

https://developer.mozilla.org/en-US/docs/Web/Manifest

W E B A P P M A N I F E S T

2 . D E F I N E A S E R V I C E W O R K E R

Service worker

S E R V I C E W O R K E R

if ('serviceWorker' in navigator) { }

if ('serviceWorker' in navigator) { window.addEventListener('load', () => { navigator.serviceWorker.register('/sw.js'); }); }

let CACHE_NAME = 'cache-v1'; let urlsToCache = ['/', '/styles/main.css', '/script/main.js'];

/sw.js

self.addEventListener('install', event => {

self.addEventListener('install', event => { event.waitUntil( caches.open(CACHE_NAME)); });

self.addEventListener('install', event => { event.waitUntil( caches.open(CACHE_NAME) .then(cache => cache.addAll(urlsToCache)); ); });

self.addEventListener('fetch', event => {

self.addEventListener('fetch', event => { event.respondWith( ); });

self.addEventListener('fetch', event => { event.respondWith( caches.match(event.request) ); });

self.addEventListener('fetch', event => { event.respondWith( caches.match(event.request) .then(response => {

if (response) { return response; } return fetch(event.request); } ) ); });

github.com/GoogleChrome/sw-precache

github.com/GoogleChrome/sw-toolbox

toolbox.router.get('*.json', toolbox.cacheFirst);->

T O O L S

3 . A D D P U S H , B A C K G R O U N D S Y N C

( I F Y O U W A N T T O )

developers.google.com

/fundamentals

/getting-started

/codelabs

/push-notifications

Lighthouse

T H E B A D N E W S

N O I O S S U P P O R T

T H E G O O D N E W S

G R E A T A N D R O I D S U P P O R T

(88% MARKET SHARE)

A N D D E S K T O P O F C O U R S E

T H E Y A R E A P R O G R E S S I V E

E N H A N C E M E N T

C A N B E U S E D W I T H A N Y F R A M E W O R K

P A R T O F T H E W E B P L A T F O R M

Help developers build web apps that users ♡

T H A N K Y O U !