Installability is a core requirement of Progressive Web Apps (PWAs). By prompting users to install your PWA, you allow them to add it to their home screens. Users who add apps to home screens engage with those apps more frequently.
A web app manifest includes key pieces of information required to make your app installable.
How the Lighthouse web app manifest audit fails
If a page's manifest doesn't include the following properties, it will fail the audit:
iconsproperty that includes a 192x192 px and a 512x512 px icon
displayproperty set to
prefer_related_applicationsproperty set to a value other than
How to make your PWA installable
Make sure your app has a manifest that meets the criteria above. See Make it installable for more information about creating a PWA.
How to check that your PWA is installable
When your app meets the minimum requirements for installability,
Chrome fires a
that you can use to prompt the user to install your PWA.
In other browsers
Other browsers have different criteria for installation
and for triggering the
Check their respective sites for full details: