Is it possible to determine the presence of an application on a smartphone when visiting a site?

Question

Android

Good day!
Tell me, is it possible to somehow check if the required application is installed on the site when accessing a specific site from a mobile device (android, ios) (For example, in order to show a link to the application in the market on the site if it is not available on the smartphone).
If it is possible, please tell me how? Where can you read.

Answer 1

You can, but it's more like a hack.
Register a Custom URL Scheme in the application, check on the site whether this URL can be opened, if not, the application is not installed

Answer 2

There is a standard banner from Apple - Smart App Banners
It is enough to put a meta tag on the page:
< meta name ="apple-itunes-app" content ="app-id=myAppStoreID, affiliate-data =myAffiliateData, app-argument =myURL">
app -id - 9 digits of the application ID (can be taken from the url - https://itunes.apple.com/ru/app/danceconvention.ne...
More details about affiliate-data and app-argument can be found in the documentation
https:// developer.apple.com/library/ios/documentat...

Answer 3

It is possible, but it is done on the server and uses Custom URL Scheme for this.
For example, in python it looks like this:

class ConnectHandler(webapp.RequestHandler):

    def get(self, link_id):
        try:
            link = LinkModel.gql("WHERE link=:1", link_id).get()
            if link is None:
                raise LinkNotFoundError
        except (db.BadKeyError, LinkNotFoundError):
            self.error(400)
            return
        user_agent = self.request.headers['User-Agent'].lower()
        if user_agent.find('ipad') != -1:
            self.redirect('/ipad/' + link_id)
        elif user_agent.find('iphone') == -1 and user_agent.find('ipod') == -1:
            self.redirect('/noiphone')
        else:
            self.redirect('/iphone/' + link_id)

app = webapp.WSGIApplication(service_mappings + [
    (r'/noiphone', NoIphoneHandler),
    (r'/iphone/([a-zA-Z0-9-_]{1,256})', IphoneHandler),
    (r'/iphoneno', IphoneNoAppHandler),
    ] )

Answer 4

No, only through hacks.

Answer 5

Probably not. If so, it's a security hole.

Answer 6

can try to poke into the Google market or the apple market with authorization from the client and ask the market if the “softina” is installed on such and such a device. directly into the OS you are unlikely to be allowed

Answer 7

A bunch of forums offer android software for visiting it.
Tapatalk is especially annoying.
Obviously, the software, unlike the browser, either gives a reference or a specific URL, but this is no longer important. tapatalk will surely find a way to prove itself in front of the site.
And if you have the same tapatalk on the side and enter through a normal browser, I'm sure the site will again offer installation.

Answer 8

If the hacks mentioned above can really be implemented, then your site will most likely come under the attention of antivirus companies in the near future. They put sites on their blacklist for even lesser things.