The OBDEleven app only works with the said OBDEleven dongle
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OBDeleven products
obdeleven.com
The bottom white two on the page above plus the pro license which allows you to "program" without that you use the apps which are micro payment things, don't always work and you don't give the VCDS programming which is covered in the pages. The white ones are the original Android based one. You don't need the ring key one - got that, don't use the ring. I have no experience with the black ones which are Android and iOS. But the methods will be the same.
Proper VCDS is more expensive, uses a laptop and not so portable. You need wifi out to the car or 4G with OBDEleven.
The cheapskate bit comes in when people think they can use other dongles with the OBDEleven app. Can't. Basically the OBDEleven app is connected by bluetooth to the dongle. The commands get related back to the OBDEleven central system and the stuff comes back to program the car. Without the wifi / 4G link the system doesn't work. You can read stuff off line in the house since that's either pulled back off their servers or stored locally... reckon it's pulled back.
You can have more than one VAG car in the database so use across vehicles. The micro payment app I don't bother with and in no way do they give you a flavour of what you can do with it.
So basically if you have a modern Android device you can get going with the original dongle for 39-99 + 24-99 Euros (Total 64-98) or the Black Pro Pack (99-99 Euros) second one along which is suppose to be iOS as well as Android and includes the Pro license. That's a second option in the original white ones - have no experience of that. The other way is to use a subsidised Prime Amazon Fire reader tablet, you put that on the Playstore - instructions can be found on the web and that's then turned into a low cost Android tablet.... talked about that before, people do that with OBDEleven as well. Big screen rather than a small smart phone if that's an issue and you got an Android tablet as well. That's for the technically minded. Probably use big iOS tablets or phablets if you have one of them. Most people are happy to read small screens....
German thread of the differences of iOS version takes it uptodate:
Hallo an alle Iphone Besitzer Nachdem OBDeleven bisher nur mit Android ging. Ist es bald soweit. Ab dem 03.Mai2019 gibt es OBDeleven auch für IOS. OBDeleven für IOS [URL:https://obdeleven.com/nextgen/]
www.
ateca-forum.de
It appears in April 2020 is was fully rolled out to iOS prior to that not fully implemented to the same level as the Android side.