In Tridion Sites 9.1, is it possible to have a mix of extensions that do and do not use the Add-on Service?

For example, could I have a GUI Extension that I've downloaded from the SDL App Store that needs deploying using the Add-on Service alongside some other legacy GUI extension that I've deployed 'manually'? (As long as these don't impact one-another, obviously).

I would assume that I can and that the manually deployed extensions just don't appear in the Add-ons section of the GUI, but was hoping someone could confirm before I start my upgrade.

1 Answer 1


Yes, it is possible, but only for CM side extensions. For CD, it's either the old way OR the add-on mechanism.

  • Hi Atila. Thanks for the answer. Is this documented anywhere, do you know, or just something you found by using it? Commented Feb 4, 2020 at 14:53
  • I know this because I've had the same question :) and was discussing it with the relevant product owners. I don't think it's documented anywhere, or at least I cannot find it.
    – Atila Sos
    Commented Feb 11, 2020 at 12:15
  • 1
    Great. Thanks for clarifying. It would be nice if SDL could update this in the docs please 🙂👍 Commented Feb 11, 2020 at 13:59

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