I would stay far, far away from any of these apps that bombard marketing constantly. Their marketing is so predatory and they don't tell you anything you can't get from a book or podcast or good Youtube channel like How To ADHD.
Anything making extremely vague claims (e.g. "be a better parent" "improve self-regulation" "be more productive" "achieve goals") is worth swerving. Try the free versions of tools if you want to try them out. Don't pay for something without knowing exactly what you're paying for. The apps like Liven/Fabulous all talk in extremely vague terms and don't explain what you actually get from the app, how they do what they claim to do or why it is better than free or cheaper versions.
Dubbii is a tool for a specific purpose which is body doubling and a virtual support group which is probably a bit more UK-focused than other online ADHD support groups (although they have international participants). That is specific, so you probably have an idea of whether it will be helpful for you or not. IIRC it's also pay as you go type thing? So not a subscription designed to trap you into complicated cancellation policies.
Agree YNAB is good if you get into the theory and understand how to use it, so again this is a specific tool because YNAB is a method first and the app is a tool which makes it easier to follow the method.
I did use Fabulous years ago when it was much less pushed on social media and it did help me set up a morning routine, but it didn't stick. They also seem to promise much more now which makes me suspicious of it. Ultimately years later, I've realised that ADHD means I don't form habits in the same way as NT people anyway, and I don't find habits and routines as helpful as NT people seem to find them. For me a tool to help set a habit or routine will only work for so long and then I fall off the wagon and if it had taken me too long to build up then I don't have the motivation to build it all up again from scratch because the novelty is gone. I don't actually need scaffolding to make NT tips work for me, I need to find my own tips and supports which work for me without scaffolding. That's why I tend to prefer tools or resources which are made by people with ADHD themselves OR by people who are experienced in helping people with a particular difficulty. If you look up who owns these apps, a lot of the ones with the most prolific marketing are tech companies primarily and they are scraping very generic wellness or productivity type advice. There is probably nothing wrong with this advice, which is why it will help some people, but it's very similar to the same things which are in all the self-help books, articles, blogs, podcasts etc etc. Many adults with ADHD already have a stack of self-help books they have tried and not been helped by. If you're hoping for something new then I don't think these platforms will deliver it.
The post by the user gushing about Liven and Fabulous sounds like an ad, sorry if I've got that wrong, but something about the wording of the post.