Addiction is a symptom of something else, usually trauma (which I include forgetting fundamental ways to use the mind as an item, eg. how to be still and not suffer from boredom).
For me, there were several issues. Anxiety was my normal state, though I didn't know it because I'd been cultivating my addiction since around age 8 & was largely disconnected from my emotions. They were also seemingly locked up from denial of the trauma stemming from being molested (saying "That traumatized me" aloud to myself led to a flood of emotions all at once). I grew up in a codependent family and culture. I was born into the psychosocial slavery of capitalism and taught I had to have a job and money to survive. This disconnected me from my need for community support, which I was also shamed from seeking. I was bullied by my best friend growing up, as well as most of the adults in my life. All of these things had a lasting impact on my relationships.
What worked for me was healing from all of that. I use RescueTime to keep an eye on my usage, but have no other controls anymore. Early in recovery, someone else monitored my screen time, I used MManager (I think) for locking down my phone and a boot password for the laptop, with my roommates & therapist knowing the passwords. Basically, setting up accountability systems for myself. But that's just what kept me from lapsing, which isn't as big of a deal as addiction specialists told me, because I started using them as learning opportunities to observe how my mind worked in those situations.
Basically, any app that isn't helping build mindfulness, learn about what life needs to thrive, build a supportive community, and identify/heal from trauma is operating from the current mainstream approach to addiction and is only going to have marginal effects. Don't look to current addiction science...I turned my info addiction inward and healed that way.
If you'd like to talk more about what you're going through and would like to add someone to your support network, I'm available for it.