This might be relevant to you: I am building a free, open source self-help app. It has a quick daily check-in, a journal, and habit tracking, so some parts could work for keeping a simple record. I originally made it for myself because all the apps in this space were so expensive, and then decided to keep it free so people who can't afford those can use it too.

It is in very early development, but I am very invested in it, so you can expect frequent updates. If you are willing to try it, I would be really grateful for feedback.

Since you are building something yourself: my project is open source (https://github.com/Selftend/selftend), so feel free to take anything useful from it. Honestly, input from someone who has lived through quitting six systems would make it better.

And I would gladly have a conversation about this - no need to pay anyone, I would just enjoy being able to help. Contact is in my profile.