Support
I build and support these apps myself, so email reaches me directly.
Email tustison@protonmail.com.
Tell me which app or website it's about, your iPhone model and iOS version, and what happened. A screenshot helps.
Help for each app
Each app page answers the common questions, like restoring a purchase or moving to a new phone.
Purchases and refunds
Apple handles every purchase and subscription in these apps. To cancel a subscription, open the Settings app on your iPhone, tap your name, then Subscriptions. Refunds are decided by Apple. You can ask for one at reportaproblem.apple.com.
Corrections to the websites
If something on tenminutemath.com, dailychengyu.com, noisyneighborhelp.com or psmfdietplan.com is wrong or out of date, email me the page address and what needs fixing.