Clearly great concept but now broken with no support available

Link to support no longer works and I can find no other support contact information. Conceptually, Clear immediately spoke to me and I was a long-time user on both iOS and macOS. I have bought over $150 in scheduling/GTD/To-Do apps and Clear had the best concept — and execution for a while. But sync for Clear has broken for months now. I have tried all possible remedies including complete uninstall/install, connect/disconnect from iCloud, etc. No success. Absolutely no way to contact developer for support now. This is very sad because this was the app that worked for me. If only they had not abandoned it….

nate2late8 about Clear – Tasks, Reminders & To-Do Lists, v1.1.7