I'm working on a focus / pomodoro timer again that I started a few years ago.
The redeeming qualities, are that it doesn't require login, and you can just use it as a simple pomodoro timer that syncs to youtube / spotify music.
The additional features are all optional. Configuration, timeblocking, task management, etc... The features that are paid are just 1 (relatively low) price (with PPP per country). No subscriptions.
I started this project after pomofocus added giant ad banners, and had been missing some quirky things I had always wanted in a timer.