I’ve tried to write simple PWA with re-frame which serves as life counter in 2 player games like Star Realms (Star Realms | Board Game | BoardGameGeek) or Magic the Gathering (Magic: The Gathering | Board Game | BoardGameGeek).
For now it just supports counting life without any additional effects. There is also history of recent life changes.
Github repo: GitHub - nenadalm/life-counter
The app: Life counter