as someone who worked at Clinkle (on backend) we did indeed have this early on. it was one of the demos used during my interviews to show me the app. The featur

as someone who worked at Clinkle (on backend) we did indeed have this early on. it was one of the demos used during my interviews to show me the app. The feature used infrasound instead of ultrasound like this article. unfortunately coffee grinders and such would mess with transmission. the sound engineer working on it also left shortly before I started so the feature never got fixed and eventually killed.