Excellent and tried/tested tool I strongly recommend. Really interesting to hear why you started it, I too have encountered devs saying things like "well on my machine it gets 100" (PAIN). I have used Lighthouse Metrics screenshots multiple times to illustrate when a site I have produced or am working on has good GLOBAL lighthouse scores. 10/10 tool. If I had a suitable project and the budget I would absolutely use it for monitoring.
Have been using Lighthouse Metrics for the last couple of years now – it's an incredible tool for making sure my sites perform well so I, in turn, can sleep well at night 😌
Very excited to see it launch on Product Hunt – congrats Chris!!