Heap auto-captures every user interaction and lets you retroactively define events and funnels. StoreVitals monitors the technical health that determines whether those interactions convert. Different tools for different questions.
Heap is a product analytics platform built to answer 'Which users do X, and do they convert?' StoreVitals is a site health platform built to answer 'Are there technical issues preventing conversions?' They're complementary: Heap's funnel data tells you where customers drop off; StoreVitals tells you if the drop-off page has a slow LCP or broken checkout schema causing the exit.