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Heap is a product analytics platform famous for auto-capturing every user interaction — no event tracking code required. UK product teams retroactively analyse clicks, taps, and pageviews without planning the tracking taxonomy upfront. The free tier includes 10,000 sessions/month; paid plans start around $120/month. It integrates with Segment, Slack, and data warehouses. Heap is GDPR compliant with EU data residency options. It's ideal for fast-moving UK startups that don't want to instrument everything in advance; data volume can become a cost consideration as you scale.