London-based healthtech startup Calibre has emerged from stealth with $3.3 million in pre-seed funding as it launches early access to its proactive health service.

The round was led by Berlin-based Amino Collective, with participation from Daybreak Ventures, Cocoa Ventures, and angel investors including Gousto founder Timo Boldt and N26 co-founder Maximilian Tayenthal.

Calibre says it is building a personalised health navigation platform that combines clinicians, diagnostics, and causal AI to help users understand the factors affecting their health and create tailored plans. The company is launching with early customer access live and a waitlist ahead of a broader nationwide rollout in the UK.

The funding comes as startups continue to test new consumer health models that go beyond tracking and symptom checking, with Calibre positioning itself around more continuous and proactive care.