Founded by digital health clinician and behavioural AI scientist Dr Paul Sacher, Sacher AI is a behavioural science and AI consultancy specialising in the design, development, and evaluation of patient-facing AI systems for health-related behaviour change, with a focus on obesity, metabolic health, and mental health.

Our founding team has built AI safety infrastructure, evaluation frameworks, and patient-facing systems for large-scale digital health and MedTech providers. We are grounded in real-world deployment challenges.

What we do
AI strategy and governance
We help digital health teams define where AI can add real value, from stakeholder alignment and use case identification through to AI roadmaps, safety frameworks, and governance design, including ISO 42001.

Consultancy and delivery
Hands-on consultancy and end-to-end delivery across the full patient journey. From behavioural diagnosis and product development through to data analysis, research, and peer-reviewed publication. We advise, and we build alongside you.

PromptSafe
Our structured evaluation platform for testing AI systems against behavioural, clinical, and safety criteria before they reach real users. Simulation, persona-based modelling, and safeguarding built in.

OVRSI
An independent oversight layer for patient-facing AI in digital health, currently in development. Continuously monitors conversations between patients and AI systems, surfacing safety signals, behavioural patterns, and model drift.

Current and previous clients include Numan, MedExpress, Holly Health, WW International, Allurion, Slimming World, and MEND, among others.

Sacher AI

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Sacher AI

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Teams

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