# Sacher AI

> Sacher AI is a specialist consultancy bringing behavioural science to AI in health. We help GLP-1 and digital health teams improve adherence, retention, and outcomes by designing, evaluating, and safely deploying the behavioural layer that makes patient-facing AI work. Founded by Dr Paul Sacher, PhD (26 years across healthcare, academia, and health innovation; 27 peer-reviewed publications; Honorary Senior Lecturer, Imperial College London).

Key facts:
- Behavioural AI is our signature concept: the layer that helps AI systems influence behaviour safely and effectively in real-world health settings (tone, timing, framing, intensity).
- Focus areas: GLP-1 and obesity care, patient-facing AI agents, AI safety and evaluation, clinical and behavioural research.
- Our product PromptSafe (prompt-safe.com) tests conversational AI agents across hundreds of realistic and adversarial simulated conversations before deployment.
- Published the FAST evaluation framework (fidelity, accuracy, safety, tone) in Frontiers in Digital Health, 2025.
- Patient-facing AI work deployed across 80 obesity clinics in 22 countries and a UK programme serving over 500,000 GLP-1 patients.
- Clients include Allurion, Numan, Holly Health, Slimming World, HeliosX, MedExpress, Liva Healthcare, Reset Health, Stride, WW, Lumen, and MEND.

## Key pages

- [What we do](https://www.sacher.ai/consultancy-services): services across GLP-1 behaviour change, AI agent design and delivery, AI safety and evaluation, and research
- [Case studies](https://www.sacher.ai/case-studies): named and anonymised examples with problems, approaches, and outcomes
- [Research and publications](https://www.sacher.ai/research-publications): peer-reviewed publications with DOIs
- [About](https://www.sacher.ai/about-us): team and track record
- [Blog](https://www.sacher.ai/blog): writing on behavioural AI, GLP-1, and AI safety
- [Contact](https://www.sacher.ai/contact): book a discovery call

## Company

- Trading name: Sacher AI. Legal entity: Capital Consult Ltd (T/A Sacher AI). Company number 06800173. ICO registration ZC144061. United Kingdom.