Siilo

Siilo is a European digital health company that built a secure, compliant messaging and collaboration platform for healthcare professionals. Its products have been used by clinicians and care teams to communicate about patient cases, share medical knowledge, and coordinate care through encrypted mobile and web-based workflows. The company expanded from a standalone medical messenger into organizational collaboration tools for hospitals and care networks. In March 2023, Siilo was acquired by Doctolib, and the product later evolved under the Doctolib Siilo brand before being renamed Doctolib Connect in November 2025. Siilo is therefore best understood as an acquired healthtech collaboration platform rather than a therapeutics developer.