FHIR vendor consolidation in 2026 identified seven vendors that ship real product across the FHIR ecosystem. Understanding their specific strengths helps buying.

**1. HAPI FHIR (open source Java).** Mature, widely deployed, requires operational skill. Best for Java-heavy teams and budget-conscious deployments.

**2. Aidbox (commercial Clojure).** Full-stack platform (server + terminology + auth + forms). Best for teams wanting bundled operations.

**3. Medplum (commercial TypeScript).** Modern stack, event-driven, growing. Best for TypeScript teams and modern app development.

**4. Firely Server (commercial .NET).** Full .NET ecosystem. Best for Microsoft-stack organizations.

**5. Microsoft FHIR Server (Azure).** Cloud-managed option. Best for Azure-first organizations.

**6. Ontoserver (terminology).** Reference terminology server. Best for enterprise terminology infrastructure.

**7. Smile CDR (commercial HAPI).** Commercial support for HAPI. Best for teams that need enterprise support.

Vendor category comparison

Total 3-year cost estimate (moderate ambulatory)

Selection criteria

1. Team language expertise. 2. Bundled vs. best-of-breed preference. 3. Cloud strategy alignment. 4. Support quality expectations. 5. Regulatory environment.

FHIR vendor selection is a five-year commitment. The seven vendors above cover essentially all production deployment paths in 2026.