Spark FHIR R4 Conformance

Spark version 2.4.1-r4 · Overall: 70% (16/23 tests passed) on round 2026-q2-r000. Source: https://github.com/FirelyTeam/spark.

About Spark

Spark is Firely's original open-source FHIR server, now in long-term maintenance. Historically one of the earliest .NET FHIR implementations; still deployed in legacy projects but no longer the active Firely product.

Scores by profile

• Bulk Data kickoff surface: N/A — Patient/$export operation not implemented (probe GET /Patient/$export → 400)
• FHIR R4 base spec: 70% (16/23) — MUST 5/7 · SHOULD 6/9 · MAY 5/7

Each cell links to the profile-level scoreboard comparing Spark against every other tested server.

Methodology

Tests are authored as FHIR R4 TestScript Resources and run by an open-source executor against a fresh Docker deployment of each server. We deliberately don't compute a composite number — read the methodology for the reasoning.

Compare to other FHIR servers

HAPI · MS FHIR · Medplum · Aidbox · Blaze

← Back to the conformance matrix · FHIR engineering blog · Book a demo