Firely Server Alternative: bonfireDB vs Vonk

TL;DR

Firely Server is a genuine, certified, native FHIR server (STU3/R4/R5) built by the people who helped initiate FHIR, with best-in-class conformance, validation, version history, terminology operations, and a documented .NET plugin/Facade architecture — if you must prove regulatory interoperability, it is a top-tier choice. It is, however, a server and not an app platform: it is an OAuth2 resource server (bring your own IdP), authorization is SMART-scope/compartment-based rather than per-row ABAC, it is closed-source with contact-sales pricing, self-hosted only with no production managed SaaS, and it has zero semantic/vector/agent tooling. bonfire is much earlier — largely vision and design rather than shipped scale — so the honest comparison is Firely's proven breadth versus bonfire's positioning: typed clinical primitives, fresh-on-commit operational reads, a reactive cache, write-enforced ABAC with automatic audit on by default, and built-in pgvector semantic search you can hand to an agent via your own MCP. Choose Firely to be a compliant FHIR endpoint at enterprise scale; choose bonfire to ship an outpatient or AI-native app fast without bolting a second database and an entire auth/AI layer onto a FHIR store.

At a glance

Firely Server (Vonk) is the certified, conformance-first FHIR data layer you buy to prove interoperability; bonfire is the OSS clinical app backend you build on when one team needs fresh reads, ABAC, and AI over their own data.

	Firely Server (Vonk)	bonfireDB
Type	Commercial, certified turn-key native FHIR server (formerly Vonk)	Agent-native clinical backend; FHIR generated underneath
Language / stack	.NET / C# on Firely .NET SDK; community edition is SQLite-only, SQL Server / MongoDB on paid tiers	TypeScript + Postgres + pgvector (Postgres-first, no Redis)
License / cost	Closed-source; flat-fee annual license, contact-sales (no public pricing)	Apache-2.0 core (free) + managed tier
Hosting	Self-hosted only (anywhere); no production managed SaaS	Your AWS (OSS) or managed
App-native typed API	No — FHIR server, not an app platform; BYO app/business logic	Yes — typed clinical primitives
Fresh-on-commit app reads	FHIR-search-backed; no guaranteed read-your-write app contract	Yes — committed operational read models
Reactive realtime cache	Dated: STU3/R4 rest-hook subscriptions only; no WebSocket push	Yes — useClinicalQuery
Built-in semantic search	None — no vector/embeddings/RAG (verified)	Built in — pgvector, ABAC-enforced
Agent / MCP layer	None built in; raw-FHIR agents cap ~50% (FHIR-AgentBench)	Build-your-own-MCP over clean projections
Clinical authorization (write-enforced)	OAuth2 resource server; SMART scopes + compartments, BYO IdP	Read + write enforced ABAC, auto-audit
Automatic audit / provenance	Tamper-resistant BALP AuditEvents, but plugin-enabled + paid Scale tier	Automatic
FHIR conformance / validation / terminology	Best-in-class: native STU3/R4/R5, ONC g(10), US Core, SMART certified; full validation + terminology ops ($validate-code/$expand/$lookup/$translate)	FHIR R4 / core profiles generated underneath; scoped conformance (honest: not a full enterprise FHIR server)
Best for	Enterprises/regulated orgs needing certified, validation-grade FHIR	Builders of AI-native health apps (scribes, copilots, agents)

Where Firely Server (Vonk) genuinely wins

Best-in-class FHIR conformance and validation, built by FHIR's co-creators, with real ONC §170.315(g)(10) certification (2025, Cert #15.04.04.3143.Fire.06.01.0.250502), US Core 7.0.0 / USCDI v4, and SMART App Launch 2.2.0 — if you must prove interoperability, this is top-tier.
A true native FHIR store across STU3/R4/R5 with full per-resource version history, batch/transactions, chaining and reverse-chaining (_has), _include/_revinclude, custom SearchParameters, and a managed conformance/Administration API.
First-class validation and terminology: profile/StructureDefinition validation plus full terminology operations ($validate-code/$expand/$lookup/$translate/$subsumes) with local and remote terminology routing — the depth you want when correctness against US Core and code systems is the bar. (SNOMED CT is free for US use via the NLM UMLS license.)
A genuinely free on-ramp: the community edition runs on SQLite at no cost for evaluation and low-volume use, before stepping up to the licensed production tiers (SQL Server / MongoDB).
Predictable flat-fee annual licensing not metered on data volume, API calls, users, or patients — financially sane as you scale, the opposite of usage-priced cloud FHIR services.
Deploy-anywhere control: .NET Core on Windows/Linux/macOS, Docker, Kubernetes (Helm), any cloud or on-prem — strong for data-residency, BAA, and air-gapped requirements.
Tamper-resistant, BALP-conformant AuditEvent generation — AuditEvents can't be updated or deleted via the REST API — for regulated, audit-grade deployments.
Backed by a real company (consulting, training, Simplifier.net profiling, enterprise support) with 6+ major versions, a regular release cadence, and named users like UCSF, Humana, Roche, and the WHO — low abandonment risk.

Where bonfireDB is built different

Fresh-on-commit operational reads: bonfire's design serves app reads from committed read models instead of routing UI through FHIR search indexes — Firely is a FHIR server first, so app-facing query freshness is whatever your search backend gives you, not a guaranteed read-your-write contract.
Reactive realtime cache for app clients: bonfire ships useClinicalQuery; Firely's realtime is dated for app push — subscriptions are STU3/R4-style, rest-hook channel only, with no R5 topic-based framework and no native WebSocket push to clients (verified), and full event streaming (PubSub via Kafka/RabbitMQ) is a paid Scale add-on needing DB change-data-capture.
Write-enforced clinical ABAC: bonfire enforces per-row read AND write authorization. Firely does not authenticate or authorize beyond being an OAuth2 resource server — auth is SMART scopes + compartments only (BYO IdP / separate Firely Auth product), with the sharp edge that resources outside a configured compartment are not access-controlled and per-row ABAC isn't first-class (verified).
Built-in, ABAC-enforced semantic search: bonfire embeds pgvector search with authz applied per hit. Firely Server has zero vector/semantic search, embeddings, or RAG (verified) — you'd build that entire layer yourself alongside the FHIR store.
Agent-native via build-your-own-MCP over clean typed projections: Firely has no built-in agent/MCP/LLM tooling (verified), and raw-FHIR agents cap around ~50% on task benchmarks (FHIR-AgentBench), so an AI app on Firely starts from scratch on the agent layer.
App-state and audit posture for a single team: app/draft/workflow state is a first-class home in bonfire (no second database), and automatic audit + provenance is on by default — whereas Firely's tamper-resistant AuditEvent generation, while real and BALP-conformant, requires explicitly enabling Vonk.Plugin.Audit and is gated to the paid Scale / Prior-Auth tiers (verified).

Which should you choose?

Choose Firely Server (Vonk) if…

Choose Firely Server if you need a certified, validation-grade FHIR endpoint — ONC g(10), US Core, SMART App Launch — to prove interoperability to payers, regulators, or partners, with predictable flat-fee licensing, deploy-anywhere control, full version history, and the backing of FHIR's co-creators. It is the buy-not-build choice when conformance is the product and you're prepared to bring your own auth, AI, and app layer in .NET.

Choose bonfireDB if…

Choose bonfire if you're a founder shipping an outpatient or AI-native app and want fresh-on-commit reads, a reactive cache, write-enforced ABAC with audit on by default, and semantic search an agent can call via your own MCP — without standing up a second database and an entire auth/AI stack on top of a FHIR server. Pick it knowing it's early-stage and offers scoped (not full enterprise) FHIR conformance, generated underneath.

bonfireDB is early-stage; this compares its design and positioning against Firely Server (Vonk) as it ships today (2026). Verify current Firely Server (Vonk) capabilities before deciding.

FAQ

Frequently asked questions

Is bonfireDB a Firely Server alternative?

Only for some use cases. Firely Server (Vonk) is a certified native FHIR server built for conformance and validation. bonfireDB is an app backend that generates FHIR underneath (not a FHIR server), designed for fresh-on-commit reads, write-enforced ABAC, and AI. If you must prove ONC g(10) interoperability, Firely is the right tool; if you're shipping an outpatient or AI app fast, bonfireDB fits better. bonfireDB is early access.

What does Firely Server (Vonk) do that bonfireDB doesn't?

Firely Server is a certified, validation-grade FHIR server: ONC §170.315(g)(10), US Core, SMART App Launch, full STU3/R4/R5 history, and complete terminology operations ($validate-code, $expand, $lookup, $translate). bonfireDB offers scoped FHIR R4 generated underneath, not a full enterprise FHIR server, and is honest about that.

Does Firely Server have vector or semantic search for clinical notes?

As of 2026, no. Firely Server (Vonk) has zero built-in vector search, embeddings, or RAG, so you'd build that layer yourself. bonfireDB is designed with built-in pgvector semantic search, ABAC-enforced per hit, that an agent can call via your own MCP. Verify current Firely capabilities before deciding.

How does authorization differ between Firely Server and bonfireDB?

Firely Server is an OAuth2 resource server using SMART scopes and FHIR compartments, with a separate IdP — per-row ABAC isn't first-class, and resources outside a configured compartment aren't access-controlled. bonfireDB is designed to enforce per-row read and write ABAC with automatic audit on by default.

Is Firely Server open source, and what does it cost?

As of 2026, Firely Server (Vonk) is closed-source with flat-fee annual licensing and contact-sales pricing; a free SQLite community edition exists for evaluation. bonfireDB's core is Apache-2.0 (free) with an optional managed tier. Verify current Firely pricing before deciding.

bonfireDB vs Firely Server (Vonk)