QuickFIX and Quazar are not rivals at the engine level, and the comparison is more useful once that is said plainly. QuickFIX is a free, open-source implementation of the FIX protocol, available as separate engines for C++, Java (QuickFIX/J), .NET (QuickFIX/n) and Go (QuickFIX/Go), that developers compile into their own applications.1,2 Quazar, built by Quod Financial, is an AI-native FIX fabric whose session pool runs on a hardened QuickFIX engine, with routing, dialect translation, session management, monitoring and AI-driven onboarding built on top. The question is whether your firm wants to build that layer itself or run one that already exists.
QuickFIX is licensed under the permissive QuickFIX Software License, with optional paid support from Connamara Systems, which describes itself as co-author and official maintainer of the project.3,4 Quazar is proprietary, free for buy-side firms for up to 10 inbound connections and priced at a fixed rate for the sell side.
Quazar vs QuickFIX at a glance
| Criteria | QuickFIX (C++, /J, /n, /Go) | Quazar |
|---|---|---|
| Category | Open-source FIX protocol engine and library family1,2 | AI-native FIX fabric: routing, transformation, session management and monitoring in one platform |
| What you get | Source code and packages you compile or import into your own application; session management, message parsing and validation, typed message generation1,5 | A runnable platform your OMS or any FIX-capable application connects to, with no front-end changes |
| Licence and pricing model | Free and open source, QuickFIX Software License v1.0; paid commercial support tiers sold by Connamara, figures not published3,4,6 | Proprietary; free for the buy side up to 10 inbound connections; fixed price for the sell side, no per-connection, plug-in or network fees |
| Deployment | Self-hosted, embedded in customer applications; no hosted or managed offering from the projects2 | On-premise, cloud-hosted, or fully managed by Quod Financial |
| FIX versions | FIX 4.0 to 5.0 SP2 and FIXT 1.1 (C++); QuickFIX/J adds FIXLatest; QuickFIX/Go 4.0 to 5.0 SP21,7,5 | FIX 4.x and 5.0, with cross-version conversion inside a single flow |
| Languages | C++ with Python and Ruby bindings; Java; C# and .NET; Go1,7,5 | Written in C++; configured through a visual rule builder, plain-language AI or a REST API, no coding required |
| Dialect translation and transformation | Not advertised on the project sites; custom fields are handled through the data dictionary, and mapping between counterparties is typically application code2,5 | Core function: version conversion, tag remapping, defaulting, symbol suffixing, repeating-group manipulation, regulatory enrichment for Reg NMS, MiFID II and CAT, with rules generated by AI |
| Routing | The project sites position QuickFIX as a protocol engine rather than a routing product; routing between counterparties is application logic you build2 | Pass-through, fan-out, funnel-in, many-to-many, market data fan-out and drop-copy, managed through a REST API with no restart |
| Counterparty onboarding and certification | No named service from the projects; Connamara offers implementation design and advisory services4 | AI-driven automated certification and testing, template library; onboarding available as a managed service |
| Monitoring | No separate monitoring product is described on the project sites; operations rely on session logs and the tooling a firm builds around them2 | Grafana-based dashboards, latency tracking, alerting, audit trail, message-level tracing and replay |
| Support and SLAs | Community, or Connamara commercial support with guaranteed response times, from Basic to Platinum tiers4,6 | Maintained by Quod Financial on every deployment; managed operations against defined service levels |
| AI | No AI features described on the project sites2 | AI-native: rule generation, automated triage, automated certification; bring your own LLM; MCP for your own agents |
| Origin | Project dating from around 2001, created by Oren Miller; maintained with Connamara Systems3,5 | Built and maintained by Quod Financial, a trading technology company with more than twenty years of FIX infrastructure |
What is QuickFIX, and what does it do well?
QuickFIX is a family of open-source FIX engines, and QuickFIX/J describes itself as the industry standard open source FIX engine for Java.7 The C++ engine supports FIX 4.0 through 5.0 SP2 and FIXT 1.1, compiles with GCC, Clang and MSVC, and offers Python and Ruby bindings.1 QuickFIX/J is a pure Java implementation with no native dependencies, built with Maven or Gradle, and extends coverage to FIXLatest.7 QuickFIX/n covers .NET, now including .NET 8, and QuickFIX/Go provides a full-featured engine in Go with spec-driven validation and generated type-safe messages.8,5 All four are free under a permissive licence.2,3
Its strength is that it makes a correct FIX session a solved problem: logon, heartbeats, sequence numbers, resend, persistence and message validation against a data dictionary are handled by the library. A firm with developers who know the protocol can have a working session quickly. Commercial support with guaranteed response times is available from Connamara Systems, in tiers from Basic to Platinum, and in 20-hour bundles for QuickFIX/Go.4,6 Quod Financial's own choice of a hardened QuickFIX engine for Quazar's session pool is itself a measure of how dependable the engine is.
How does Quazar differ from QuickFIX?
Quazar differs from QuickFIX in everything that sits above the session. QuickFIX gives you correct FIX sessions; as a product, it does not route between counterparties, translate one counterparty's dialect into another's, monitor a fleet of sessions, or onboard a new broker from its specification. Every one of those is application code a firm writes, tests and maintains, and it is that code, multiplied by the number of counterparties, that turns FIX connectivity into a permanent engineering cost.
Quazar is that layer, already built. It runs a session pool on a hardened QuickFIX engine with no hard session limit, SSL, sequence-number control from the GUI, data dictionary changes without a session restart, configuration rollback and message replay. Above it sit rule-based routing and transformation, generated by AI from a counterparty's specification and validated by automated certification and testing; Grafana-based monitoring with alerting and an audit trail; and a REST API for every operation, so changes apply without a restart. A buy-side firm gets all of it free for up to 10 inbound connections.
What Quazar does not give you is the source code. QuickFIX is open source and Quazar is proprietary: Quod Financial decided against open-sourcing the core to protect twenty years of know-how, and opens the edges instead. Quod Financial states it intends to publish plug-ins openly where a plug-in serves the wider market rather than the core engine, and the platform exposes a REST API, bring-your-own-LLM and MCP support. A firm whose policy requires source access for the engine will keep QuickFIX at the engine level, and may still put Quazar in front of it.
When is QuickFIX the right choice, and when is Quazar?
Choose QuickFIX when you are building an application that must own its FIX session in your own code, when you have the developers to maintain the routing, mapping and monitoring around it, and when the number of counterparties is small and stable enough that each new one is an acceptable project. Choose Quazar when the counterparties are the problem: a buy-side desk with a broker list to connect without an engineering project, or a sell-side firm normalising hundreds of inbound client dialects into one format.
They combine naturally. An application built on QuickFIX is a FIX-capable application, and it connects to Quazar as a standard session. The application keeps its engine and its code; Quazar absorbs the counterparty dialects, so the application only ever sees one normalised format.
Questions firms ask when comparing Quazar and QuickFIX
Is Quazar built on QuickFIX?
Yes. Quazar's session pool runs on a hardened QuickFIX engine. Routing, transformation, monitoring, the AI rule builder and automated certification are Quod Financial's own layers on top of it.
Is Quazar open source like QuickFIX?
No. Quazar is proprietary software from Quod Financial. It is free for buy-side firms up to 10 inbound connections, and its edges are open: plug-ins that Quod Financial intends to publish where they serve the wider market, a REST API, bring-your-own-LLM and MCP support.
Does QuickFIX translate between counterparty dialects?
Not as a described product feature. The project sites position QuickFIX as a protocol engine: session management and validation against a data dictionary. Mapping one counterparty's conventions onto another's is application code you write; in Quazar it is a rule set, generated by AI.
Can I replace a QuickFIX-based bridge with Quazar?
Yes. A bridge built in-house on QuickFIX addresses the counterparties it was written for; Quazar replaces the web of bridges with one fabric, where each new counterparty is a rule change rather than a new application.
What does commercial support look like for each?
QuickFIX support is sold by Connamara Systems in tiers with guaranteed response times. Quazar is maintained by Quod Financial on every deployment, with a fully managed operations option against defined service levels.
Can a QuickFIX application connect to Quazar?
Yes. Any FIX-capable application connects to Quazar as a standard FIX session, without changes to the application. Quazar handles routing and dialect translation to the counterparties on the other side.
Sources
- QuickFIX C++ repository, README, github.com/quickfix/quickfix, accessed 22 September 2026.
- QuickFIX project site, quickfixengine.org, accessed 22 September 2026.
- QuickFIX Software License, Version 1.0, github.com/quickfix-j/quickfixj LICENSE, accessed 22 September 2026.
- Connamara Systems, "QuickFIX", connamara.com/quickfix, accessed 22 September 2026.
- QuickFIX/Go project site, quickfixengine.org/go, and support page, quickfixengine.org/go/support, accessed 22 September 2026.
- Connamara Systems, "Connamara Systems Unveils Upgraded Commercial Support for QuickFIX", 12 July 2017, connamara.com, accessed 22 September 2026.
- QuickFIX/J project site, quickfixj.org, accessed 22 September 2026.
- QuickFIX/n project site, quickfixengine.org/n, and Connamara, "QuickFIX/n 1.13.0 now supporting .NET 8", connamara.com, accessed 22 September 2026.
Quazar statements are taken from quazar.org product and FAQ pages and from Quod Financial's launch announcement of 16 September 2026, accessed 22 September 2026. FIX and the other terms used here are defined in the glossary. QuickFIX is a trademark of its owners; this page describes publicly stated capabilities and makes no claim about relative cost.