Free · 100% Offline · macOS & Windows · ⚡ Parse 1M messages in 150ms

FIX Protocol Parser
for developers & traders.

Parse, inspect and debug FIX 4.2, FIX 4.4 and FIX 5.0 messages instantly on your desktop. Works with QuickFIX, Artio FIX, and any FIX engine log output. No cloud. Your data never leaves your machine.

🍎 macOS Apple Silicon · .dmg ↓ 🪟 Windows 64-bit · .zip ↓

Free forever · No sign-up · No usage limits

0
messages
parsed in one shot
0ms
parse time
for 1,000,000 messages
0 MiB/s
throughput
streaming parse
Simulating 1,000,000 FIX message parse… 150 ms
Criterion benchmark · Rust native binary · Apple M-series · single thread

See it in action

Watch how AI FIX Parser loads a million-message log, inspects orders, and surfaces session health issues — all offline, in seconds.

Simple, transparent pricing

Start free. Upgrade when you need advanced diagnostics.

Free
$0/ forever

Everything you need to parse and debug FIX logs — no sign-up, no limits.

  • ✓ Parse FIX 4.2, 4.4 & 5.0
  • ✓ Message timeline & tag inspector
  • ✓ CSV export
  • ✓ 100% offline — data never leaves your machine
Download Free
Most popular
Pro
$9.9/ month

Advanced session diagnostics and AI-powered insights for production FIX environments.

  • ✓ Everything in Free
  • ✓ Trade lifecycle reconstruction
  • ✓ FIX message validator
  • ✓ Session Health — 7 detection rules
  • ✓ Fill quality scorecard
  • ✓ Session summary & analytics
  • ✓ Order flow & pattern detection Soon
  • ✓ AI FIX Builder Soon
Get Pro

Everything you need to debug FIX protocol messages

Built for algo traders, FIX engine developers, and support engineers who work with FIX 4.2, FIX 4.4 and FIX 5.0 daily. Fully offline — your trading data stays on your machine.

🚀

Parse 1,000,000 FIX Messages in 150ms

Built in native Rust, FIX Studio blasts through 135 MB of log data in under 150ms — that’s 631 MiB/s of streaming throughput. Load a million-message production dump and get results before your coffee cools. No other FIX viewer comes close.

⚡ Criterion-verified  ·  1,000,000 msgs  ·  150ms  ·  631 MiB/s
📋

Message Timeline View

See every FIX message in chronological order with sender (SenderCompID), target (TargetCompID), MsgType badges, order details, and one-click selection.

🔍

Tag & Value Inspector

Click any FIX message to see all tag/value pairs with human-readable descriptions. Decodes MsgType, OrdStatus, Side, ExecType, TimeInForce and 150+ standard FIX tags.

📖

Built-in FIX Dictionary

Full tag reference for FIX 4.2, FIX 4.4 and FIX 5.0 — no external reference needed. Covers all standard tags across NewOrderSingle, ExecutionReport, OrderCancelRequest and more.

📝

Raw Text Export

Switch to Raw Text view for a clean, copyable representation of any parsed FIX message — perfect for support tickets, incident reports, and documentation.

🔒

100% Offline & Private

Your FIX log data never leaves your machine. No network calls, no telemetry, no cloud upload — everything is parsed locally. Safe for sensitive production order flow.

⚙️

Works with Any FIX Engine

Compatible with log output from QuickFIX, QuickFIX/J, Artio FIX, B2BITS, FIXIOM, and any engine that produces standard FIX 4.2 / 4.4 / 5.0 message strings.

🎨

Clean Dark UI

A minimal charcoal interface built for long debugging sessions. No distractions — just your data. Easy on the eyes during production FIX log analysis.

Frequently Asked Questions

Common questions about FIX protocol parsing and AI FIX Parser.

What FIX versions are supported?

AI FIX Parser supports FIX 4.0, FIX 4.1, FIX 4.2, FIX 4.4, FIX 5.0, FIX 5.0 SP1 and FIX 5.0 SP2 message formats. The built-in dictionary covers all standard tags across every version.

Does it support FIX 4.2?

Yes. FIX 4.2 is fully supported. All standard FIX 4.2 message types are decoded including NewOrderSingle (D), ExecutionReport (8), OrderCancelRequest (F), OrderCancelReplaceRequest (G), and more.

Does it support FIX 4.4?

Yes. FIX 4.4 is fully supported. AI FIX Parser decodes all FIX 4.4 tags and message types, including the additional fields introduced in FIX 4.4 such as CrossOrder and MultilegOrder.

Does it support FIX 5.0, FIX 5.0 SP1 and FIX 5.0 SP2?

Yes. FIX 5.0, FIX 5.0 SP1 and FIX 5.0 SP2 (the latest FIX standard) are supported. Note: there is no "FIX 5.2" — FIX 5.0 SP2 is the most recent version of the FIX protocol specification.

Can I parse QuickFIX or Artio FIX logs?

Yes. Paste raw FIX log lines from QuickFIX, QuickFIX/J, Artio FIX, B2BITS FIXIOM, or any FIX 4.2 / 4.4 / 5.0 engine and they are decoded instantly, fully offline.

What FIX message types are decoded?

All standard types: NewOrderSingle (D), ExecutionReport (8), OrderCancelRequest (F), OrderCancelReplaceRequest (G), MarketDataRequest (V), Heartbeat (0), Logon (A), Logout (5), and all other FIX 4.2/4.4/5.0 MsgTypes.

Does it send data to the cloud?

No. AI FIX Parser is 100% offline. No network calls, no telemetry. Your order flow and FIX logs never leave your machine.

Is it really free?

Yes — completely free, no subscription, no sign-up, no usage limits. Download and run on macOS or Windows.

What is the FIX protocol?

FIX (Financial Information eXchange) is the industry-standard messaging protocol for electronic trading. FIX 4.2 and FIX 4.4 are the most widely deployed versions across equities, derivatives, and FX order routing globally.

How is this different from a FIX engine?

A FIX engine (like QuickFIX or Artio FIX) connects to a counterparty and sends/receives orders. AI FIX Parser is a log viewer and debugger — it helps you understand and troubleshoot the messages your FIX engine produces.