FIX Companion

Make sense of the messages behind an order. FIX Companion brings a searchable FIX 4.4 handbook and hands-on practice into one focused app. Look up a field, understand its values, and use what you learn in a message. A HANDBOOK FOR EVERYDAY REFERENCE Search by tag number, field name or message type. Explore 953 field reference entries, with historical fields clearly marked. Read definitions, data types, defined values and worked examples together, so a tag makes sense in context. UNDERSTAND THE CONVERSATION Explore message structures, reusable components and value formats. Follow guided flows from order submission through acceptance and fills. See how tags and values describe an event, an order state and the quantity remaining. PRACTICE WHAT YOU LEARN Choose a value, recall one without answer choices, find a mismatch in a message, and put an order flow in sequence. Explanations help connect the answer to the underlying concept. Short lessons give you a place to start before you practice. KEEP USEFUL REFERENCES CLOSE Save fields for quick access and revisit concepts as you learn. Choose White or Pitch black to suit the way you read. READY OFFLINE The reference content and practice are bundled with the app. You can look up tags and learn without a network connection. Built for developers, QA engineers, support teams and anyone learning how FIX messages work.