Accelerate coding of Financial flat file specs

Rapidly capture flat file layouts and generate in multiple programming languages. You can instantly download file reader / writer source code for public specifications or rapidly prototype your own with our rapid data entry interface.

How does it work?

  • Simple data entry interface to capture specification definition.
  • Quickly generate code to read and write flat files faster.
  • Automatically generate production-ready software in multiple programming languages.
  • Reduce compliance project turnaround time by reusing public specifications like IRS, Community Reinvestment Act, et cetera
  • Contribute to Open Source projects or keep private repositories with subscription

See it in action

Source Code created by Class Builder

Output Code features

  • Easy to use
  • Comment-rich code for easy maintenance
  • Validate field lengths add up to record length
  • Validation of field data type
  • Constraints by custom value lists
  • Supports hierarchical data
  • Compare Control and Aggregate records
  • Define internal sub-field layouts within field


  • Download pre-defined formats
  • Rapidly map your own specifications
  • Reduce time to market by building with best practices
  • Delegate to Business Analysts instead of Engineers
  • Expedite testing
  • Dramatically reduce failed unit tests