FF-16-TUI (Find Frequent 16-bit Text User Interface) is an interactive static analysis tool designed to locate frequently occurring local 16-bit patterns across entire files. It aids in understanding file layout by identifying structural elements from recurring patterns. The tool operates via command line with optional dictionary input and features a text user interface divided into hexdump, pattern, and filter panels.

Keyboard shortcuts enable navigation and pattern highlighting, with keys 0–9 selecting patterns from most to least frequent. Filter controls adjust parameters like minimum/maximum gaps, set bits, and threshold. Key terms include 'Ones' (number of set bits), 'Freq' (pattern frequency), and 'Dict' (dictionary entry).

FF-16-TUI is released under the MIT license and hosted on GitHub under the HexLasso organization.