Tool comparison
Hex Editor Neo, from HHD Software, is a Windows binary editor engineered for performance on very large files, with unlimited undo/redo, fast search, and low memory overhead. It offers pattern and regular-expression searching, a structure viewer to overlay typed definitions on data, bookmarks, file comparison, and data operations such as fill, insert, and arithmetic. It can also disassemble code for several architectures in its higher editions. In ECU and firmware work it is used to open large reads, locate repeated map patterns, apply and track edits with a full history, and diff modified files against originals. Its combination of speed and structure awareness suits tuners and reverse engineers who work with sizeable memory images.
Notepad++ is a free, open-source source-code and text editor for Windows created by Don Ho, widely used for editing scripts, configuration files, logs, and CSV data. It is not a binary editor by default, but the popular HEX-Editor plugin adds a byte-level view so users can inspect and lightly patch binary files. In tuning workflows it is most useful for authoring and editing helper scripts, reading exported logs and reports, comparing text files with the Compare plugin, and, via the hex plugin, glancing at raw dumps. Its tabbed interface, syntax highlighting, regex search, and plugin ecosystem make it a convenient utility around a tuning toolchain, even though dedicated hex editors are better for serious firmware work.
Hex Editor Neo (Hex Editor / Reverse Engineering, HHD Software) and Notepad++ (Hex Editor / Reverse Engineering, Don Ho (open source)) compete in the same space, so the choice comes down to coverage, workflow and price for your specific ECUs. Windows hex editor built for very large files, patterns and structures Free Windows code editor with a hex-editor plugin for binary viewing
Whichever you flash with, Softechpro Solutions auto-applies DPF/EGR/AdBlue/DTC-off modules and Stage patterns with automatic checksum correction across ~1,400 firmwares on Windows & macOS — the fast way to get the actual file edits done.
See SoftechproMore on Hex Editor Neo