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.
UltraEdit by IDM Computer Solutions is a veteran commercial text editor that also includes a full hex-editing mode, letting users switch between text and byte views of the same file. It handles very large files, offers powerful search-and-replace including regular expressions, column editing, and scripting/macros for automating repetitive changes. In tuning and firmware contexts it is used to view and edit binary reads in hex, search for byte or ASCII signatures such as ECU identifiers and software numbers, and script bulk edits across files. While not a dedicated reverse-engineering suite, its blend of robust text tooling and a capable hex mode makes it a practical everyday editor for people who work across scripts, logs, and binaries. It runs on Windows, macOS, and Linux.
Hex Editor Neo (Hex Editor / Reverse Engineering, HHD Software) and UltraEdit (Hex Editor / Reverse Engineering, IDM Computer Solutions) 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 Text and hex editor with a column-mode hex view for binary files
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