Altova DiffDog vs NextDiff
Altova DiffDog
altova.comNextDiff
tkosoft.comSide by side
| Figure | Altova DiffDog | NextDiff |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Windows | Yes | Yes |
| Plans published | 2 | 1 |
| Spec score · File Comparison Software | 8.3 (#4) | 7.0 (#27) |
| Intended users | Altova describes DiffDog as a technical diff/merge tool for developers and IT professionals. | The maker describes its tools as designed to be simple for everyday users while offering depth and reliability for professionals. |
| Purpose | DiffDog compares and merges text and source-code files, XML and JSON files, Word documents, directories, and database schemas and content. | NextDiff compares two files, text documents, source code files, or folders on Windows. |
Plans
Altova DiffDog
- DiffDog 2026 Professional Edition$189, paid once
- DiffDog 2026 Enterprise Edition$269, paid once
In their own words
Altova DiffDog
Altova DiffDog has no write-up on Specifiction yet; its figures are above.
NextDiff
NextDiff is a free Windows utility for comparing files, text documents, source code, and folders. It places text files side by side, marking changed lines and changes inside lines. Folder comparisons include subfolders, reveal files found on only one side, and can identify the newer file. You can edit text in the comparison view, copy differences in either direction, and undo recent merge or editing actions. Comparison settings can ignore letter case, whitespace, leading or trailing spaces, and blank lines. Supported encodings include ANSI, ASCII, UTF-8, UTF-8 with BOM, and UTF-16. Optional Apache Tika support extracts readable text from PDF, DOCX, XLSX, and PPTX files for comparison. Version 2.2 is dated September 23, 2026. NextDiff is freeware for personal and commercial use on Windows 10 and 11, with direct installer links and no account or email requirement.