GitHub - flamestro/deff: interactive, side-by-side file review for git diffs with per-file navigation, vertical and horizontal scrolling, syntax highlighting, and added/deleted line tinting
Hacker News
February 26, 2026
AI-Generated Deep Dive Summary
Deff is a new Rust-based TUI tool designed to simplify interactive file review of git diffs. It offers side-by-side comparison, independent scrolling, syntax highlighting, and tinting for added/deleted lines, making it easier to spot changes quickly. The tool supports both upstream-ahead strategy for comparing local branch changes against their upstream range and explicit --base/--head comparisons. Additionally, its optional --include-uncommitted mode allows developers to review uncommitted changes and untracked files before committing.
Deff is particularly useful for tech enthusiasts and developers who work with complex codebases or collaborate in teams. Its integration with git makes it a valuable addition to the development workflow. The tool’s flexibility in comparing changes against different branches or commits, combined with its intuitive interface and keyboard navigation (including Vim-like shortcuts), ensures efficient code reviews. Developers can also search for specific patterns within diffs using / + Enter and navigate matches with n/N.
Deff is easy to set up, requiring only a Rust toolchain and an interactive terminal. It can be installed via a script or built locally, making it accessible to developers of all skill levels. The tool’s support for themes (dark, light, or auto) ensures compatibility with various terminal environments, enhancing readability in different settings.
For tech teams, Deff stands out as a time-saving solution for code reviews. Its ability to highlight changes and allow side-by-side comparisons reduces the risk of missing critical issues during code reviews. By streamlining the review process, Deff helps maintain code quality and efficiency, making it an essential tool for developers who prioritize accuracy and speed in their work.
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Originally published on Hacker News on 2/26/2026