Show HN: Diffview, a fast Git diff viewer written in Rust

A developer going by sleipner42 published Diffview, an open-source Git diff viewer written in Rust, posting it to Hacker News on August 21, 2026, per the Show HN thread.

The tool is available on GitHub and has a narrow, stated purpose: helping developers quickly skim through diffs. According to the Show HN post, Diffview adds a layer of prioritization on top of standard diff output — if a project's code is organized into folders named domain, use-case, application, and infra, the viewer will surface the domain folder's changes at the top, letting reviewers see the most consequential code first.

The author describes the motivation as a personal itch. "Even with LLMs, I still like to review my code manually," sleipner42 wrote in the Show HN submission. "However, I haven't found a good visual diff viewer for this, so I wrote one myself in Rust." No company affiliation, team size, or funding is mentioned in the source material.

Rust has become a common choice for developer tooling where performance matters — its memory safety guarantees and low overhead make it well-suited for tools that process large diffs quickly. Diffview sits in a space that already includes established options like git diff with pagers, delta, difftastic, and IDE-integrated diff views, though the author does not cite specific competitors. The folder-hierarchy prioritization feature appears to be the primary differentiator the project currently offers.

No roadmap, planned features, or broader expansion are mentioned in the available source material beyond the initial release.