Kristoffer Nordström builds developer tools and consumer applications, including diffviewer, a Git review interface for agent-written code, and Splitright, a shared-expense app. His professional account identifies him as a member of technical staff at Andon Labs.[1][2][3][4]
Start with Diffview, a fast Git diff viewer written in Rust →
Links
GitHub 
X Splitright Member of technical staff · Andon Labs
Contributions
Review the change before staging it
diffviewer groups changes by architectural layer and puts tests last, helping a reviewer follow a change through a codebase. Side-by-side diffs, word-level emphasis, hunk navigation and Python symbol lookup support inspecting the implementation. A reviewer can stage files as they go or inspect a commit range without modifying the working tree.[2]
Shared expenses without individual accounts
Splitright tracks who paid, who participated and which currency an expense used, then nets balances into settlements. A group code grants access to its shared records. Its documentation explains that this convenience also means anyone holding the code may view or change the group; local archives do not guarantee recovery.[5]
Ideas
In commit-range mode, diffviewer records which files have been read. Those marks depend on both sides of each diff: if the implementation or base changes, affected files become unread again. The interface uses the Git command line beneath its review surface, retaining the repository’s hooks and configuration.[2]
Tools, writing & talks
Writing, research & talks
Start here
A keyboard-driven Git diff reviewer with architectural grouping, staging and read-only commit-range review.
Read a small committed change in range mode. Follow the architecture grouping and read markers before using the staging workflow; Git familiarity helps.
Developer[1][2]Original source
Apps
- Splitrightsleipner42.github.io
A group-expense app using shared access codes, currency conversion and net settlements.