Surgical by default
Only what you changed is rewritten. Charts, pivots, macros, themes: byte-for-byte.
Native Excel editing
Edits your Excel files. Keeps everything else intact.
Most AI tools re-export your whole file and quietly shred what
they don't understand. GridPath's native Rust patcher edits the
.xlsx package itself — only what changed.
References follow your edits
Row and column changes shift formulas, named ranges, chart series, and comments across the whole package.
Checked before it's written
A save that wouldn't open cleanly in Excel is never written at all.
No silent loss
An edit that can't be surgical gets named losses and an untouched original — never a quiet overwrite.
Excel stays the authority
Formulas recalculate on open. Your numbers come from Excel's engine, not ours.
Measured, not promised
Benchmarked against a CLI coding agent running the same Claude model: GridPath byte-clean in 10 of 10 runs, including a 918 KB institutional bank model — while the library-based path silently dropped content in 5 of 5 runs on the test workbook. The numbers, and how to reproduce them.
Try it on a real workbook.
Free with your Claude or ChatGPT subscription.