CharFloat – Desktop Document Bridge for AI

Let AI edit the document you already have open, no upload/download

Problem

Using AI on documents and spreadsheets usually means uploading the file, having the model read it in the background, and downloading a regenerated copy. The original file is never touched, and complex formatting, merged cells, and formulas often break in the rewrite.

Solution

An MCP bridge that connects AI clients to your open local document window so the AI edits in place, sharing the same UI, preserving original formatting and formulas.

Users

Knowledge workers in ops, finance, and admin who regularly run AI on Word/Excel documents

MVP

Support one app in one major office suite (e.g. spreadsheets); expose read/edit endpoints as an MCP server; write changes without altering original formatting; confirm before edits with undo; run fully locally

Revenue

Subscription at $5–8/month or a $39 one-time license; separate pricing for on-prem enterprise deployments

Why now

The MCP ecosystem is expanding fast and AI clients now support local tool calls, while office documents remain the highest-frequency upload/download pain point