Bring-your-own-model plugin for Office docs

Use your own model and prompts to process documents inside Word, Excel and PowerPoint

Problem

Developers are tired of the black-box, locked-in AI inside MS Office: one vendor decides which models you can use, where document data goes, and what the agent is allowed to do, with no source to inspect and no way to PR a feature. Many people are forced to use Office at work and simply have no choice. Coding agents already let you bring your own model — office docs have not caught up.

Solution

An Office add-in that opens up the AI layer: users plug in any OpenAI-compatible endpoint or local model, inspect and edit the prompt behind every action, and see exactly which model received which data. The core loop is select text, run an auditable operation, and roll it back in one click.

Users

Knowledge workers, legal, finance and consulting staff who are forced to use Office but are sensitive about model lock-in and data leakage

MVP

Word add-in with select-text, custom prompt, write-back loop; model config page accepting any endpoint and key; per-action log showing what was sent; one-click undo; a small library of starter prompts

Revenue

One-time purchase or yearly subscription; a business tier adds shared config and audit logs; sell per seat to company IT

Why now

More companies allow self-hosted and BYO models, yet the Office plugin ecosystem is almost entirely lock-in products; an indie dev can ship a usable version with Office.js in weeks