Backed by Y Combinator

Let your agent edit word documents while maintaining styling & formatting.

from vespper import read_document, edit_document

# Load .docx as clean HTML
html = read_document("contract.docx")

# Apply tracked edits as Word suggestions
edit_document("contract.docx", {
    "old": "<p>First party</p>",
    "new": "<p>Acme Corp</p>"
})

Made by professionals from

More accurate, 3x faster and 3x cheaper

Same task. One call vs. hundreds of lines of XML wrangling.

Using Vespper

1.3s

Using python-docx

14s+ · fails

Better, Cheaper & Faster..

Built for .docx at scale. Vespper is magnitudes better, cheaper and faster than calling general-purpose models on the same document tasks.

Cost Index7/19/2026

Awaiting results

We're running head-to-head quality benchmarks against python-docx and frontier models on real .docx workloads. Results will be published here.

Quality IndexComing soon

Awaiting results

We're running head-to-head quality benchmarks against python-docx and frontier models on real .docx workloads. Results will be published here.

Latency IndexComing soon

Awaiting results

We're running head-to-head quality benchmarks against python-docx and frontier models on real .docx workloads. Results will be published here.

Vespper v1.0 pricing, July 2026. Per-document cost assumes 100 pages of dense Word markup. Full methodology in the docs.

Kickstart your next agent with production-ready templates.

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Example

Sample Word add-in

A complete Office add-in that brings agentic document editing directly into Microsoft Word.

Example

List tracked changes

Coming soon

Extract every insertion, deletion, and move from a document's revision history as structured data.

Example

Compare docs

Coming soon

Compare two Word documents and surface differences as clean HTML diffs with change metadata.

Example

Mail merge agent

Coming soon

Generate personalized Word documents from a spreadsheet of recipients, tracked and reviewable.

View all examples

Frequently asked questions

In progress. Vespper is built with enterprise security in mind, and our systems are in progress to being SOC 2 compliant. This ensures your data is handled with the highest standards of confidentiality and integrity.

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Share what you're building, ask questions, and see how other teams use Vespper with their agents.

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