BuffSheets is a standalone Windows desktop app that works with live Excel workbooks. Describe what you want in plain English — add columns, build forecasts, clean data, create charts, structure financial models — and BuffSheets applies discrete changes to the file you open or attach. Accept to confirm, Reject to undo, and keep an audit log.
Generic AI tools hand you a formula in a copy-paste box and wish you luck. BuffSheets understands your selection and workbook context, plans structured actions, and executes them through Excel's live engine.
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uffSheets
BuffSheets builds a full balance sheet in Excel from a plain-English request — structured actions, live apply, professional formatting.
Analysts, finance teams, operators, founders — anyone who spends their day in tables, models, and reports.
Not advice — action. BuffSheets writes formulas, adds sheets, builds charts, deduplicates rows, fills blanks, and formats output in the workbook you open or attach. You keep Excel for the grid; BuffSheets is the AI workspace beside it.
On-device models via Ollama keep workbook data on your machine. Hosted cloud models — OpenAI, Anthropic, Google Gemini, xAI Grok — bring frontier reasoning, with a free tier and simple subscription plans. Same Excel engine either way; only the brain changes.
Every plan breaks work into discrete actions that apply as they run — Accept confirms, Reject undoes. Strict rules guard against destructive edits — no reckless full-sheet wipes, formula-first discipline for financial work. An audit BuffSheets Log sheet records exactly what was applied.
Create reusable Skills: Markdown instructions for how you want a task done — "Build a DCF," "Format like our firm's models," "Balance sheet layout." BuffSheets loads the right guidance automatically so outputs match your standards, not generic AI guesses.
Strong at tabular reasoning: YoY growth columns, revenue forecasts, assumptions blocks, summary sheets, charts, data cleanup, and structured model layouts — designed with spreadsheet conventions in mind: references, formulas, professional formatting.
A standalone Windows app — not an Excel add-in. Browse for a file or attach a workbook you already have open, then chat, plan, and apply without exporting CSVs to a browser tab.
Three steps between "I need this" and a finished sheet.
Highlight a range or work on the whole sheet. Type what you want: "Add a YoY % column with proper formulas" or "Build a conservative 5-year revenue forecast on a new sheet."
BuffSheets streams its reasoning and shows a structured action plan: what it is changing, where, and why — as discrete actions apply to the workbook.
Actions apply as they run. Use Accept to confirm items in the review list and Reject to undo. Every applied action is logged so you can refine and try again.
BuffSheets v1 ships as a direct download — a standalone desktop app. No Microsoft Store required. Windows only.
Sign in with your BuffSheets account, then download BuffSheets-Setup.exe. The installer is per-user and does not require admin rights.
Download for WindowsFollow the setup wizard. It installs the BuffSheets desktop app and local engine. Windows SmartScreen may warn on new publishers — choose Run anyway if you downloaded from app.buffsheets.com.
Open BuffSheets from the Start menu or desktop shortcut. Browse for an Excel file, or open one in Excel and pick it from the workbook menu. The local engine runs in the background.
On-device models work locally. For cloud models, sign in with the same account you use at app.buffsheets.com. Free tier includes a starter allowance; upgrade anytime from your account dashboard.
Optional: install Ollama for on-device models. The desktop app can download signed updates in-app; you can also re-download from your account.
Real prompts, real results — in your open workbook.
Models, forecasts, variance analysis, formatted outputs.
Transforms, summaries, charts, repeatable reporting.
Quick spreadsheet work without hiring a spreadsheet expert.
AI that respects structure, formulas, and auditability.
Most AI output looks like AI output. Skills fix that. Write a short Markdown file describing how your team builds a DCF, lays out a balance sheet, or formats a board deck export — and BuffSheets loads the right Skill automatically when the task calls for it.
# Build a DCF
## Layout
- Assumptions block at top, blue inputs
- Years across columns, FY labels in row 3
- FCF build: Revenue → EBITDA → NOPAT → FCF
## Rules
- Formulas only, never hardcoded values
- Terminal value via Gordon growth
- Sensitivity table: WACC × terminal growthNo vague "enterprise-grade" fluff. Here's exactly what leaves your machine and what doesn't.
Your workbook stays on your computer. Models run locally through Ollama — no cloud provider sees your data. Good for privacy-sensitive work and offline-style workflows.
Selected workbook context is sent to the model provider you choose — OpenAI, Anthropic, Google Gemini, or xAI Grok. Usage is metered and billed transparently through your plan.
Read the full Privacy Policy for data handling, retention, and your rights.
Start free. Upgrade when your workload grows. On-device models are always free.
Free
$0
free forever
Pro
$20/mo
for everyday spreadsheet work
Max
$100/mo
for power users & finance teams
All plans include the same Excel engine and safety rules. Manage billing from your account dashboard — the same login works in the desktop app.
BuffSheets v1 is a Windows desktop app that works with Excel workbooks on Windows. Mac and Excel on the web are not supported yet.
Changes apply as discrete actions. Use Accept to confirm and Reject to undo; an audit log records what ran. Safety rules still block reckless full-sheet wipes.
Yes for getting started: create a free account at app.buffsheets.com to download the installer and manage usage. On-device models then run locally; hosted cloud models use your free starter allowance or a Pro/Max plan.
Hosted requests may be logged to improve BuffSheets (prompt, context, plan, feedback). You can opt out in account settings.
BuffSheets is a separate desktop app purpose-built for structured, formula-aware edits with Skills, per-change control, an on-device option, and multi-provider model choice — tuned for analytical and financial spreadsheet work.
The Windows installer bundles the local BuffSheets engine — no separate Python setup. For on-device models, install Ollama separately. Hosted cloud models only need sign-in.
Get AI that works where you work — with review, undo, and an audit trail.
Download for WindowsFree Windows app · create a free account to get started