Show HN: SheetMog – OSS Excel alternative and headless SDK

SheetMog, an open-source Excel alternative and headless SDK, has been released as a spreadsheet engine, app runtime, and SDK stack for building workbook-aware agents, automations, and embedded spreadsheet experiences. The project, available at mog.shortcut.ai, provides both a Node.js SDK for headless workbook automation and an embed SDK for browser, React, and Web Component integrations. SheetMog is licensed under MIT and includes a Rust compute engine, kernel services, and public TypeScript contracts.

Mog is a spreadsheet engine, app runtime, and SDK stack for building workbook-aware agents, automations, and embedded spreadsheet experiences. Try it live at mog.shortcut.ai https://mog.shortcut.ai/ . | I want to... | Start here | Useful command | |---|---|---| | Build Mog from source | | pnpm typecheck Use Mog as a library use-mog-as-a-library pnpm add @mog-sdk/node Develop Mog develop-mog pnpm check:publish-readiness:fast Use @mog-sdk/node for headless workbook automation in Node.js and agent workflows. pnpm add @mog-sdk/node js import { createWorkbook } from '@mog-sdk/node'; const wb = await createWorkbook ; const ws = wb.activeSheet; await ws.setCell 'A1', 42 ; await ws.setCell 'A2', '=A1 2' ; console.log await ws.getCell 'A2' ; await wb.dispose ; Use @mog-sdk/embed for browser, React, and Web Component embeds. See: This is a large monorepo. Start with the package or surface you are changing, then run the smallest relevant verification gate. Use dev-v0.7.2 as the exclusive development branch for this repo unless a task explicitly names another branch. Do not base new local work on dev . pnpm install --frozen-lockfile pnpm typecheck pnpm test cargo check -p compute-core --lib --locked cargo test -p compute-core --locked Common package checks: pnpm --filter @mog-sdk/node test pnpm --filter @mog-sdk/embed test pnpm --filter @mog-sdk/sheet-view test pnpm check:publish-readiness:fast pnpm check:external-fixtures CI and non-eval publish readiness gates are documented in CI Gates /fundamental-research-labs/mog/blob/main/docs/development/ci-gates.md . If you are a coding agent, read AGENTS.md /fundamental-research-labs/mog/blob/main/AGENTS.md before editing code. | Area | Paths | |---|---| | Spreadsheet app | runtime/spreadsheet-app , apps/spreadsheet , shell | | Node SDK | runtime/sdk | | Embeds | runtime/embed , views/sheet-view | | Rust compute engine | compute/core | | Public TypeScript contracts | contracts | | Kernel and services | kernel | | External consumer fixtures | fixtures/external | | Architecture docs | docs | MIT. See LICENSE /fundamental-research-labs/mog/blob/main/LICENSE .