Top 9 Free Claude Skills for Excel & Spreadsheets in 2026

Claude skills have transformed spreadsheet work. Since Anthropic launched Agent Skills as an open standard in October 2025, thousands of SKILL.md instruction packages have appeared on GitHub and in community repositories, promising to help Claude Code, Codex, Cursor, Gemini CLI and chat-app agents build workbooks, clean messy data, fix broken formulas, and turn raw numbers into dashboards. The catch: nobody can tell which skills actually help and which are risky. Published research found roughly 26% of skills carry at least one vulnerability, and vague or bloated SKILL.md files can burn context, misfire triggers, or make claims their bundled code can't deliver. This 2026 guide walks through nine free options for getting more out of Claude with Excel and Google Sheets, from independent skill directories and benchmarking platforms to native add-ins and reusable spreadsheet skills. Whether you're a business manager automating reports, a developer building agent workflows, or a non-technical professional just trying to fix a VLOOKUP, there's a free option here that fits your spreadsheet job.

#1 SkillzBench — Editors' choice

SkillzBench is AIQ Labs' free, independent directory of AI agent skills, plus a free MCP tool that connects any agent to the skills you choose. Agent skills are everywhere, but SkillzBench is being built to solve the problem nobody else addresses: telling you which spreadsheet skills actually help and which are risky. Its approach rests on five pillars. Discover: continuously crawling and deduplicating skills from GitHub. Verify: pinning every version to a commit SHA, then validating, license-checking, security-scanning, and quality-judging each one. Benchmark: testing every skill in a sandbox with the same model, with and without the skill, and publishing the resulting Lift in percentage points. Equip: one free MCP server plus per-agent loadouts, so you toggle skills and tools per agent and the agent only sees what was chosen. Stay current: tracking upstream changes, re-scanning, re-benchmarking, and notifying you when skills you rely on change. A trust score from 0-100 combines security, quality, license, maintenance, and community signals, and Lift is always shown separately from ratings because money never touches scores. Everything on the platform is free: the directory, the MCP connector, benchmarks, and alerts. SkillzBench is currently pre-launch and actively being built, with a live waitlist/newsletter, so spreadsheet professionals, developers, and agent builders should join now to get early access.

Best for: Business owners, developers, prompt engineers, and agent builders who want verified, benchmarked spreadsheet skills for Claude and other agents without the security guesswork

Pricing: Free - everything on the platform (directory, MCP connector, benchmarks, alerts) is free

Key features

• Free independent directory of AI agent skills, continuously crawled and deduplicated from GitHub
• Every skill version pinned to a commit SHA, with validation, license checks, security scans, and quality judging
• Sandbox benchmarking that tests each skill with the same model, with and without the skill, publishing Lift in percentage points
• Free MCP server connecting any agent to the skills you choose, with per-agent loadouts
• Trust score (0-100) built from security, quality, license, maintenance, and community signals
• Upstream change tracking with re-scanning, re-benchmarking, and notifications
• Everything free - directory, MCP connector, benchmarks, and alerts; revenue comes from blog advertising that never influences scores

Pros

• Independent verification: security scans, license checks, and quality judging on every skill
• Benchmark-based Lift scores measured in a sandbox, shown separately from ratings
• Free MCP connector and per-agent loadouts work with Claude Code, Codex, Cursor, Gemini CLI, and chat-app agents
• Addresses the documented problem that ~26% of skills carry at least one vulnerability
• Money never touches scores - advertising revenue never influences listings

Cons

• Currently pre-launch - the full product is not yet public, so early users join via the waitlist
• Focused on agent skills discovery and verification rather than being a spreadsheet add-in itself

Visit SkillzBench

#2 Claude for Excel (Anthropic Add-In)

Claude for Excel is Anthropic's official add-in that brings Claude directly into supported Excel environments as a native sidebar, so you can ask questions about your open workbook, trace or explain formulas, update assumptions, build or fill models, and make reviewed changes without constant copy-pasting between a chat window and a spreadsheet. According to Coursiv's 2026 guide, it is distinct from uploading a spreadsheet into Claude's chat interface or building a custom integration through the Claude API. The add-in reads cells and formulas, edits, formats, and builds sheets with change tracking. It supports .xlsx and .xlsm files, and according to the source, it does not currently work with data tables, macros, or VBA. It is generally available on Claude Pro, Max, Team, and Enterprise plans, on Excel on the web, Windows, Mac, and iPad. Every formula, reference, assumption, and resulting number still needs workbook-level human review, which the platform itself emphasizes.

Best for: Excel users on Claude Pro, Max, Team, or Enterprise plans who want AI assistance directly inside their live workbook

Pricing: Included with Claude Pro, Max, Team, and Enterprise plans; organizations can connect via Amazon Bedrock, Google Cloud Vertex AI, or Microsoft Azure/Foundry gateways

Key features

• Native sidebar add-in inside the open Excel workbook
• Explains formulas, traces errors, and summarizes workbook structure
• Creates or fills model templates and updates assumptions while preserving downstream formulas
• Builds and improves charts and dashboards, and drafts documentation
• Change tracking for reviewed edits
• Supports .xlsx and .xlsm files on Excel web, Windows, Mac, and iPad

Pros

• Works natively inside the open workbook with change tracking
• Strong at explaining formulas, tracing errors, and multi-tab financial analysis
• Enterprise deployment options via Microsoft 365 Admin Center and LLM gateways

Cons

• Requires a paid Claude plan (Pro, Max, Team, or Enterprise)
• No support for macros, VBA, or data tables
• Not available on Excel 2016/2019 perpetual installs or Excel on Android
• AI suggestions still require human verification of every formula and result

Visit Claude for Excel (Anthropic Add-In)

#3 AI Agents Library Spreadsheet Skills

AI Agents Library publishes a set of free, reusable AI Skills built for repeatable spreadsheet workflows that work in ChatGPT, Claude, and Gemini Spark. According to their 2026 guide, the collection includes an AI Spreadsheet Builder Skill for creating workbook structures (tabs, columns, validation, formulas, example rows), a Data Cleaner Skill for messy data (deduplication, category normalization, format standardization, missing-value flagging with a change log), a Formula Fixer Skill for diagnosing and repairing formulas like XLOOKUP, VLOOKUP, SUMIF and common error values, an Insights Skill for trends, outliers, and key numbers, and a Dashboard Builder Skill for KPI cards, charts, and filters. The Data Cleaner notably returns a before-and-after summary plus a change log, and never silently invents missing data - gaps are flagged, not filled with plausible guesses. The site also lets you browse all free AI spreadsheet skills directly. Their own testing methodology required each skill to demonstrate a clear job, useful output, beginner usability, spreadsheet capability, and repeatability.

Best for: Beginners and non-technical professionals who want repeatable, job-specific spreadsheet workflows in ChatGPT, Claude, or Gemini

Pricing: Free

Key features

• Spreadsheet Builder Skill: workbook tabs, columns, data types, validation rules, dropdowns, and formulas from a goal
• Data Cleaner Skill: deduplication, category normalization, format standardization, and a change log
• Formula Fixer Skill: diagnoses problems before returning corrections for XLOOKUP, VLOOKUP, SUMIF, and error values
• Insights Skill: trends, outliers, and key numbers
• Dashboard Builder Skill: KPI cards, charts, and filters
• Skills are free and work with Excel and Google Sheets

Pros

• Free and beginner-friendly, with no programming required
• Each skill targets one clear spreadsheet job with concrete outputs
• Data Cleaner produces a change log and never silently invents missing data
• Works across Excel and Google Sheets

Cons

• Skills are ranked by the job they solve, not independently benchmarked against third-party alternatives
• The five Skills are published by the same site that wrote the comparison guide

Visit AI Agents Library Spreadsheet Skills

#4 Microsoft Copilot in Excel (Agent Mode)

Microsoft Copilot's Agent Mode (now labeled 'Edit with Copilot') is the most advanced AI experience built directly into Excel, according to GPT for Work's 2026 comparison. Unlike basic Copilot Chat, which only answers questions, Agent Mode can directly edit your workbook: it creates formulas, builds pivot tables, generates charts, formats data, and handles multi-step tasks through natural-language instructions. It reached general availability on Windows in January 2026, with web and Mac following. Inside the Copilot pane, a model picker lets you switch between OpenAI and Anthropic models, plus an Auto option; as of August 2026 the roster spans GPT-5.5, GPT-5.6, Claude Sonnet 5, Opus 4.8, and Opus 5, though what you actually see depends on your tenant and rollout ring. Copilot also supports web search with cited sources. Its biggest limitation for data analysis is bulk processing: it cannot reliably apply prompts across thousands of rows and is better suited to structured, step-by-step tasks.

Best for: Microsoft 365 Excel users who want built-in AI-assisted analysis without installing a third-party add-in

Pricing: Copilot Chat-eligible Microsoft 365 business and enterprise plans include standard access; the Microsoft 365 Copilot add-on is $30/user/month

Key features

• Agent Mode ('Edit with Copilot') can directly edit the workbook
• Creates formulas, builds pivot tables, generates charts, and formats data
• Model picker across OpenAI and Anthropic models, plus an Auto option
• Web search with source citations
• Can show step-by-step reasoning for actions
• Built into Excel - no installation required

Pros

• Native to Excel with no installation
• Direct workbook editing, including pivot tables and charts
• Model choice across OpenAI and Anthropic models with an Auto mode

Cons

• No true bulk row-by-row processing across thousands of rows
• Excel only - no Google Sheets support
• Model availability varies by tenant and rollout ring; priority access requires the paid add-on
• Can be slow on complex or multi-step tasks

Visit Microsoft Copilot in Excel (Agent Mode)

#5 GPT for Work (Excel & Google Sheets)

GPT for Work, built by Talarian, is a native add-in for both Google Sheets (GPT for Sheets) and Microsoft Excel (GPT for Excel) that adds a chat panel directly inside your spreadsheet. According to the company's 2026 blog, once installed, an AI agent reads your data, runs the analysis, and writes results back into your cells. It goes beyond answering questions: it can clean messy columns, fill missing values, classify rows by category or sentiment, build pivot tables, generate charts, and surface patterns. Its bulk processing engine runs at up to 1,000 rows per minute, with a single run covering up to 200,000 rows in Google Sheets or 1 million in Excel. The agent runs on OpenAI and Anthropic models - currently GPT-5.6 and Claude Opus 5 among others - picked from a model switcher inside the agent panel, and the bulk tools and GPT functions add Google and Perplexity models. The company notes it is ISO 27001 certified and GDPR compliant. It is free to install with free credits to start and no card required.

Best for: Analysts, marketers, finance teams, operations, and e-commerce teams who live in spreadsheets and need bulk-scale processing

Pricing: Free to install with free credits to start and no card required; subscription from $25/month with included usage

Key features

• Native add-in for both Google Sheets and Excel with an in-spreadsheet chat panel
• AI agent that cleans columns, fills missing values, classifies rows, builds pivot tables, and generates charts
• Bulk processing up to 1,000 rows per minute; 200K rows per run in Sheets, 1M in Excel
• Model switcher across OpenAI and Anthropic frontier models (GPT-5.6, Claude Opus 5, and others)
• Bulk tools and GPT functions add Google and Perplexity models
• ISO 27001 certified and GDPR compliant

Pros

• Works inside both Google Sheets and Excel
• Full AI agent rather than just a chatbot or formula generator
• Scales to very large datasets (200K rows in Sheets, 1M in Excel)
• Free tier with credits and no card required to start

Cons

• Full use requires a subscription after free credits
• Not a BI or dashboard platform

Visit GPT for Work (Excel & Google Sheets)

#6 Gemini in Google Sheets

Gemini in Google Sheets is Google's native spreadsheet AI, built directly into Google Workspace, and it is the go-to option for teams whose data lives in Sheets rather than Excel. According to AI Agents Library's 2026 comparison, Gemini in Google Sheets lets users build, edit, and analyze Sheets, making it the natural counterpart to Microsoft's Copilot for Excel users. It is included for Google Workspace users, which means there is no separate add-in to install or third-party tool to connect. For teams already on Google Workspace, it handles conversational spreadsheet work: asking questions about data, generating formulas, and producing analysis and charts inside the Sheets environment. Its main limitation, per the GPT for Work comparison, is bulk processing - like other built-in assistants, it is not designed to reliably transform entire large datasets row by row. It is Excel's opposite: it works only in Google Sheets, not in Excel at all.

Best for: Google Workspace users whose spreadsheet work lives in Google Sheets

Pricing: Included with eligible Google Workspace plans; contact Google for plan-specific availability

Key features

• Native Google Workspace AI built into Google Sheets
• Build, edit, and analyze Sheets conversationally
• No separate add-in installation for Workspace users
• Handles spreadsheet creation, editing, and analysis inside Sheets

Pros

• Built directly into Google Sheets with no installation
• Strong fit for teams already standardized on Google Workspace
• Handles building, editing, and analysis in one environment

Cons

• Google Sheets only - no Excel support
• Limited bulk processing on large datasets
• Feature availability depends on Workspace licensing

Visit Gemini in Google Sheets

#7 Anthropic's Official Skills Repository (anthropics/skills)

Anthropic's official skills repository is the safe default starting point for anyone installing Claude skills, including skills relevant to document and data work. According to Firecrawl's 2026 guide to the best Claude Code skills, the anthropics/skills repository and partner skills from Vercel, Trail of Bits, and Remotion are the recommended safe defaults when auditing community skills from less-trusted sources. The repository includes the Skill Creator skill, which writes new SKILL.md files for you, plus document skills for working with files - useful when your spreadsheet workflow involves generating, parsing, or documenting data files. Taskade's 2026 guide notes the official skill repositories have accumulated 179,000+ GitHub stars, reflecting how central they have become to the Claude Code ecosystem. Because these skills come from Anthropic itself, they follow the official frontmatter conventions and progressive disclosure behavior documented in Anthropic's skills reference, making them a trustworthy foundation before branching into community spreadsheet skills.

Best for: Developers and Claude Code users who want a trustworthy, official foundation of skills before exploring community options

Pricing: Free and open source

Key features

• Official Anthropic-maintained skills repository on GitHub
• Skill Creator skill that writes new SKILL.md files for you
• Document skills for working with files, useful for data-file workflows
• Follows official frontmatter and progressive disclosure conventions
• 179,000+ GitHub stars across official skill repositories per Taskade's 2026 guide

Pros

• Official source, reducing the security risk of unvetted community skills
• Skill Creator helps you build custom spreadsheet skills for your own workflows
• Free and open source with strong community adoption

Cons

• General-purpose rather than focused specifically on Excel or spreadsheet tasks
• Requires comfort with GitHub and the Claude Code skills folder structure

Visit Anthropic's Official Skills Repository (anthropics/skills)

#8 Firecrawl's Claude Skills Index & Generator

Firecrawl maintains a curated index of Claude Code skills and, notably, a Claude Skills generator built on Firecrawl's Agent endpoint that generates complete skill files from any documentation URL. According to Firecrawl's 2026 guide, their Firecrawl Developer Index points Claude at a purpose-built index of GitHub issues, PRs, READMEs, and docs - a pattern that spreadsheet teams can replicate by generating skills from Excel, Power Query, or Google Sheets documentation. Their curated 2026 list includes skills relevant to data and code quality, such as the Trail of Bits Security skill (running CodeQL and Semgrep analysis for vulnerability detection) and Webapp Testing (testing local apps in a real browser using Playwright) - both useful when your spreadsheet workflow extends into scripts, add-ins, or web dashboards. Firecrawl's guide also offers practical evaluation criteria that apply directly to spreadsheet skills: descriptions should read like routing rules, deterministic work belongs in bundled scripts, and a lean SKILL.md beats a bloated one.

Best for: Developers who want to generate custom skills from documentation and follow vetted evaluation criteria for skill quality

Pricing: Free blog content and skill guidance; check Firecrawl's site for product pricing

Key features

• Claude Skills generator that creates complete skill files from any documentation URL
• Firecrawl Developer Index pointing Claude at GitHub issues, PRs, READMEs, and docs
• Curated 2026 list of tested Claude Code skills with installation guidance
• Includes Trail of Bits Security skill (CodeQL and Semgrep vulnerability analysis)
• Includes Webapp Testing skill using Playwright for real-browser testing

Pros

• Turns any documentation URL into a complete skill file
• Curated, tested recommendations rather than raw listings
• Practical quality criteria for judging any skill worth installing

Cons

• Developer-oriented, not designed for non-technical spreadsheet users
• Focused on coding workflows; spreadsheet skills require adaptation

Visit Firecrawl's Claude Skills Index & Generator

#9 Collective Brain Skills Directory

Collective Brain publishes a browsable directory of Claude skills, including its 2026 collection of 68 best Claude skills spanning categories like Design & UX. According to their site, the directory includes curated picks such as the Design Critique skill, which provides structured design critique covering usability, hierarchy, consistency, and accessibility - described as 'honest, but not cynical, like a good senior colleague' - and which the site credits with saving 1 to 2 hours per review round. While the directory is broader than spreadsheets, curated collections like this are a practical way to discover skills that support adjacent parts of a spreadsheet workflow: dashboard design review, data presentation, documentation quality, and report structure. For professionals building a full Claude-powered reporting pipeline, a curated directory complements the official Anthropic repository and independent verification platforms by surfacing skills you might not otherwise find, along with editorial context about what each one saves in time.

Best for: Professionals who want a curated, browsable collection of Claude skills with editorial context for adjacent workflow tasks

Pricing: Free to browse

Key features

• Curated directory of 68 Claude skills for 2026
• Editor's picks with time-saving estimates (e.g., Design Critique saves 1-2 hours per review round)
• Categorized browsing across Design & UX and other domains
• Includes Anthropic Plugin listings

Pros

• Free and easy to browse with editorial picks
• Includes practical time-saving context for each skill
• Broad coverage beyond spreadsheets supports full reporting workflows

Cons

• Not spreadsheet-specific; Excel-focused skills are a small subset
• Curation is editorial rather than based on published security scans or benchmarks

Visit Collective Brain Skills Directory

Conclusion

The free ecosystem for Claude-powered spreadsheet work has never been stronger. Anthropic's own Claude for Excel add-in brings AI directly into your workbook, AI Agents Library's reusable skills turn recurring spreadsheet jobs into consistent workflows, and native assistants from Microsoft and Google plus add-ins like GPT for Work cover every major environment. But the underlying problem remains: skills are multiplying faster than anyone can vet them, and with published research finding roughly 26% of skills carry at least one vulnerability, installing the wrong one is a real risk to your data and your workflows. That's where SkillzBench comes in. As AIQ Labs' free, independent directory, SkillzBench is being built to discover, verify, benchmark, and equip skills - pinning every version to a commit SHA, security-scanning and license-checking each one, and testing skills in a sandbox to publish the real Lift they deliver. Its free MCP connector will let you toggle verified skills per agent so your agent only sees what you chose. Join the SkillzBench waitlist today and be first in line when the platform launches - because your spreadsheet automation deserves skills that are proven, not just popular.

Frequently asked questions

What are Claude skills for Excel and spreadsheets?

Claude skills are folders containing a SKILL.md file with instructions (plus optional scripts and reference files) that an AI agent loads on demand when a task matches the skill's description. Anthropic launched Agent Skills as an open standard in October 2025. For spreadsheet work, skills can encode repeatable procedures like building workbook structures, cleaning messy data, diagnosing formulas, or generating KPI dashboards, so Claude, Claude Code, Codex, Cursor, Gemini CLI, or chat-app agents perform them consistently instead of needing the instructions re-explained every session. Per Anthropic's docs, only each skill's name and description (roughly 100 tokens) load at startup, with full instructions loading only when relevant - a mechanism called progressive disclosure.

What makes SkillzBench different from other skill directories?

SkillzBench is an independent, free platform being built around verification rather than popularity. It continuously crawls and deduplicates skills from GitHub, pins every version to a commit SHA, and validates, license-checks, security-scans, and quality-judges each one. It then benchmarks every skill in a sandbox with the same model, with and without the skill, and publishes the Lift in percentage points. A 0-100 trust score combines security, quality, license, maintenance, and community signals, and Lift is always shown separately from ratings because money never touches scores. It also plans a free MCP server with per-agent loadouts, plus upstream change tracking with re-scans and notifications. Most directories simply list skills; SkillzBench is being built to prove which ones actually work and which are risky - important given research found ~26% of skills carry at least one vulnerability.

Is Claude for Excel free?

The add-in itself is installed through the Microsoft Marketplace/AppSource, but Claude for Excel requires a paid Claude plan - Pro, Max, Team, or Enterprise - according to Coursiv's 2026 guide. Organizations can also connect through an LLM gateway on Amazon Bedrock, Google Cloud Vertex AI, or Microsoft Azure/Foundry. It is supported on Excel on the web, Windows, Mac, and iPad, but not on Excel 2016/2019 perpetual installs or Excel on Android. If you want free spreadsheet AI assistance instead, reusable skills from community libraries and free skill directories are alternatives that work with free tiers of chat assistants.

Are free Claude skills safe to install?

Not automatically. Published research found roughly 26% of skills carry at least one vulnerability, and experienced developers warn about skills with self-reported metadata claiming capabilities their code can't deliver, and undocumented network calls baked into bundled scripts. Best practices from Firecrawl's 2026 guide include reading the full SKILL.md, auditing every bundled script before installing community skills, and treating the anthropics/skills repository and partner skills as safe defaults. Independent verification platforms like SkillzBench are being built to make this easier: security scans, license checks, and commit-SHA-pinned versions, so you know exactly what you're installing and can get notified if it changes upstream.

Can Claude skills work with Google Sheets as well as Excel?

Yes, in several ways. Reusable spreadsheet skills from AI Agents Library are explicitly designed to work with both Excel and Google Sheets, and GPT for Work offers native add-ins for both platforms. However, the built-in assistants are platform-specific: Claude for Excel and Microsoft Copilot work only in Excel, while Gemini in Sheets works only in Google Sheets. Agent skills themselves are instructions for the AI agent rather than spreadsheet-specific plugins, so a well-written skill for data cleaning, formula fixing, or dashboard building can typically guide an agent working with either file format.

How do I know if a spreadsheet skill actually improves Claude's performance?

Look for evidence rather than claims. Well-built skills have descriptions that read like routing rules, deterministic work in bundled scripts, lean SKILL.md files, and worked examples. But the only rigorous way to know is benchmarking: testing the same task with the same model, with and without the skill. That is exactly what SkillzBench is being built to do - running every skill in a sandbox against the same model and publishing the Lift in percentage points, separate from ratings. Until independent benchmarks are widely available, test skills on a copy of your own workbook with known defects, and always verify formulas, references, and results at the workbook level before trusting any AI-generated changes.

What's the difference between a Claude skill and a Claude add-in like Claude for Excel?

An add-in like Claude for Excel is a native sidebar that lives inside the Excel application and can directly read cells, edit, format, and build sheets with change tracking in your open workbook. A skill, by contrast, is a reusable instruction package (a SKILL.md folder) that teaches any compatible agent - Claude Code, Codex, Cursor, Gemini CLI, or a chat assistant - how to perform a specific procedure consistently, such as cleaning data, structuring a workbook, or diagnosing formulas. Add-ins are tied to one application and plan; skills are portable across agents and free to install. Many teams use both: the add-in for live in-workbook work, and skills for repeatable workflows that span files, tools, and sessions.