29 Must-Have Claude Skills

Out of the box, Claude is a generalist. Skills turn it into a specialist. A skill is a free instruction pack that teaches Claude one job really well, like designing a website, writing without AI tells or running an SEO audit, and once it's installed Claude uses it automatically when that job comes up. Here are 29 free, open-source skills worth installing, grouped by what you do, with the exact install line or link for every one.

What Skills Actually Do

Think of skills like apps on your phone. Your phone is useful out of the box, but the right apps make it way more powerful. Install a marketing skill and Claude becomes a marketing strategist. Install a design skill and it becomes a UI/UX pro. Install a video skill and it builds whole videos from one prompt.

Every skill here is free and open source. Two of them (Arcads and the Picsart CLI) connect to paid accounts, and they say so.

How to Install Any Skill

There are three ways to install a skill. Pick whichever fits the skill and your setup.

Option 1: Paste the link (fastest)

Open Claude Code, or the Code tab in the Claude desktop app, paste the skill's GitHub link and say:

Install this skill: [GITHUB LINK]

Claude reads the repo, pulls the skill files and installs them for you. The bigger ones (Marketing Skills, Superpowers, Arcads and the Picsart CLI) are built for Claude Code, so this is the way to go for those.

Option 2: Paste the install lines (Claude Code)

Some skills below come with exact install lines. Open your terminal, type claude to start Claude Code, then paste the lines one at a time. When it asks where to install, pick Install for you so the skill works in every project. New to Claude Code? Start with my Claude Code setup guide.

Option 3: Upload it in the Claude app (web or desktop)

• Turn on Settings > Capabilities > Code execution and file creation if it's off.
• On the skill's GitHub page, download the skill folder as a ZIP.
• Go to Customize > Skills, click +, choose Create skill, then Upload a skill, and pick the ZIP.

Skills you upload are private to your account, and Claude decides when to use each one based on what you ask.

Bonus: Find Skills (by Fockus)

The skill that finds you more skills. Tell Claude what you're building and it searches thousands of skills across more than a dozen sources, picks the right ones and installs them. If you don't know where to start, start here.

Get it: github.com/fockus/claude-skill-find-skill

Writing and Marketing Skills

Blader Humanizer

The go-to skill for removing every trace of AI writing from your text. Built on Wikipedia's "Signs of AI writing" guide, it checks for 26 AI writing patterns, like inflated significance, sales language, dash overuse, forced groups of three and overused AI words, and rewrites your text to sound completely human. It has 60,000+ GitHub stars.

Best for: Creators, bloggers and marketers publishing anything AI-assisted under their own name.

/plugin marketplace add blader/humanizer
/plugin install humanizer@humanizer

Using the Claude app instead? Download the repo as a ZIP and upload it under Customize > Skills. GitHub: github.com/blader/humanizer

Stop-Slop (by Hardik Pandya)

Forces Claude to strip out every AI giveaway while it writes: throat-clearing openers ("In today's world..."), emphasis crutches, filter phrases, binary contrasts, rule-of-three lists and AI words like "delve" and "tapestry."

Try it: Pair it with the Humanizer for two layers. Stop-Slop catches patterns while Claude writes, and the humanizer cleans up after. My humanizer guide has the prompts.

Get it: github.com/hardikpandya/stop-slop

Marketing Skills (by Corey Haines)

50+ free marketing skills for CRO, copywriting, SEO audits, ads, email sequences, pricing, analytics and growth. Each one reads your product context first, so every output fits your brand, audience and positioning. It's like hiring a whole marketing team that works inside Claude.

Try it: Run the SEO audit on your homepage first. You get a prioritized fix list that agencies often charge $2,000+ for.

/plugin marketplace add coreyhaines31/marketingskills
/plugin install marketing-skills

Want these in the Claude app, step by step, plus the best ways to use them? Here's my full marketing skills guide. GitHub: github.com/coreyhaines31/marketingskills

Claude SEO

A full SEO toolkit with 26 sub-skills and 19 specialist agents, up to 17 working in parallel on one audit. It covers technical SEO, E-E-A-T, schema, local and international SEO, AI search optimization (getting cited by ChatGPT and Perplexity), Google Search Console, PageSpeed and GA4, and it exports PDF reports.

Best for: Website owners, marketers and agencies who want to rank and get cited by AI.

/plugin marketplace add AgriciDaniel/claude-seo
/plugin install claude-seo@agricidaniel-claude-seo
/seo setup

GitHub: github.com/AgriciDaniel/claude-seo

SEO Machine (by Craig Hewitt)

A workspace for long-form blog posts built to rank. Describe your topic and keywords and Claude handles the research, writing and optimization, with keyword clustering, content gap analysis, internal link ideas and meta titles.

Try it: Feed it your top 3 competitors' blogs first. The gap analysis shows which topics they rank for that you don't cover yet.

Get it: github.com/TheCraigHewitt/seomachine

AI Sales Team (by Zubair Trabzada)

A sales team for Claude Code with 14 skills and 5 parallel agents. It researches prospects, qualifies leads with BANT and MEDDIC, finds decision makers, writes personalized email and LinkedIn outreach, preps your meetings, drafts proposals and builds PDF pipeline reports.

Try it: Feed it a company URL and let it build a full brief before you reach out. That context makes the outreach way more personal.

Get it: github.com/zubair-trabzada/ai-sales-team-claude

Entrepreneur Skills (by Matt Warren)

24 skills covering marketing, sales, operations, finance and leadership, built by a founder for founders. Each one turns a real task into a process Claude can finish end to end: business plans, financial projections, pitch decks, cold outreach, hiring scorecards and SOPs.

Try it: Fundraising? Start with the financial projection skill. It builds models from your actual numbers.

Get it: github.com/mfwarren/entrepreneur-claude-skills

Design, Video and Image Skills

UI/UX Pro Max (by Next Level Builder)

The most complete design skill out there. It gives Claude a searchable design database with 79 UI styles, 192 color palettes, 74 font pairings, 119 UX guidelines and 25 chart types across 22 tech stacks (React, Next.js, Vue, Svelte, Flutter, SwiftUI, React Native, Tailwind, shadcn/ui and more). Say "fintech dashboard" and its Design System Generator picks the style, colors and fonts for you.

Try it: Start every project by telling Claude the industry, let it build the design system, then point to that system in every prompt after.

/plugin marketplace add nextlevelbuilder/ui-ux-pro-max-skill
/plugin install ui-ux-pro-max@ui-ux-pro-max-skill

GitHub: github.com/nextlevelbuilder/ui-ux-pro-max-skill

Frontend Design (official, by Anthropic)

Anthropic's own design skill. Before it writes any code, it grounds the design in your subject and audience and commits to a deliberate palette, typography and layout, so you skip the cookie-cutter "AI look" of rounded cards, default fonts and gradient washes.

Best for: Websites and interfaces that don't look AI-generated.

/plugin install frontend-design@claude-plugins-official

On a paid Claude plan you can also switch it on in the Claude app under Customize > Skills. GitHub: github.com/anthropics/claude-code/tree/main/plugins/frontend-design

Remotion Video (official, by Remotion)

Lets Claude build fully animated videos from a text prompt: product demos, social clips, explainers and motion graphics. It uses React under the hood, with the Remotion team's own rules for animation, audio, captions, charts and transitions, and exports MP4s.

Try it: Start small with a 10-second logo reveal or a text-based social clip, then scale up. More in my video editing guide.

Get it: github.com/remotion-dev/skills

Picsart GenAI CLI (by Picsart)

Gives Claude 140+ AI models for images (Flux, Recraft, Nano Banana, GPT Image), video (Veo, Kling, Runway, Seedance) and audio (ElevenLabs), plus editing tools like background removal and upscaling. You pay with credits from your Picsart account, and you can check any model's price before you generate.

Try it: It's also the base the other Picsart skills build on, like Headshot Studio. Full setup in my images and videos with Claude guide.

Get it: picsart.com/gen-ai-cli/

Arcads (by Kruse Media LLC)

Makes AI marketing videos and images through your Arcads account, powered by agents in Claude Code. It works with top video and image models like Seedance, Veo, Kling, Grok Video and Nano Banana, with skills for UGC video ads, YouTube thumbnails and AI influencer content. Needs a paid Arcads account.

Try it: Start with one UGC ad for your best-selling product. Upload a product photo as a style reference, give Claude the hook and the offer, then batch out variations once one works.

Get it: github.com/krusemediallc/arcads-claude-code

Frontend Slides (by Rui Zhang)

Builds animation-rich presentations as web pages, from a topic or outline, or by converting your existing PowerPoint files. You get a standalone HTML file you can host anywhere.

Try it: Give Claude a detailed outline with your key points and let it design the whole deck.

Get it: github.com/zarazhangrui/frontend-slides

Algorithmic Art (official, by Anthropic)

Creates generative art with p5.js: flow fields, particles, fractals and geometric patterns. Change the random seed and you get endless unique variations, exported as PNG, SVG or an interactive web page.

Try it: Ask for a piece in your brand colors with a mood ("organic and flowing"), then ask for 5 variations with different seeds.

Get it: github.com/anthropics/skills

Research and Data Skills

Scientific Agent Skills (by K-Dense)

Formerly Claude Scientific Skills. 177 research skills covering biology, chemistry, medicine, physics, engineering, Earth science and data analysis, plus guides to 100+ scientific and financial databases. It turns Claude into a research assistant that runs statistical tests, makes publication-quality charts, writes literature reviews and builds reports.

Best for: Researchers, students, analysts and anyone who works with data.

npx skills add K-Dense-AI/scientific-agent-skills

Run this one in your normal terminal, not inside Claude Code, and pick Claude Code when it asks where to install. GitHub: github.com/K-Dense-AI/scientific-agent-skills

D3.js Visualization (by Chris von Csefalvay)

Teaches Claude to make interactive charts with D3.js: line charts, bar charts, scatter plots and more, sharp at any size with custom colors, ready to embed in a website, deck or report.

Try it: Upload a CSV and say "visualize the trends with an interactive D3 chart." You get HTML you can drop into any website.

Get it: github.com/chrisvoncsefalvay/claude-d3js-skill

Obsidian Second Brain (by Eugeniu Ghelbur)

Turns your Obsidian vault into an AI-powered second brain with 31 commands. Claude runs your vault without you opening Obsidian, pulls web research into your notes, runs scheduled agents that update the vault while you sleep, and connects ideas across years of notes.

Try it: Set up a daily agent that scans news in your industry and adds summaries to your vault. Over time you get a knowledge base you can ask anything.

Get it: github.com/eugeniughelbur/obsidian-second-brain

Coding and Security Skills

These are for building software in Claude Code.

Superpowers (by Jesse Vincent)

The biggest community-built skill library in the Claude ecosystem, with 300,000+ GitHub stars. It runs the whole software process for you: brainstorming questions, planning, small tasks handed to fresh subagents with two-stage review, test-driven development and code review before merging.

Try it: Let it run the full workflow and don't skip the brainstorming or planning. It feels slower at first, but the code comes out much better.

Get it: github.com/obra/superpowers

TDD Guard

Enforces a strict Red-Green-Refactor cycle every time. When Claude tries to skip tests or over-build, TDD Guard blocks it and explains what needs to happen instead. Works with Vitest, Jest, pytest, PHPUnit, Go, Rust, RSpec and more.

/plugin marketplace add nizos/tdd-guard
/plugin install tdd-guard@tdd-guard
/tdd-guard:setup

Needs Node.js 22 or newer. Starting a brand-new project? The same developer also makes Probity, a newer version that also works with Codex and GitHub Copilot CLI. GitHub: github.com/nizos/tdd-guard

Playwright Skill (by Justin Lackey)

Lets Claude write and run browser tests on its own. It opens a real browser, clicks through your app, fills forms, takes screenshots and checks that everything works.

Try it: After building a feature, just say "test the checkout flow." It writes the test, runs it and tells you what broke.

Get it: github.com/lackeyjb/playwright-skill

OWASP Security

Gives Claude deep knowledge of the OWASP Top 10:2025, ASVS 5.0, the OWASP Top 10 for LLM apps and agentic AI security, plus security quirks for 20+ languages. Every time Claude writes or reviews code, it catches vulnerabilities before they ship. Install it globally to protect every project.

/plugin marketplace add agamm/claude-code-owasp
/plugin install owasp-security@agamm

GitHub: github.com/agamm/claude-code-owasp

Trail of Bits Security (by Trail of Bits)

Security expertise from one of the most respected security firms in the world: static analysis, variant analysis to find similar bugs across your code, and security-focused code review with fixes.

Try it: Run it on your login and payment code first. Those are the highest-risk areas.

Get it: github.com/trailofbits/skills

iOS Simulator Skill (by Conor Luddy)

Lets Claude build, run and tap through iOS apps in the simulator and take screenshots, so it can see the code it wrote actually running.

Try it: After Claude writes a new screen, ask it to build and screenshot it. Layout bugs show up right away.

Get it: github.com/conorluddy/ios-simulator-skill

React Native Agent Skills (official, by Callstack)

The official React Native skills from Callstack, core contributors to React Native: native iOS and Android integration, bundling, app size and performance tuning.

Try it: Combine it with UI/UX Pro Max. One handles the design system, the other handles the React Native details.

Get it: github.com/callstackincubator/agent-skills

Memory and Productivity Skills

Claude Mem (by Alex Newman)

Claude Code forgets everything when a session ends. Claude Mem captures what happens while you work, compresses it and feeds the relevant context back in next time, so you stop re-explaining your project and preferences. It's free on your own plan, with an optional paid hosted memory.

/plugin marketplace add thedotmack/claude-mem
/plugin install claude-mem

Restart Claude Code after installing. Context from your earlier sessions shows up automatically. GitHub: github.com/thedotmack/claude-mem

Context Engineering Kit (by NeoLab HQ)

The longer a task runs, the easier it is for Claude to drift. This kit is a set of small, token-light plugins that keep it sharp: Reflexion reviews and improves its own answers, Spec-Driven Development plans before it builds, and Subagent-Driven Development splits big jobs across helper agents.

/plugin marketplace add NeoLabHQ/context-engineering-kit
/plugin install reflexion@NeoLabHQ/context-engineering-kit

Start with Reflexion, then add others from the same marketplace by swapping in their names. GitHub: github.com/NeoLabHQ/context-engineering-kit

Caveman Mode (by Julius Brussee)

Makes Claude answer in ultra-compressed language, cutting a big chunk of output tokens while keeping the technical accuracy (its own example takes a 63-token answer down to 20). Pair it with the Context Engineering Kit to save even more.

Get it: github.com/juliusbrussee/caveman

Task Observer (by Eoghan Henn / Rebelytics)

Makes all your other skills better. It notices your corrections and the jobs you keep doing by hand, then suggests updates or new skills to build. You decide which changes go in.

Get it: github.com/rebelytics/one-skill-to-rule-them-all

Common Mistakes and Quick Fixes

Quick Reference: All 29 Skills

DO THIS TODAY

Install the one skill that fits what you do most and use it on a real task today.

Published March 31, 2026 · Checked October 2026