Best marketplaces for Validate (2026)
diagram-design is the best marketplace for the Validate phase - 31.7k GitHub stars. Strong alternatives: pixelrag-plugins and spec-workflow-mcp-marketplace.
174 marketplaces for developers in marketplaces, ranked by GitHub stars. Every pick links to install commands and trust signals.
Ranked by Skillselion · adoption from the skills.sh registry & GitHub · data refreshed October 25, 2026.
The top 10 marketplaces for validate
| # | Marketplace | Stars |
|---|---|---|
| 1 | diagram-designCathryn Lavery · cathrynlavery/diagram-designTop pick diagram-design helps Claude Code produce structured diagrams for validating product concepts, mapping user flows, and prototyping system architecture before implementation begins. | 31.7k |
| 2 | pixelrag-pluginscollectionStarTrail-org · StarTrail-org/PixelRAG PixelRAG plugins is a one-plugin Claude marketplace from StarTrail-org built around pixelbrowse, which captures arbitrary URLs with pixelshot so Claude can reason over what users actually see—not just HTML text dumps. | 9.9k |
| 3 | spec-workflow-mcp-marketplacecollectionPimzino · Pimzino/spec-workflow-mcp This marketplace distributes the spec-workflow-mcp plugins (a base variant and a with-dashboard variant) for structured, spec-driven development in Claude Code. | 4.3k |
| 4 | goland-claude-marketplacecollectionJetBrains, GoLand Team · JetBrains/go-modern-guidelines official JetBrains project http jb gg badges official svg https confluence jetbrains com display ALL JetBrains on GitHub Modern Go Guidelines This repository contains guidelines https github com JetBrains go-modern-guidelines blob main claude modern-go-guidelines skills use-modern-go SKILL md for code agents that help them write modern Go code For example an agent with these guidelines uses max a b instead of an if-else block slices Contains instead of a manual loop cmp Or a b c instead of a chain of nil checks It also knows about recent additions like new 42 to get a pointer to a value and errors AsType T err for type-safe error matching both from Go 1 26 The guidelines cover the most useful features from Go 1 0 through Go 1 26 including everything targeted by the modernize analyzer An agent will Detect the project's Go version from go mod Use language features and stdlib additions available up to and including that version Prefer modern idioms over older patterns Motivation All coding agents tend | 3.2k |
| 5 | startup-skillFerdinando Bons · ferdinandobons/startup-skill startup-skill (v1.10.0, 513 GitHub stars) is a Claude Code plugin packaging four skills: startup-design, startup-competitors, startup-positioning, and startup-pitch. | 889 |
| 6 | lawvablecollectionAntoine Louis (Lawvable) · lawve-ai/awesome-legal-skills Lawvable is a large Claude Code plugin marketplace from Lawvable (Antoine Louis) that bundles forty-two legal skills contributed by practitioners such as Jamie Tso and Patrick Munro. | 679 |
| 7 | playhtmlSpencer Chang · spencerc99/playhtml playhtml from spencerc99/playhtml offers one Claude Code plugin for interactive HTML prototyping, letting teams validate layout, copy, and basic UX in the browser before investing in full frontend architecture. | 487 |
| 8 | bmad-method-harnesscollectionAJ Geddes · aj-geddes/claude-code-bmad-skills BMAD Method Harness is a community marketplace hosting the BMAD Planning & Orchestrator, a Claude Code harness focused on planning, roadmapping, and conflict-free parallel orchestration. | 485 |
| 9 | taiwan-payment-skillscollectionpaid-tw · paid-tw/skills Development tool. | 276 |
| 10 | solo-founder-superpowers-marketplacecollectionWill Hawkins · whawkinsiv/solo-founder-skills solo-founder-superpowers-marketplace is Will Hawkins’s Claude Code marketplace that ships one plugin bundling forty-three skills tuned for non-technical founders building SaaS with AI assistants. | 242 |
Why these marketplaces rank for validate
1. diagram-design
diagram-design ranks #1 of the 174 marketplaces for Validate by adoption, with 31.7k GitHub stars. It diagram-design helps Claude Code produce structured diagrams for validating product concepts, mapping user flows, and prototyping system architecture before implementation begins.
2. pixelrag-plugins
pixelrag-plugins ranks #2 of the 174 marketplaces for Validate by adoption, with 9.9k GitHub stars. It pixelRAG plugins is a one-plugin Claude marketplace from StarTrail-org built around pixelbrowse, which captures arbitrary URLs with pixelshot so Claude can reason over what users actually see—not just HTML text dumps.
3. spec-workflow-mcp-marketplace
spec-workflow-mcp-marketplace ranks #3 of the 174 marketplaces for Validate by adoption, with 4.3k GitHub stars. It this marketplace distributes the spec-workflow-mcp plugins (a base variant and a with-dashboard variant) for structured, spec-driven development in Claude Code.
4. goland-claude-marketplace
goland-claude-marketplace ranks #4 of the 174 marketplaces for Validate by adoption, with 3.2k GitHub stars. It official JetBrains project http jb gg badges official svg https confluence jetbrains com display ALL JetBrains on GitHub Modern Go Guidelines This repository contains guidelines https github com JetBrains go-modern-guidelines blob main claude modern-go-guidelines skills use-modern-go SKILL md for code agents that help them write modern Go code For example an agent with these guidelines uses max a b instead of an if-else block slices Contains instead of a manual loop cmp Or a b c instead of a chain of nil checks It also knows about recent additions like new 42 to get a pointer to a value and errors AsType T err for type-safe error matching both from Go 1 26 The guidelines cover the most useful features from Go 1 0 through Go 1 26 including everything targeted by the modernize analyzer An agent will Detect the project's Go version from go mod Use language features and stdlib additions available up to and including that version Prefer modern idioms over older patterns Motivation All coding agents tend.
5. startup-skill
startup-skill ranks #5 of the 174 marketplaces for Validate by adoption, with 889 GitHub stars. It startup-skill (v1.10.0, 513 GitHub stars) is a Claude Code plugin packaging four skills: startup-design, startup-competitors, startup-positioning, and startup-pitch.
Common questions
What is the best marketplace for the Validate phase?
diagram-design is the top-ranked marketplace for Validate, with 31.7k GitHub stars - diagram-design helps Claude Code produce structured diagrams for validating product concepts, mapping user flows, and prototyping system architecture before implementation begins..
What are the best alternatives to diagram-design for validate?
Strong alternatives ranked just behind diagram-design are pixelrag-plugins and spec-workflow-mcp-marketplace. All 174 options are compared in the table above, ranked by real adoption.
How do I install diagram-design?
Run: /plugin marketplace add cathrynlavery/diagram-design
How are these marketplaces ranked?
By GitHub stars across the 174 marketplaces tagged to the Validate phase - none of these marketplaces report installs yet. Data from GitHub.
More in marketplaces
Browse all marketplaces in the catalog, or see every best-of shortlist.