Skill comparison

Compare agent skills before installing.

Put high-signal skills side by side and inspect quality, adoption, freshness, install readiness, use-case fit, and warnings in one place.

Comparing 2 skills

Use this as a shortlist, then open the skill detail page before adopting.

Decision summary

Strongest overall

Apple Design

Use this as a leading candidate, then validate the README and install path in your own agent stack.

Fastest prototype

Apple Design

Best first install candidate based on install readiness and adoption.

Freshest repo

testing-principles

Most recent maintenance signal among this shortlist.

Signal	testing-principles Language-agnostic testing principles including TDD, test quality, coverage standards, and test design patterns. Use when writing tests, designing test strategies, or reviewing test quality.	Apple Design Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces.
Quality	75/100 Strong	100/100 Excellent
Decision verdict	86/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack.	100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack.
Adoption	675 stars Verified outcomes are shown on each skill page	34K stars Verified outcomes are shown on each skill page
Freshness	Aug 28, 2026	Aug 21, 2026
Use-case fit	Coding agents Testing and QA Design and creative	Design and creative