Proof · Office #49,486

What it is

Calls itself “product design skill”.

• Calls itself: product design skill

“…proof — a product design skill for Claude Code and Codex”

Where it puts itself

Claims “The first draft looks shipped”.

• Superlative claim: The first draft looks shipped

“The first draft looks shipped; you adjust it in minutes.”

What it costs

A free tier, free forever. No monthly or yearly plan. No one-time option.

• One-time: no
• Monthly: no
• Yearly: no
• Free plan: free forever

“Proof 免费开源。如果它帮到了你，可以用支付宝或微信打赏一点，让我能持续地做下去。谢谢你！”

“Proof 免费开源。”

Who it sells to

Sells to developers.

• Sells to: developers

How it runs

A command-line tool. Runs locally and works offline. Distributed through the npm. Open source. AI is the core of the product.

• Kind: cli
• Runs where: on the device, offline
• Distributed via: npm
• Open source: yes
• AI role: core to the product

“…npx skills add senlindesign/proof”

“…cp -R proof/skills/proof ~/.claude/skills/”

What it works with

Names Claude Code, Codex and 1 more on its pages.

• Names: Claude Code · Codex · Mobbin

“…proof — a product design skill for Claude Code and Codex”

“Every pattern comes from 400+ real product pages, studied through Mobbin .”

What it offers as proof

Live, no waitlist. Claims “400+”. Try it without signing up.

• Number claimed: 400+
• Trial asks for: nothing

“Proof 免费开源。”

“Free, open source, and ready in your agent in under a minute.”