Product / UX designer

Heuristic UX review

Immediate result: Usability issues mapped to Nielsen's 10 heuristics and the laws of UX, rated by severity, with fixes.

Problem it solvesDesign reviews are opinion fights, and usability problems ship anyway.

Download SKILL.md
Add this skill to
ChatGPTClaudeGeminiPerplexity

You paste

Checkout: 14 form fields on one screen, coupon box above the pay button, error messages only after submit

You get

Coupon box above Pay — invites leaving to hunt for codes (goal-gradient interruption) — severity 3

Errors only after submit — error prevention heuristic — severity 3 → validate inline

14 fields — cognitive load — severity 2 → autofill address from PIN code

About this skill

About Heuristic UX review

Design reviews often become opinion fights while real usability problems ship anyway. This skill walks your screen or flow as a first-time user with a goal, then lists issues mapped to Nielsen's ten heuristics and the laws of UX, rated on Nielsen's zero-to-four severity scale with a concrete fix for each. It frames every finding as a hypothesis to test with real users, because an AI can't see your users. It's the same evidence-based lens Science of Apps applies in its behavioural UX audits. To use it, paste the skill into your assistant and send a description of the screen or flow (elements, copy, states) or a list of what happens step by step.

Heuristic UX review AI skill for Product / UX designer: you paste "Checkout: 14 form fields on one screen, coupon box above the pay button, error messages only after submit" and get "Coupon box above Pay — invites leaving to hunt for codes (goal-gradient interruption) — severity 3"
Heuristic UX review — example input and the first lines it returns. Works in ChatGPT, Claude and Gemini.
Job profile
Design & UX · Product / UX designer
Works in
ChatGPT, Claude, Gemini, Copilot, Claude Code
Format
Agent Skills (SKILL.md)
Price
Free, no sign-up
Install instructions

Copy, paste, send

  1. Cold email writerCopy skillCopied ✓1 Copy the skillPress Copy skill.
  2. ANY AI ASSISTANTSKILLPaste here, then press Enter2 Paste it into a new chatChatGPT, Claude, Gemini or Copilot.
  3. ANY AI ASSISTANT3 Send your inputSend a description of the screen or flow (elements.
The skill — paste this into your AI assistant
# Skill: Heuristic UX review

You are running the "Heuristic UX review" skill for me. I work as: Product / UX designer. What I need from you: usability issues mapped to Nielsen's 10 heuristics and the laws of UX, rated by severity, with fixes.

## When I send you a description of the screen or flow (elements, copy, states) or a list of what happens step by step
1. Walk the screen as a first-time user with a goal.
2. Find issues and map each to a heuristic or UX law.
3. Rate severity 0–4 (Nielsen's scale).
4. Suggest a concrete fix for each.

## Reply in this format
- User goal assumed
- Issues table: issue, heuristic / law, severity, fix
- Top three fixes
- What to test with real users

## Rules
- Name the principle behind every issue.
- Frame findings as hypotheses to test, not facts about users.
- Use only the facts I give you; mark anything you had to assume with [ASSUMPTION].
- If something essential is missing, ask me one short question, then continue.
- No preamble or filler: start with the result.

Confirm you're ready in one line, then wait for me to send a description of the screen or flow (elements, copy, states) or a list of what happens step by step.

Then sendA description of the screen or flow (elements, copy, states) or a list of what happens step by step. For example: Checkout: 14 form fields on one screen, coupon box above the pay button, error messages only after submit

ChatGPT

  1. Fastest: paste the skill as your first message in a new chat, then send your input.
  2. To keep it: open a Project, choose Instructions (or Settings → Personalization → Custom instructions for every chat) and paste it there.
  3. To share it with a team: create a custom GPT and paste the skill into its Instructions.
  4. In the Codex app: copy the skill's folder into ~/.codex/skills/ (or Customize → Skills → Add → Create skill).

Claude

  1. Fastest: paste the skill as your first message in a new chat, then send your input.
  2. To keep it: create a Project, open Project instructions and paste the skill.
  3. As a Claude Skill: download the skill's ZIP, then in Claude open Settings → Skills → Add → Upload skill and choose the file.

Gemini

  1. Fastest: paste the skill as your first message in a new chat, then send your input.
  2. To keep it: open Gems → New Gem, paste the skill into Instructions and save.

Microsoft Copilot

  1. Fastest: paste the skill as your first message, then send your input.
  2. In Microsoft 365 Copilot, save it as a prompt or paste it into an agent's instructions to reuse it.

Any other assistant

  1. Paste the skill as the system prompt or first message in any chat assistant (Perplexity, Meta AI, DeepSeek, Mistral, local models).
  2. Coding agents that read the Agent Skills format (SKILL.md) can load the downloaded file from their skills folder.

Install it permanently

Upload it to Claude, add it to ChatGPT's Codex app, clone it into Claude Code, or download the SKILL.md for any agent. Full guide with screenshots →

Download the ZIP and upload it in Claude. Claude then uses the skill on its own whenever a request matches.

Download ZIP

Quick setup

  1. In Claude, open Settings → Skills (under Customize).
  2. Click Add → Upload skill.
  3. Choose the ZIP — don't unzip it — and make sure the skill is switched on.
Claude Settings with Skills selected under Customize, and the Add menu open showing Upload skill, Create a skill, Create with Claude and Record your screen

Repositoryscienceofapps.com/skills/ai-skills.git · all 200 skills, one folder each, plain git over HTTPS

What it does

The steps it follows

  1. Walk the screen as a first-time user with a goal.
  2. Find issues and map each to a heuristic or UX law.
  3. Rate severity 0–4 (Nielsen's scale).
  4. Suggest a concrete fix for each.
What you get back

The reply format

  • User goal assumed
  • Issues table: issue, heuristic / law, severity, fix
  • Top three fixes
  • What to test with real users

Rules it never breaks

  • Name the principle behind every issue.
  • Frame findings as hypotheses to test, not facts about users.
  • Uses only the facts you give it and marks assumptions.
FAQs

Questions about Heuristic UX review

What does the Heuristic UX review skill do?

Design reviews are opinion fights, and usability problems ship anyway. The skill fixes that: usability issues mapped to Nielsen's 10 heuristics and the laws of UX, rated by severity, with fixes.

How do I install Heuristic UX review in ChatGPT, Claude or Gemini?

Copy the skill and paste it as the first message of a new chat, then send your input. To keep it, paste it into a ChatGPT Project or custom GPT, a Claude Project or a Gemini Gem, or upload the SKILL.md file as a Claude Skill.

What do I send Heuristic UX review after installing it?

Send a description of the screen or flow (elements, copy, states) or a list of what happens step by step. If something essential is missing, the skill asks you one short question and then continues.

Is the Heuristic UX review skill free?

Yes. It's free to copy, use and adapt, with no sign-up, and works in the free versions of ChatGPT, Claude, Gemini and Copilot.

More for design & ux
UX writer / designer

Microcopy writer

ProblemButtons, empty states and error messages are written last, and they confuse users.

You paste

UPI payment screen: enter UPI ID, pay button, states: invalid ID, pending, failed, success

You get

Button: 'Pay ₹499' (not 'Submit')

Invalid ID: 'That UPI ID doesn't look right — it should look like name@bank'

Pending: 'Approve the request in your UPI app. This page updates on its own.'

Immediate resultClear microcopy for every state of your component: labels, helper text, errors, empty and success states.

How to use it
Designer / front-end developer

Accessibility checker

ProblemAccessibility issues are found late, by users who can't use the product.

You paste

<div onclick='buy()'>Buy</div> · grey #999 text on white · icon-only close button

You get

div as button — 2.1.1 Keyboard (A) → use <button type='button'>

#999 on #fff = 2.85:1 — fails 1.4.3 (AA, needs 4.5:1) → use #595959 (7:1)

Icon-only close — 4.1.2 Name, Role, Value → add aria-label='Close'

Immediate resultWCAG 2.2 issues found in your HTML or design description, with the success criterion and fix for each.

How to use it
UX researcher / designer

Usability test script

ProblemUsability tests ask leading questions and test the wrong tasks.

You paste

Prototype of a medicine-reminder app for people over 60

You get

Task: 'Your doctor just added a tablet to take after dinner. Set it up so you won't forget.'

Not: 'Tap Add Medicine.'

Probe: 'What did you expect to happen there?'

Immediate resultA moderated test script with screener, warm-up, realistic tasks, neutral probes and a debrief.

How to use it

All 12 design & ux skillsAll 200 skillsRead it in the articleProve it: AI for UX/UI Designers Certification (free test)

Free PDF · 74 pages · 2 editions

The Laws of UX, in one field guide

60 research-backed principles in 6 categories — what each one means, why it works on the human brain and how to use it on your own screens. Written by Sushant Singh, founder of Science of Apps, who has scaled consumer apps to lacs of users and spent 10+ years leading product across startups and digital businesses in the US, EU & India.

Pick your edition
Free. No card, no paywall — just your email.
Free PDF · 74 pages

Get Laws of UX by email

Choose your edition

You’ll also get occasional UX psychology tips. Unsubscribe anytime. Privacy policy

Free PDF · 90 pages · 2 editions

100+ Subscription Paywalls, decoded

110 real paywalls from top apps, taken apart, rated out of 5 and decoded with the Laws of UX — plus the frameworks, copy and checklists to ship your own. By Sushant Singh, founder of Science of Apps.

  • 110 paywalls rated
  • 34 Laws of UX
  • 12 frameworks

Which paywall scored 4.8 out of 5, and which scored 2.6? It’s all inside.

Pick your edition
Free. No card, no paywall — just your email.
Free PDF · 90 pages

Get 100+ Paywalls, Decoded by email

Choose your edition

You’ll also get occasional UX psychology tips. Unsubscribe anytime. Privacy policy