Free Custom GPT directory
Custom GPTs for Product Development
Interview customers without leading them, write sharper requirements and prioritise what to build next. Here are the 5 public Custom GPTs we would open first, what each one is good at, and the exact task to try.
- Free for everyone
- Opens in ChatGPT, also on the free plan
- Links checked 5 October 2026
Go further than a Custom GPT
Make your own AI the expert, not someone else’s GPT
A Custom GPT is someone else's assistant, in ChatGPT only. Skills and AI plugins work inside the AI you already use, with your own files and your own way of working.
AI skills for product development
Ready-made expert instructions for one task each. Add them to ChatGPT, Claude, Microsoft Copilot or Grok and your AI does that task the way a specialist would.
- 360 feedback system
- Access matrix
- Accounting audit system builder
- Accounting software selection
One AI plugin with everything for your job
Every skill, prompt and app for one job in a single download. It installs as your own Custom GPT in ChatGPT, a Claude project, a Copilot agent and more.
- Product Analyst
- UX Researcher
- Mechanical Engineer
- Automotive Engineer
Also for product development: ready-to-use prompts · AI courses · MCP servers · all skills · all AI plugins
The directory
The 5 best free Custom GPTs for product development
Each one opens on chatgpt.com in a new tab. Start with the suggested first task: it shows in a minute whether the GPT fits your work.
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PRD GPT
Creates consistently structured product requirements documents through guided questions.
Try this firstStart with a feature idea and build a PRD covering users, requirements, scope, and open questions.
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Product Manager Pro (PRD & Product Briefs)
Uses product-brief, PRD, and press-release templates.
Try this firstDefine an MVP, draft user stories, or develop a roadmap through a structured question-and-answer process.
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ProdGPT
Educational resource and daily assistant for product managers.
Try this firstReview a product case study, improve a PRD, or learn how to approach a product-management problem.
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The Mom Test User Research Assistant
Helps create customer-interview scripts, identify audiences, and interpret interview notes.
Try this firstImprove a discovery interview to reduce leading questions and extract themes from customer notes.
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PRDMaster: Assistant for Product Managers
Assistant for drafting, reviewing, and improving product requirements documents.
Try this firstReview a draft PRD for unclear requirements, missing edge cases, acceptance criteria, and open decisions.
Getting good results
Four habits that make any Custom GPT better
- Be specific. Say the task, who it is for, your limits and the format you want back.
- Give it your material. Paste the approved source: a policy, brief, requirements or anonymised notes.
- Ask what is fact and what is guess. Let it separate what you gave it from its assumptions and gaps.
- Check before you use it. Verify sources, numbers and any claim that matters.
A starting prompt for any GPT
Help me complete [task] for [audience]. Use the source material below and follow these constraints: [constraints]. Produce [output format]. Ask about missing information that would materially change the result. Distinguish facts from assumptions and flag anything that needs verification.
Replace the parts in [brackets]. More like this in the prompts for product development.
Which one should you use?
Custom GPT, skill or AI plugin
Skill
One task, done like an expert
- Works in your own AI
- ChatGPT, Claude, Copilot, Grok
- Pick only what you need
AI plugin
Your whole job, in one install
- All skills, prompts and apps for your job
- 8 AIs, incl. your own Custom GPT
- Included in membership
Questions
Good to know
Are these Custom GPTs free?
Yes. They are public GPTs in OpenAI's GPT Store. Anyone with a ChatGPT account can open them, including on the free plan; free accounts have lower daily limits than paid ones. Complete AI Training does not charge for this list.
How do I open a Custom GPT?
Click "Open in ChatGPT". The GPT opens on chatgpt.com (sign in if asked) and you type your request in the chat box, just like in normal ChatGPT. To keep it handy, click its name at the top and choose "Keep in sidebar".
How were these GPTs for product development chosen?
We picked them for how well they fit everyday product development tasks, based on their public descriptions, and checked that every link worked on 5 October 2026. It is a curated shortlist, not a lab test: creators can change or remove a GPT at any time.
Is my data safe in a Custom GPT?
A Custom GPT is made by another person or company, and some send your messages to outside services. Do not paste confidential, customer or patient information into one unless your organisation has approved it. Use anonymised examples instead.
What is the difference between a Custom GPT, a skill and an AI plugin?
A Custom GPT is someone else's ready-made assistant inside ChatGPT. A skill is a set of expert instructions you add to your own AI (ChatGPT, Claude, Copilot or Grok) for one task. Our AI plugin for your job bundles the skills, prompts and apps for that job into one assistant you install yourself, so it works the way you work.
GPT names and descriptions come from their public listings on chatgpt.com. Complete AI Training is not affiliated with OpenAI or with the creators of these GPTs. OpenAI is moving business (Enterprise) Custom GPTs to plugins; see OpenAI's guidance.
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