PromptPerfect generates and refines prompts for models such as GPT-4, ChatGPT, and Midjourney.
Myriad
Myriad helps create prompts for ChatGPT, Copilot, and other AI tools for posts, ads, social content, and emails.
About Myriad
Myriad is a free web tool for building prompts for AI tools such as ChatGPT, Copilot, Gemini, Claude, and Llama. Users combine writing rules, such as writing style, tone, target audience, and SEO keywords, to create prompts for posts, ads, social content, emails, scripts, and webpages. The tool supports three tasks: writing new content, rewriting existing content, and analyzing competitor content to produce a writing blueprint.
The homepage describes a verification prompt that asks the AI to explain how its output meets each rule and to report any rule conflicts. Users can also create custom rules and test them with this verification prompt. The homepage notes that AIs sometimes skip a rule when it conflicts with another rule, and that long, multi-sentence rule instructions can confuse the AI. The examples shown were generated with ChatGPT 4 without prior chat history.
Key features
- Prompt builder combining 35+ rules and 150+ instructions for content tasks
- Write, Rewrite, and Analyze modes for content creation and revision
- Custom rules that can be tested with the verification prompt
- Follow-up prompt that checks whether the AI followed the requested rules
- Priority marking by adding an exclamation mark to a rule label
- Works with ChatGPT, Gemini, Copilot, Claude, and Llama
Best for: Marketers, content writers, and social media or email teams who want reusable, structured prompts for AI writing tools.
Good for
- Free to use, as stated on the homepage
- Rules and instructions can be mixed, and custom rules can be added
- Includes a verification prompt for checking whether the AI followed each rule
Watch out for
- AIs may skip a rule when it conflicts with another rule
- Long, multi-sentence rule instructions can confuse the AI, according to the homepage tips
- AIs may state details literally, such as an income range, instead of using them implicitly
Myriad at a glance
- Category
- AI & Machine Learning › AI Writing Tools
- Type
- Online tool
- Pricing
- Free
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
Myriad alternatives
Tools and sites you could use instead, ranked by how closely they match.
Textbuddy combines AI writing tools for drafting, rewriting, proofreading, social posts, and email replies.
OpenPrompt provides a place to create, use, and share prompts for ChatGPT.
Open source
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Myriad FAQ
Can Myriad be used with AI tools other than ChatGPT?
The homepage states that Myriad also works with Gemini, Copilot, Claude, and Llama, although the rules were tested and optimized for ChatGPT.
What can I do if the AI skips a rule?
The homepage suggests using the follow-up prompt to check for issues, changing the instructions, or adding "!" to the end of a rule label to give it priority.
Do I need to use every rule?
No. The homepage says you can use as many or as few rules as you want.
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