Write naturally
Start with the quick prompt you would normally type into ChatGPT, Claude, Gemini, or another supported chatbot.
Free AI prompt generator + optimizer
The AI prompt generator that builds prompts you'll actually reuse.
SecondBrain is a free AI prompt generator and prompt optimizer. Turn rough ideas into structured prompts, fix weak prompts in one click, and save the ones that work across ChatGPT, Claude, Gemini, and every major AI chatbot.
ChatGPT
Claude
Gemini
Grok
Meta AI
DeepSeek
Perplexity
Copilot
Rough prompt
Write a launch email. Make it professional.Optimized prompt
Write a 180-word product launch email for existing customers. Use a confident tone, include three benefits, and end with one CTA.
Optimize prompt
Save prompt
Open library
One-click rewrite
Optimize drafts without leaving the chatbot.
Reusable library
Save working prompts locally for repeat tasks.
Cross-platform workflow
Use one prompt system across major AI tools.
How the prompt generator works
From rough idea to reusable AI prompt in three steps.
The prompt generator asks for the missing variables — goal, audience, context, constraints, and output format — then compiles them into a structured prompt. The extension adds the same actions next to the chat input inside ChatGPT, Claude, Gemini, and the rest of the AI chatbots you use.
Optimize in place
Click Optimize prompt. SecondBrain rewrites the draft with clearer instructions while preserving your original intent.
Save what works
Keep the prompts that produce reliable outputs, then reuse them from your saved prompt library.
Use cases
Built for prompts you run more than once.
Prompt optimization has the highest return when the task matters, repeats, or must follow a strict format. Use SecondBrain for work where a weak prompt costs time or creates rework.
Use the AI prompt generator
Turn a rough idea into a structured prompt contract with goals, context, constraints, and output format.
Optimize a rough prompt
Compare rough prompts against optimized versions for marketing, coding, and research workflows.
Replace manual rewriting and prompt enhancers
Use a faster, more transparent workflow than trial-and-error edits or generic prompt enhancers.
Why it works
SecondBrain focuses on prompt structure, not prompt fluff.
Better AI output usually comes from better requirements: a clearer task, fewer conflicting instructions, a defined output shape, and constraints the model can follow. SecondBrain applies that structure where you already work.
Clarifies the objective
Transforms vague requests into outcome-first instructions that make success easier to evaluate.
Tightens constraints
Adds practical boundaries such as length, audience, tone, format, and what the answer should avoid.
Reduces repeat work
Turns working prompts into reusable assets instead of forcing you to rebuild the same request every week.
FAQ
Common questions about the AI prompt generator.
What is an AI prompt generator?
An AI prompt generator turns your goal, audience, context, constraints, and desired output format into a structured AI prompt the model can follow. The best prompt generators ask clarifying questions before generating, instead of just padding your idea with adjectives.
Is SecondBrain a free prompt generator?
Yes. SecondBrain's web prompt generator and prompt optimizer are free to use. The Chrome extension is also free to install from the Chrome Web Store.
Does the prompt generator work with ChatGPT, Claude, and Gemini?
Yes. SecondBrain works across ChatGPT, Claude, Gemini, Grok, Meta AI, DeepSeek, Perplexity, and Copilot. Prompts built with the generator are designed to be reusable across major AI models.
What is the difference between a prompt generator and a prompt optimizer?
A prompt generator builds a structured prompt from scratch starting from your goal and use case. A prompt optimizer takes an existing rough prompt and rewrites it for clarity, structure, and constraint coverage. SecondBrain offers both.
Can I save prompts the generator creates?
Yes. SecondBrain stores saved prompts locally in your browser so you can reuse them across recurring workflows without rebuilding the same prompt each time.
How is an AI prompt writer different from a prompt generator?
A prompt generator builds the full instruction set from your use case. An AI prompt writer typically focuses on drafting or polishing the wording. Strong tools do both: they ask for missing variables first, then structure the final prompt.
Prompt resources