Prompt Builder· AI prompt builder
Generate, optimize, test, and manage AI prompts in one place. Turn an idea into a ready-to-use prompt in seconds.
What is Prompt Builder?
Prompt Builder is an AI prompt builder.
Prompt Builder is a prompt engineering workspace for writing, testing, and saving prompts. Describe the task in plain English, and it helps you create a prompt that matches the model you choose.
Start with a draft, refine it in chat, save or pin versions, then run them when you are ready. It works with GPT, Claude, Gemini, Llama, Mistral, DeepSeek, Grok, Perplexity, and more. You also get an Optimizer, an assistant for quick tests, and a library of reusable prompts and templates from the community.
Turn an idea into a ready-to-use prompt in seconds. Refine it in chat, save it to your Library, and run it anytime.
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FounderPlaybooks.
What other founders did to grow.
2722 dispatches from hundreds of founders, pulled from the week's best podcasts.
I've been working mainly with French influencers because I noticed that there was no one in France doing something like to help women by cutting a sugar process
Pick An Untapped Geography Where No Local Creator Already Owns The Niche
David's edge wasn't the product, it was geography. By cloning a proven English-language app into France, where no local creators were already covering the quit-sugar angle, every French influencer collab was greenfield reach for the category. The original keeps the English market; he owns France uncontested.
We have given more than 20 million subscriptions like 20 million subscriptions we gifted more subscriptions than we because like now we have 6 million active subscribers maybe we have sold 10 million or so but we have given 20 million.
Flo Gifted 20M+ Subscriptions in 50+ Countries — More Than It Has Ever Sold
In countries where women genuinely cannot afford a subscription — no credit card, or simply no disposable income — Flo unlocked the full product for free rather than leave 99%+ of users locked out. The company has gifted more subscriptions than it has ever sold: 20M gifted vs ~10M sold. There is no direct business return — only the mission alignment that makes employees and paying users more committed.
There's a play for whatever you're stuck on.
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