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FlowLine
Design agent systems before you build it (Figma for Agents)
FlowLine is the flight simulator for AI agents. Describe your agent in plain English and it draws the full design, then runs 1,500 simulated requests to show what it will cost, how fast it answers, where it fails and where it's open to prompt injection. Fix weak spots in one click, then export to LangGraph, CrewAI, OpenAI Agents SDK, Claude Agent SDK or n8n. Free. Bring your own key, nothing stored.
Hey Product Hunt! 👋
I built FlowLine because every AI agent I shipped followed the same story: great in the demo, then production showed up with a surprise bill, requests failing quietly, and a prompt-injection hole nobody had drawn on the whiteboard.
So I built the tool I wanted before writing any code: a flight simulator for AI agents.
How it works:
🗣️ Describe your agent in plain English (or speak it). FlowLine draws the whole design: models, tools, routing, caches and human approvals.
🎲 Simulate 1,500+ requests to see the cost per request, the monthly bill, latency, the success rate, and exactly which step breaks.
🛠️ Fix it in one click. Suggestions like "this judge doesn't need GPT-6" or "nothing checks this output" re-simulate instantly, and every fix can be undone with ⌘Z.
🔍 Five lenses: Structure, Replay, Context, Cost and Risk. Risk shows whether outside text (emails, web pages, uploads) can reach a risky action like a refund.
🚀 Export to LangGraph, CrewAI, the OpenAI Agents SDK, the Claude Agent SDK or n8n.
It's free. Bring your own OpenAI key. It stays in your browser tab and is never stored.
I'd love your help with:
Designing an agent you're building (or dreaming about) and telling me if the numbers feel right
Which framework or feature I should add next
I'll be here all day answering every comment. Thanks for checking it out! 🙏
👉 https://flowline-psi.vercel.app/
About FlowLine on Product Hunt
“Design agent systems before you build it (Figma for Agents)”
FlowLine was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #145 on the daily leaderboard. FlowLine is the flight simulator for AI agents. Describe your agent in plain English and it draws the full design, then runs 1,500 simulated requests to show what it will cost, how fast it answers, where it fails and where it's open to prompt injection. Fix weak spots in one click, then export to LangGraph, CrewAI, OpenAI Agents SDK, Claude Agent SDK or n8n. Free. Bring your own key, nothing stored.
On the analytics side, FlowLine competes within Fundraising and OpenAI Day — topics that collectively have 1.5k followers on Product Hunt. The dashboard above tracks how FlowLine performed against the three products that launched closest to it on the same day.
Who hunted FlowLine ?
FlowLine was hunted by Taj | AI Engineer. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of FlowLine including community comment highlights and product details, visit the product overview.
Taj | AI Engineer