You’ve got the idea. It’s the PRD, the feature specs, the user flows, and the wireframes that never quite get written. Planning is where the time leaks out. Manyfast (매니패스트) is a tool that writes those planning docs for you by talking them through with an AI. I haven’t used it myself — this is a look at what it is, based on the official site and the examples it publishes.
What Manyfast is
In one line: you talk, and the plan gets written. Say you want to build a meeting-room booking app. You describe the idea, the AI asks questions back, and it drafts a PRD — then feature specs, a user flow, and a wireframe, all on one canvas. The point is that you don’t hop between four different tools to get there.
When the plan is done, you export it to Excel, an image, or Markdown. There’s also an MCP hook. Connect Manyfast to an AI coding tool like Claude Code or Cursor, and that tool reads your Manyfast docs and starts building to the plan. It cuts out the copy-paste between planning and implementation. Manyfast is a Korean-built product with an English version.
How you use it
The flow is simple. Sign up with Google or email, set your name and role, and you land on the main screen.
There are three ways to start a project. Start from a questionnaire, where the AI asks the foundational questions (“who’s the main user?”) and builds the plan through that back-and-forth. Extract from your materials, where you upload existing files (PDF, Word, Excel, images) and it drafts a PRD from them. Or a blank project, for when you’d rather drive.
The work happens in a chat with an AI agent named Manny. Manny drafts, you read it and ask for changes, it refines. One tip from the official docs is worth stealing: ask it to point out the parts you missed or didn’t think of. It surfaces the decisions you skipped past.
The documents stack up in four stages. Here is how the site describes each one.
| Stage | What it produces (per the site) |
|---|---|
| 1. PRD | What you’re building and why, written down |
| 2. Feature specs | The purpose, scope, and behavior of each feature |
| 3. User flow | The user’s journey, laid out visually |
| 4. Wireframe | Screen layout and information hierarchy, fast |
There’s also an information-architecture document you can add inside the editor. But the four above are the headline flow the site leads with. When you’re done, you export — Excel, image, Markdown — or hand off over MCP to your coding tool. The MCP handoff needs the paid plan.
The examples the site shows
Since I haven’t run it, the examples were the part I looked at hardest. There’s no downloadable template library, but the site does walk through a few.
The running example across the feature pages is MeetFlow, a meeting-room booking tool. The premise is a B2B app that standardizes booking to cut double-bookings and no-shows. The demo shows a one-line definition expanding into a full PRD — background, user problems, solution, differentiators — and then carrying on into specs, a user flow, and a wireframe. I couldn’t confirm whether MeetFlow opens as a real sample project inside the app, so treat it as the walkthrough the site shows.
Manyfast’s blog has a “playbook” with worked examples on real projects. One is reverse-planning. They take the open-source budgeting app Actual Budget, have Codex analyze the codebase, and use Manyfast’s MCP to fill an empty project’s PRD and specs. The playbook reports the result — 8 requirements, 32 features, 39 specs — then rewrites those specs into “the user can…” acceptance criteria. Another walks through a home-workout routine app: upload scattered notes, analyze them with Manny, and shape them into a PRD. Both list the time and credits the site says each step took, which helps you picture the real effort.
Pricing and limits
The pricing below is from the official page as of July 2026. It can change, so check the pricing page for current numbers before you pay.
| Plan | Price | Credits / projects | Key |
|---|---|---|---|
| Starter (free) | $0 | 30 credits/day / up to 3 | AI chatbot, real-time collab, 3 exports per project, 25 wireframes |
| Pro | $20/mo | 1,000/mo / unlimited | Smarter AI model, MCP unlocked, unlimited export |
| Elite | $80/mo | not listed | Business extras, priority support |
| Enterprise | Contact | Custom | For larger teams |
A few limits are worth knowing. The free plan caps you at 30 credits a day and three projects, and the MCP handoff I mentioned is Pro-only. Credits get spent as you work — drafting a PRD from an uploaded file runs around 20–30 credits a go, per the site — so a free day disappears faster than you’d expect.
The limit that matters most: don’t take the AI’s output as finished. That isn’t my warning, it’s the one Manyfast’s own playbook makes. In the reverse-planning example they tell you to check each generated requirement against the source and rewrite it. Treat an AI-written plan as a fast first draft to verify, not the final word.
So, who is it for?
It fits people for whom planning is the bottleneck. The solo developer who has ideas but stalls at the PRD and the screens, the early startup, and anyone pushing an idea straight into AI coding — the vibe-coding path we’ve written about before. If you already use Claude Code or Cursor, the MCP handoff is the real draw. If you’ve got a planning process you’re happy with, there’s less reason to switch.
If it were me, I’d run one small idea end to end on the free plan, read the draft it produces with a critical eye, and decide on paying from there. The tool doesn’t do your planning for you — it hands you a fast draft. Go in expecting an assistant, not an author, and you won’t be let down.