---
title: "Prompt Checker for Lovable, Bolt, Cursor and Claude Code | Flowmaps"
description: "Free prompt checker for Lovable, Bolt, Cursor and Claude Code: paste a prompt and see what's missing before it costs you credits."
source: "https://flowmaps.app/tools/prompt-checker"
---

# Prompt checker for AI app builders

Paste a prompt before you send it to Lovable, Bolt, v0, Cursor or Claude Code. You'll see what's missing, why it matters, and a better version to copy. No account needed.

## What the checker looks for

| One job        | One feature per prompt. Whole-app prompts make the AI guess.       |
| -------------- | ------------------------------------------------------------------ |
| Where          | The page or screen, so the AI doesn't search your whole app.       |
| Who            | Who can see or use it, so data doesn't show to the wrong people.   |
| Done when      | A check the AI can test against, and so can you.                   |
| Don't touch    | What to leave alone, so nothing else changes.                      |
| No vague words | "Modern" or "cleaner" means something different to everyone.       |
| The error      | When something's broken: the exact message, and what you expected. |

## A good prompt, for example

> On the Bookings page, add a "Cancel booking" button next to each upcoming booking. When the owner clicks it, ask "Are you sure?", then mark the booking as cancelled and email the walker. Only the owner who made the booking can cancel it. Don't change the calendar or the payment flow. Done when a cancelled booking shows as Cancelled and the walker gets an email.

It does one thing, says where, says who may do it, names what to leave alone and ends with a check. More in [How to write prompts for AI app builders](https://flowmaps.app/guides/how-to-write-prompts-for-ai-app-builders).

## Frequently asked questions

### What makes a good prompt for an AI app builder?

One job, a place, and a check. Say what to build, on which page, for whom, and how you'll know it works. Add what it shouldn't touch.

### Why do vague prompts cost more credits?

A vague prompt makes the AI guess. It often changes more than you meant, and every message you send to undo that costs credits too.

### Does this checker use AI?

No. It checks your prompt against simple rules in your browser. Your prompt isn't sent anywhere.

### Should I write one big prompt for my whole app?

No. Build one feature at a time, in a planned order, and test each one before the next. Flowmaps writes those per-feature prompts for you.

## Skip writing prompts by hand

Flowmaps plans your app feature by feature and writes a clear build prompt for each one, with the place, the checks and what not to touch. Free to start.

[Start free](https://flowmaps.app/login?new=1)