Database schema written out in full
Tables, columns and relationships are listed explicitly, so the backend is provisioned once rather than re-guessed on every follow-up.
TheMegaPrompt
Vision → gap analysis → ROI → stack → Mega-Prompt
The ultimate PRD & Mega-Prompt generator for Lovable
Answer five guided steps and get a Lovable-ready Mega-Prompt for apps and websites: product scope, database schema, auth roles, RLS policies and credit guardrails — all in one paste.
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Step 1 of 5 — Vision20%
Step 1 — Your product vision
Describe Your App, Website or Landing Page Idea
Plain words are perfect — no technical language needed. Who is it for, what do they do, and what should the first version of your app or website include?
Prompt qualityNothing yet
Start with one sentence: who is it for and what do they do with it? (0 words)
Smart defaults (saves build credits)
These are AI recommendations read straight from your description — adjust them only if something looks wrong. Anything you write later in the text always wins over these switches.
Making money (is this a paid product?)
Free / internal tools skip payments entirely and stay on $0/mo free tiers.
Write a couple of sentences about your idea to unlock the next steps.
How TheMegaPrompt builds PRDs and architecture specs for Lovable apps and websites
Lovable provisions a full backend from your prompt, so ambiguity becomes conflicting migrations. TheMegaPrompt writes the schema, roles, row-level security expectations and scope limits for web apps and landing pages before the first generation.
Auth roles and row-level rules
The spec names each role and which rows it may read or write, which is what makes generated security policies correct.
Screens tied to the data
Every page states the data it reads and the actions it performs, so the UI and the schema stay in sync.
Credit guardrails
An explicit out-of-scope list and a ban on placeholder content keep the first build tight and cheap to iterate on.
How to use a structured PRD with Lovable
Lovable builds a full-stack app or website from your prompt, so most broken builds come from an under-specified first message: missing tables, undefined roles, or features invented on the fly. A PRD-shaped Mega-Prompt removes that ambiguity before the first generation.
1. Give Lovable the schema, not just the idea
Lovable provisions your backend from the prompt. If tables and columns are implicit, each follow-up message re-guesses them and migrations start conflicting.
- List every table with its columns and types explicitly.
- State which tables are user-scoped so RLS policies are written correctly.
- Name the roles (for example admin, staff, customer) instead of saying 'users'.
2. Lock the scope to avoid credit burn
Unrequested features are the main source of runtime errors and wasted credits: extra pages pull in extra state, extra state breaks the pages you cared about.
- Include an explicit 'do not build' list in the prompt.
- Forbid placeholder data and stub components.
- Decide up front whether payments are in-app or handled offline.
3. Paste once, then iterate in small steps
Send the whole Mega-Prompt as the first message so the initial architecture is right, then request one focused change per follow-up. Small diffs are far less likely to break a working build.
- First message: the full PRD Mega-Prompt.
- Then: one screen, one flow or one bug per message.
- Re-run the generator here whenever the product direction changes.