Product Planning · PRD Guide
Before a single screen is built, a Product Requirements Document decides whether your Bubble.io project stays on time and on budget. Here is what it must contain.
A Product Requirements Document, or PRD, is the written agreement between your idea and the people who build it. It states what the product does, who uses it, what is in the first release, and what is deliberately left out. Without one, a developer is guessing at your intent and you are guessing at their price.
This guide covers what a PRD is, why it matters more on a fast platform like Bubble.io, the nine sections it should contain, and a short checklist to tell whether yours is ready.
What a PRD is, and what it is not
A PRD is not a design file, a pitch deck or a long essay about your vision. It is a working document that answers one question: what exactly are we building? A good PRD is specific enough that two different developers would build roughly the same product from it, and would quote roughly the same cost.
- It is: scope, user flows, data structure, business rules, integrations and an estimate.
- It is not: visual design, a marketing plan, or a list of every feature you might ever want.
Why a PRD matters more when you build on Bubble.io
Bubble lets you move fast, and that speed is the risk. When changes are cheap to make, they get made constantly, and a project drifts without anyone deciding it should. The usual symptoms are a growing feature list, a database reshaped halfway through, and a launch date that keeps moving. The PRD is the fixed reference point that makes each change a conscious choice. For more on holding the line, see our guide to MVP scope creep.
It also protects you on cost. Bubble apps are priced on scope, and scope is only visible once flows and data are written down. A quote without a PRD behind it is an opinion. A quote built from a PRD is a calculation.
The nine sections of a Bubble.io PRD
1. Product vision and problem definition
One paragraph on the problem, who has it, and how it is solved today (spreadsheets, email, a competitor). If you cannot state this in a few sentences, the idea needs refining before anything is built. Our idea validation checklist helps with that step.
2. Users and roles
List every type of person who logs in: for example client, staff member, admin. For each, note what they can see and do. Roles drive both the interface and the privacy rules, so they need to be settled early.
3. MVP scope: in and out
Two lists. What is in the first release, and what is explicitly out. The “out” list is as valuable as the “in” list because it stops scope creep before it starts. If you are struggling to cut, read MVP feature prioritisation.
4. User flows
Step by step, what a user does to complete each important task: sign up, submit a request, approve a document, pay an invoice. The number of distinct flows is one of the biggest drivers of build cost.
5. Data model
The things your app stores (data types in Bubble), their fields, and how they relate. This is the foundation, and mistakes here are the most expensive to fix later. See Bubble.io database design mistakes for what goes wrong.
6. Workflows and business rules
What happens automatically: emails sent, statuses changed, reminders scheduled, calculations made. Write the rules in plain sentences, such as “when a client uploads a document, notify the assigned staff member and set the status to Needs Review.”
7. Integrations
Payments, email, calendars, accounting tools, AI services, anything the app must talk to. Each integration adds work, so list them and mark which are essential for launch.
8. Security, performance and platform
Who may see which data, whether the app is web, mobile or both, and any compliance concerns. Decisions made here shape the privacy rules in the build. Our Bubble.io security guide explains the basics, and workload unit management matters if you expect heavy usage.
9. Cost, timeline and roadmap
A cost estimate, a build timeline, and what comes after launch. This is where the PRD turns into a decision you can make with confidence.
The sections at a glance
| Section | Question it answers | What goes wrong without it |
|---|---|---|
| Vision and problem | Why does this product exist? | You build features nobody needs |
| Users and roles | Who logs in and what can they do? | Permissions are bolted on late |
| MVP scope | What is in, what is out? | Scope creep and a moving launch date |
| User flows | How does each task work? | Developers fill gaps with assumptions |
| Data model | What is stored and how is it linked? | Rebuilds and slow, costly apps |
| Workflows and rules | What happens automatically? | Logic surprises appear after launch |
| Integrations | What must it connect to? | Hidden cost and delays |
| Security and platform | Who sees what, on which devices? | Rework and risk |
| Cost and timeline | What will it cost and when is it ready? | No basis to approve or compare quotes |
A small example: a client portal for a law firm
To show the level of detail that works, here is how a few lines of a PRD might read for a simple legal client portal.
Data types: Client, Matter, Document, Message.
Document fields: file, uploaded by, matter, status (Uploaded, Under Review, Approved), upload date.
Rule: When a client uploads a document, notify the assigned lawyer and set status to Under Review.
Out of scope for v1: e-signature, billing, mobile app.
Notice that nothing here is technical jargon. A founder who knows their business can review it and say yes, no or not yet. That is the point.
Who writes the PRD, and how long should it take?
You supply the business knowledge and the PRD author supplies the structure, the Bubble architecture and the realistic estimate. Done properly it is a conversation rather than a form to fill in. At Simple Automation Solutions this is exactly what our Discovery Sprint produces: a full PRD with scope, user flows, architecture and a cost estimate, delivered within 24 hours through online meetings and chats.
Is your PRD ready? A quick checklist
- Every user role is named, with what each can do.
- The first release is listed, and so is what is left out.
- Each key task has a written flow from start to finish.
- The data types and their relationships are drawn or listed.
- Integrations are listed and marked essential or later.
- There is an estimate and a timeline you understand.
- Someone who was not in the conversation could read it and explain the product back to you.
If you tick most of these, you are ready to get accurate quotes. If not, that is normal, and it is exactly the gap a Discovery Sprint closes. You can also read how the PRD fits into our full process from discovery to launch.
Frequently asked questions
Do I need a PRD for a small app?
Yes, but it will be short. Even a few pages that cover users, flows, data and scope will prevent most of the expensive surprises.
Can AI write my PRD?
AI can help you draft and organise it, but the valuable parts are decisions: what to cut, how data relates, what to build first. Those come from a conversation with someone who has built similar products.
Is a PRD the same as a specification or wireframes?
Not quite. Wireframes show the screens. A PRD explains the behaviour, rules and data behind them. Many projects need both, but the PRD comes first.
Does the PRD lock me in?
No. It is a baseline. Changes are still possible, but they are made deliberately and priced against the original scope.
Turn your idea into a buildable plan
Book a free 30-minute Idea Audit. You will leave knowing what to build, how to build it and what it is likely to cost.
Athar Ahmad, Certified Bubble.io Developer and Tech Architect, Simple Automation Solutions
