How to Write a Mobile App Requirement Document (With Free Template)

Quick Answer: What is a Mobile App Requirement Document?

A Mobile App Requirement Document (often called a PRD or Scope Document) is a plain-English guide that explains exactly what your app will do, screen by screen.

Before you ever speak to a developer or agency, you must have a requirement document. Without it, you are guaranteed to experience feature creep, blown budgets, and missed deadlines.

Here is what every good requirement document must include:

• The Core Problem: What is the one specific thing this app solves?
• User Roles: Who is using the app (e.g., Customer vs. Admin)?
• User Stories: Simple sentences explaining what users need to achieve.
• Screen-by-Screen Breakdown: A simple list of what goes on every screen.
• The "Not Doing" List: A strict list of features deferred to Version 2.

If you are ready to write your own, you can skip straight to our Free App Requirement Document Template below.

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Why You Need a Requirement Document (Before Hiring)

Most non-technical founders make a fatal mistake: they get on a Zoom call with an agency, spend 30 minutes enthusiastically describing their "Uber for dog walkers" idea, and ask, "How much will it cost?"

The agency will either:

1. Quote you a massively inflated price (e.g., $50,000) to protect themselves from the unknown.
2. Quote you an artificially low price (e.g., $5,000) just to win the contract, only to trap you with expensive "change orders" later. (We cover this heavily in our guide on Why Your $20,000 App Quote is a Rip-Off).

When you hand a developer a written, 3-page requirement document, you immediately signal that you are a serious founder. It forces the developer to quote you based on exact features, not vague ideas.

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The "Not Doing" List: Your Secret Weapon

The most important part of your requirement document is not what the app does, but what it does not do.

As a founder, it is incredibly tempting to add "just one more feature." You might want to add custom chat, AI integrations, or complex referral systems. This is called Feature Creep, and it is the #1 reason apps fail to launch. (Read more: The Feature Creep Nightmare).

By writing a strict "Not Doing in Version 1" list, you protect your budget and ensure you get to market in 6 weeks instead of 6 months.

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Free Mobile App Requirement Document Template

You do not need to be technical to write this. Just copy and paste the markdown text below into a Google Doc or Notion page, and fill in the blanks in plain English.

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📱 [Your App Name] - Product Requirement Document (V1)

1. The Core Objective In one sentence, what is the primary goal of this app?

Example: "To allow local bakery customers to pre-order custom cakes directly from their phones."

2. Target Audience & User Roles Who will log into this app? List every distinct type of user.

• Role 1 (Customer): Browses cakes, pays, tracks order status.
• Role 2 (Admin/Baker): Receives orders, updates status to 'Baking' or 'Ready'.

3. The "Not Doing" List (Deferred to V2) What features are strictly excluded from this first version to save money?

• NO custom chat system (users will call the bakery directly).
• NO delivery tracking (in-store pickup only).
• NO custom AI cake designer.

4. Core User Stories (The Golden Path) Describe the exact steps a user takes to successfully use the app.

• As a Customer, I want to browse a gallery of cakes so I can see what the bakery offers.
• As a Customer, I want to select a cake and pay with Apple Pay so I don't have to wait in line.
• As an Admin, I want to receive a push notification when a new order arrives so I can start baking.

5. Screen-by-Screen Breakdown List every single screen the user will see and what buttons are on it.

Screen: Onboarding/Login

• Sign up via Email/Password or Google.
• "Forgot Password" link.

Screen: Home Dashboard (Customer)

• Grid of 6 popular cake categories.
• Bottom navigation bar (Home, Orders, Profile).

Screen: Checkout

• Summary of item.
• Stripe / Apple Pay integration.
• "Confirm Order" button.

6. Technical Preferences (Optional) If you have specific technical requirements, list them here.

• Must be available on both iOS and Android (Suggesting React Native or Flutter).
• Backend to be hosted on Firebase or Supabase to keep costs low.

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What to Do After Completing Your Template

Once you have filled out this template, you are ready to start interviewing developers.

Send this document to three different freelance developers or agencies and ask them for a fixed-price quote based only on this document. If they try to sell you features from your "Not Doing" list, run away.

If you are looking for developers who respect budgets and timelines, check out our Top 10 Freelance Mobile App Developers guide.

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Frequently Asked Questions

What is an app requirement document?

An app requirement document (PRD) is a written blueprint that explains the exact features, target audience, user roles, and screen-by-screen breakdown of a mobile app. It is used to get accurate cost estimates from software developers.

Do I need to be technical to write a requirement document?

No. The best requirement documents are written in plain English from the user's perspective. You should describe what the app needs to do (e.g., "User pays with Apple Pay"), and let the developer figure out how to code it.

Why is a requirement document important?

It prevents feature creep and protects your budget. If you don't define the exact scope in writing before hiring a developer, you will likely face unexpected costs, delays, and miscommunications regarding what was actually agreed upon.