Product Requirements Document
Everything you need to know about writing a PRD that actually gets your team building the right thing — plus a free AI generator to skip the blank page.
What is a Product Requirements Document?
A Product Requirements Document (PRD) is a formal document that defines the purpose, features, and behavior of a product or feature before it is built. It is the primary communication tool between product managers, designers, and engineers — the document that answers: what are we building, for whom, and why?
A good PRD does not describe how something will be built (that is the technical spec). It describes what the product must do and the constraints within which it must operate. Engineering teams use it to scope work, design teams use it to define user flows, and leadership uses it to align on priorities.
The challenge is that most PRDs become outdated the moment development starts. Requirements shift, designs evolve, and the document no longer reflects what was actually built. This is why Omniflow introduced the concept of a Living PRD — a requirements document directly connected to your design and code, so it stays in sync automatically as your product evolves.
Owned by
Product Manager
Audience
Engineering, Design, Leadership
Output
Technical Spec, User Stories, Designs
What to include in a PRD
The eight sections every complete PRD should cover — with examples for each.
What problem does this product solve? What does success look like? Define the "why" before the "what".
Example
Teams spend 3+ hours per sprint reconciling requirements with code. Goal: reduce rework by 60%.
Who is this for? What jobs do they need to get done? Define your primary and secondary users.
Example
Primary: Product Manager (writes requirements). Secondary: Engineer (implements them).
What must the product do? Use clear, testable language. Avoid implementation details here — focus on behavior.
Example
Users must be able to invite teammates by email. Invitees must receive a confirmation email within 60 seconds.
Performance, security, scalability, and compliance requirements that constrain how the system must behave.
Example
Page load must not exceed 2 seconds on 3G. All data must be encrypted at rest and in transit.
Map the key user journeys through your product. Link to designs where available, or describe them in plain language.
Example
Onboarding flow: landing → signup → email verification → workspace setup → first project.
What data does the product store? What are the main entities and their relationships?
Example
Users, Organizations, Projects, Documents, Comments. A User belongs to one or more Organizations.
How will you know each requirement is done? Define clear pass/fail conditions for testing.
Example
Given a valid invite link, when the user clicks it, then they are added to the workspace and redirected to the dashboard.
Explicitly list what this version will NOT include. This is as important as what it will include.
Example
V1 will not include single sign-on (SSO), custom branding, or API access for third-party integrations.
The Living PRD: when documentation stays in sync with code
Traditional PRDs are snapshots. They describe the product as it was understood at planning time. Once development starts, reality diverges — engineers make implementation decisions, designs change in Figma, and the PRD quietly becomes wrong.
Omniflow solves this with a Living PRD — a structured requirements document that is directly connected to your UI/UX design and production codebase. When a PM updates a requirement, Omniflow shows exactly which design screens and code components will change — and can regenerate them automatically. The PRD is never out of sync with what was actually built.
PRD drives everything
Design and code generate from the PRD, not from a blank canvas.
Changes propagate automatically
Update a requirement and see exactly what changes before it regenerates.
Always accurate
The PRD reflects your actual product, not the version you planned six months ago.
Product Requirements Document FAQs
A Product Requirements Document (PRD) is a formal document that describes the purpose, features, functionality, and behavior of a product or feature. It serves as the single source of truth between product managers, designers, and engineers — ensuring everyone builds the same product.
A PRD is a higher-level document covering the full scope of a product or feature. User stories are granular requirements written from the user's perspective, typically used within the PRD. A technical spec is the engineering translation of the PRD — it covers implementation details like architecture and database design. Omniflow generates all three from a single source of truth.
A Living PRD stays up to date as the product evolves, rather than becoming a stale document after the first sprint. Omniflow takes this further: its Living PRD is directly connected to your design and code. When the PRD changes, design and code update automatically — so your documentation is never out of sync with what was actually built.
AI can generate a structured PRD from a plain-language product description, surface missing requirements, identify edge cases, and structure requirements into standard formats. Omniflow goes further: it uses the AI-generated PRD to drive UI/UX design and full-stack code generation simultaneously, making the PRD the operational source of truth for your entire product, not just a document.
PRDs are typically owned by the Product Manager, but written collaboratively with engineering leads, designers, and occasionally customer success. The PM owns the "what" and "why", while engineering and design inform the feasibility and the "how". Omniflow makes this collaboration more efficient by generating a PRD structure automatically and allowing the whole team to work from one shared document.
Start creating
today.
Skip the infrastructure work. Focus on what makes your product different. Omniflow keeps everything aligned from PRD to production.
Free to start · Plans from $25/mo ·
For teams & enterprises
Book a demo →