What is a mobile and web app specification?
An app requirements document, also known as a PRD (Product Requirements Document), serves as the foundation for digital products. This document must precisely describe the entire functionality of a future app — from initial concept and business objectives through user characteristics to program action scenarios.
Before drafting a specification, teams should gather comprehensive information about target audiences, competitors, and technology. A well-written PRD has no place for speculations.
The specification should cover all user interactions with the program. Teams unfamiliar with coding can use User Stories to explain conditional scenarios clearly. Additionally, specifications must include nonfunctional requirements, database communications, and API information — such as data security, social media integration, and payment methods.
Without proper specifications, projects risk significant deviations from expectations. The document enables development teams to "understand the core functionality, prepare solutions, identify threats and prepare the next stages of production."
How to prepare the Product Requirements Document?
Functional specifications aren't formulaic; they should be readable and thorough. Key sections include:
- General description with business goals and target user profiles
- Technological requirements
- Functionalities
- Data format and file structure information
- App operation scenarios
- Additional information
General Description
This section explains business objectives and rationale. Rather than showcasing company history, it clarifies why the digital product exists and what needs it addresses.
Technological and Product Requirements
Critical decisions include selecting target platforms and operating systems. Teams must decide between native apps (more optimized) or hybrid solutions (more cost-effective for multi-platform releases). The specification should detail:
- Target operating systems and versions
- External services and databases
- Administrative panel access and authorization levels
- Maintenance and support needs
- Required API documentation
Description of Functionality and App Operation Scenario
This section guides developers through the user journey step-by-step, covering:
- Login mechanisms and account integration
- Social media authentication options
- Server cooperation and offline functionality
- Geolocation and push notifications
- Menu layouts and design specifications
- Text content requirements
Additional Information
Include planned budgets, timelines, project team members, and other relevant observations. This helps development teams assess feasibility and identify necessary scope adjustments.
Why is a PRD so important?
A functional specification determines whether agencies accept projects and assess required work and potential obstacles. It enables teams to evaluate technological capability and prevent costly delays.
For clients, specifications provide concrete budget and timeline estimates, reducing risks of project underestimation or overestimation.
