System Requirements Document (SRD)

Project Name: windy-calculator

1. Introduction

The windy-calculator project aims to deliver a versatile and user-friendly calculator application tailored to meet the needs of users in India (IN). The application will focus on scientific calculations, offering advanced mathematical functions to support students, engineers, researchers, and professionals. This document outlines the system requirements for the development and deployment of the windy-calculator application.

The project is spearheaded by Mayank Kushwaha, and the design will incorporate locale-specific considerations such as Indian currency, timezone (IST), and user preferences.

2. System Overview

The windy-calculator application will be a cross-platform tool available on both web and mobile platforms. It will provide users with a robust set of scientific calculation features, including trigonometry, logarithms, exponentiation, and more. The app will prioritize ease of use, accuracy, and performance, ensuring it becomes an indispensable tool for its target audience.

Key features include:

• Advanced scientific calculations.
• Intuitive user interface optimized for both web and mobile devices.
• Locale-specific settings for Indian users.
• Responsive design with a focus on accessibility.

3. Functional Requirements

As story points:

• As a User, I should be able to perform basic arithmetic operations (addition, subtraction, multiplication, division).
• As a User, I should be able to perform advanced scientific calculations, including trigonometric functions (sin, cos, tan), logarithms, and exponentiation.
• As a User, I should be able to switch between different modes (basic and scientific).
• As a User, I should be able to view calculation history and clear it when needed.
• As a User, I should be able to customize the app theme (light/dark mode).
• As a User, I should be able to use the app offline for calculations.
• As a User, I should be able to access help or tutorials to understand advanced functions.

4. User Personas

1. Student

• Description: A college or school student who needs a reliable tool for solving mathematical problems in subjects like physics, chemistry, and mathematics.
• Goals: Perform accurate calculations, understand complex functions, and save time.

2. Engineer/Researcher

• Description: Professionals who require advanced scientific calculations for their work, such as designing systems or conducting experiments.
• Goals: Access precise and complex mathematical functions quickly.

3. General User

• Description: Individuals who need a simple and effective calculator for everyday use.
• Goals: Perform basic arithmetic operations and occasional scientific calculations.

5. Visuals Colors and Theme

Unique Color Palette:

The windy-calculator will feature a modern and vibrant color scheme inspired by the concept of "wind" and "scientific precision."

• Background: #F0F8FF (Alice Blue – calm and clean)
• Surface: #E6E6FA (Lavender – soft and professional)
• Text: #2F4F4F (Dark Slate Gray – sharp and readable)
• Accent: #4682B4 (Steel Blue – dynamic and engaging)
• Muted Tones: #B0C4DE (Light Steel Blue – subtle and unobtrusive)

6. Signature Design Concept

Interactive Wind Tunnel Homepage

The homepage of the windy-calculator will feature an interactive wind tunnel visualization. Users will see a dynamic flow of particles representing "wind" moving across the screen. These particles will subtly shift and swirl based on user interactions, such as mouse movements or touch gestures.

Key elements:

• Particle Animation: Wind particles will flow smoothly, creating a calming effect.
• Interactive Calculations: As users input numbers or select functions, the wind particles will react dynamically, forming shapes or patterns that represent the calculation process.
• Transitions: Smooth transitions between modes (basic/scientific) with animations that mimic wind gusts.
• Micro-interactions: Buttons and inputs will have hover effects resembling ripples in the wind.

This design will make the windy-calculator instantly memorable and visually captivating, ensuring users enjoy a unique and engaging experience.

7. Non-Functional Requirements

• Performance: The application must load within 2 seconds on both web and mobile platforms.
• Scalability: The system should support up to 10,000 concurrent users.
• Accessibility: The app must comply with WCAG 2.1 guidelines to ensure usability for users with disabilities.
• Localization: Default settings should align with Indian locale preferences (IST timezone, INR currency).
• Security: All user data, including calculation history, must be encrypted.

8. Tech Stack

Frontend:

• React for Web
• React Native for Mobile

Backend:

• Python
• FastAPI

Database:

• MySQL or MariaDB (preferred for relational data)
• Alembic for migrations

AI Models (if applicable):

• GPT 5.4 for user-friendly responses
• Claude 4.6 Opas for academic or coding work

AI Tools:

• Litellm for LLM Routing
• Langchain

Local Orchestration:

• Docker
• docker-compose

Server-side Orchestration:

• Kubernetes

9. Assumptions and Constraints

Assumptions:

• Users will primarily access the app from India.
• Internet connectivity may not always be available; offline functionality is essential.
• The app will be used by individuals with varying levels of mathematical expertise.

Constraints:

• The app must be lightweight to ensure compatibility with low-end devices.
• Development must adhere to a strict timeline to ensure timely delivery.
• Budget limitations may restrict the use of certain advanced technologies.

10. Glossary

• WCAG: Web Content Accessibility Guidelines – standards for making web content accessible.
• IST: Indian Standard Time – the timezone used in India.
• INR: Indian Rupee – the currency of India.
• Frontend: The user interface and experience layer of the application.
• Backend: The server-side logic and database management layer of the application.
• Docker: A tool for containerizing applications to ensure consistency across environments.
• Kubernetes: A system for automating deployment, scaling, and management of containerized applications.

This document provides a comprehensive overview of the requirements for the windy-calculator project. Let me know if there are any additional updates or refinements needed, Mayank!