ChatAI - From Need to Innovation in One Week
The journey of creating my own AI tool to solve a real problem: building a personal AI ecosystem that's radically cheaper, fully customizable, and superior to existing workflows
The Challenge: Forging My Own Tool
During a career transition moment, I faced a challenge that drove my creativity: the need for cutting-edge AI tools for my personal projects, but without the prohibitive costs of subscriptions. Market solutions were a paradox: free ones were limited, and paid ones were a financial drain.
It was in this scenario that ChatAI was born, not as an academic exercise, but as a pragmatic solution to a real and immediate problem: mine.
The goal was clear: design and build, in one week, a personal AI ecosystem that was radically cheaper, fully customizable, and superior to the workflow offered by existing tools.
Phase 1: Discovery & Initial Design
This phase was about immersion. I needed to deeply understand the competitive landscape and clearly define the problem to be solved.
Initial Concept
First attempt at solving the problem - basic chat interface with OpenAI integration
Competitive Analysis & Problem Definition
Critical analysis of ChatGPT, Claude, and Grok revealed key opportunities: no tool offered granular model control or optimized multimodal workflow without subscription costs.
| Tool | Strengths | Weaknesses (Opportunity) |
|---|---|---|
| ChatGPT (Plus) | Model quality, plugin ecosystem | Fixed cost ($20/month), slow model switching, UI noise |
| Claude | Excellent for long context, natural writing | Free plan limitations, less focused on multimodality |
| Grok | Real-time data access | Locked to X ecosystem, less versatile for code |
Key Insight:
No tool offered granular control over models or was optimized for a multimodal workflow (text, image, code) without imposing a subscription cost or complex interface.
Enhanced UI (After Research)
Applied insights from competitive analysis - improved layout and user flow
Refined Experience
Further refinement based on initial user testing and feedback
My Process: A Sprint in Double Diamond
To structure my work and ensure I was not only building the right product, but also building the product the right way, I adopted the principles of the Double Diamond design model. I adapted its phases to fit an intensive one-week sprint, focusing on converging and diverging rapidly.
Discover
Competitive analysis, user research, problem identification
Define
Problem definition, user personas, journey mapping
Develop
Prototyping, technical architecture, rapid iteration
Deliver
Production deployment, testing, optimization
Structured Thinking
Even informal application of a process like Double Diamond is a force multiplier. Investing time in Discovery and Definition saved me from building wrong features.
Rapid Convergence
The focused approach allowed the Development phase to be extremely targeted, avoiding scope creep and maintaining velocity.
Quality Assurance
Each phase had clear deliverables and validation points, ensuring the final product met the original objectives.
Phase 2: Development & Technical Evolution
With a clearly defined problem and competitive landscape understood, the development phase focused on building the solution with technical excellence and user-centered design.
Technical Architecture & Engineering Pillars
The Acceleration Stack
Next.js (App Router)
Single-component approach blending frontend and backend for maximum development speed.
Supabase
Backend-in-a-box solution enabling rapid development without infrastructure complexity.
Engineering Pillars
Clean Code & Design System
Modular architecture with Shadcn/UI and TailwindCSS from day one.
Performance First
React.memo, virtual scrolling, and optimized component loading.
Technical Implementation
Core API integration and backend architecture - OpenAI integration with proper error handling and rate limiting
Enhanced Features
Multimodal capabilities and advanced UX features - image analysis, video generation, and model switching
UI Polish
Refined user interface and enhanced visual design - improved typography, spacing, and micro-interactions
Final Polish
Production-ready interface with optimized performance - authentication, database integration, and deployment preparation
Phase 3: Redesign - The Minimalist Evolution
After months of daily use, I found myself getting tired of the colorful design. I wanted something more minimal, clean, and focused on content rather than visual noise.
The Evolution: From Colorful to Minimalist
Initial Approach
Started with vibrant colors and complex UI elements to showcase technical capabilities and create visual interest.
User Fatigue
After months of daily use, the colorful interface became distracting and started to interfere with productivity.
Redesign Concept
First attempt at minimalist design - removing visual clutter and focusing on content
Minimalist Refinement
Further refinement of the minimalist approach - cleaner typography and spacing
Current State (Production Ready)
The current production version - minimalist, fast, and optimized for daily use
The Minimalist Philosophy
“The best design is the one that gets out of the way. When the interface disappears and you're left with pure functionality, that's when you know you've succeeded.”
Content First
Every element serves a purpose, no decorative distractions
Speed & Clarity
Reduced cognitive load for faster decision making
Long-term Usability
Design that doesn't fatigue over extended use
Results and Success Metrics
The final result is a tool that became the center of my development universe. ChatAI is not just a product case; it's proof of my work philosophy.
Quantitative Impact
Cost Reduction > 75%
My monthly AI costs dropped from ~$20 to ~$2-5.
Efficiency Increase ~20%
Time to debug problems using screenshots was significantly reduced.
Key Features
Unified Chat Interface
Single interface for text, image, and video AI models
Screenshot Analysis
Upload screenshots for AI-powered debugging and analysis
Multimodal Generation
Generate images and videos directly in chat conversations
Model Switching
Seamless switching between different AI models
Conversation History
Persistent chat history with real-time synchronization
Pay-per-use Model
Only pay for what you use, no subscription fees
Phase 4: Final Interface & User Experience
The final interface represents the culmination of user research, technical development, and design iteration. Each component was carefully crafted to address the identified pain points.
UX/UI Design Principles
Developer-First
Interface optimized for developer workflow with quick model switching and code-friendly interactions.
Speed & Efficiency
Minimized clicks, keyboard shortcuts, and streamlined workflows to reduce cognitive load.
Cost Transparency
Clear cost indicators and usage tracking to maintain budget awareness and control.
Authentication & Security
Secure, frictionless authentication system with Supabase Auth integration
Navigation & Menu System
Intuitive navigation designed for developer workflow with quick access to all features
Custom Model Selection
Granular control over AI models - addressing the core pain point of model switching
Video Generation Demo
Multimodal capabilities - text, image, and video in one unified interface
Final Production Interface
The complete solution - addressing all identified user needs with a cohesive design system
Ready to Build Your Own AI Tool?
ChatAI represents the future of personal AI tools - where customization, cost-efficiency, and developer experience come together.