Lilly Tech Systems
Build an AI Writing Assistant
Build a Grammarly-style writing assistant that checks grammar, improves style, generates content, and works as both a web app and Chrome extension. Uses OpenAI for intelligent suggestions with a rich text editor interface — all in 5 hands-on steps.
What You Will Build
A complete writing assistant with grammar checking, style improvement, content generation, and a rich editor interface.
Grammar Check
LLM-based error detection with inline suggestions for spelling, grammar, and punctuation.
Style Improvement
Tone adjustment, readability scoring, conciseness suggestions, and clarity improvements.
Content Generation
Expand outlines, summarize text, rephrase sentences, and translate between languages.
Rich Editor
ContentEditable-based editor with inline highlighting, suggestion popups, and keyboard shortcuts.
Tech Stack
Minimal dependencies. Total cost: under $5/month.
Python 3.11+
Backend API for grammar checking, style analysis, and content generation.
FastAPI
Async API for real-time writing suggestions with streaming support.
OpenAI API
GPT-4o-mini for grammar checking, style analysis, and content generation.
HTML/CSS/JS
Rich text editor with contenteditable, inline highlights, and suggestion popups.
Build Steps
Follow these in order. Each builds on the previous one.
1. Project Setup
Install OpenAI, FastAPI, set up the writing assistant project structure.
2. Grammar Check
LLM-based error detection with inline correction suggestions.
3. Style Improvement
Tone adjustment, readability scoring, and conciseness analysis.
4. Content Generation
Expand, summarize, rephrase, and translate text on demand.
5. Rich Text Editor
ContentEditable editor with inline highlighting and suggestion popups.
6. Chrome Extension
Browser extension and API endpoints for production deployment.
7. Enhancements
Custom style guides, team sharing, plagiarism detection, and FAQ.