All Ideas
All Startup Ideas
AI Tools~6 hours to build

AI Email Reply Drafter

Clear your inbox faster without sounding like a robot.

The Problem

Email takes hours every day. Crafting professional responses is mentally draining, especially for non-native English speakers or anyone dealing with difficult emails. ChatGPT can help, but copying back and forth is tedious, and the tone is never quite right.

The Solution

A focused tool for email replies. Paste the email you received, optionally add key points you want to include, select a tone, and get a polished reply. Learn your writing style from samples to match your voice perfectly.

How it works:

1

Paste email

The message you need to reply to

2

Add notes

Key points to include

3

Get reply

Ready to copy and send

Market Research

  • Professionals spend 28% of workweek on email (McKinsey)
  • AI email tools like Superhuman and Shortwave charging $30/mo
  • Simple, standalone reply tool—no need to replace entire email client

AI Prompts to Build This

1. Project Setup

Create a simple Next.js app for AI email replies. Features: - Input: paste email text - Optional: key points/notes to include - Tone selector: professional, friendly, firm, apologetic - Output: generated reply with copy button - History: recent replies for reference Keep it fast and focused—no account needed for basic use.

2. Reply Generation

Create the AI reply generation: Prompt to Claude/GPT: "You are an expert email writer. Write a reply to this email. - Tone: {professional/friendly/firm/apologetic} - Key points to include: {user's notes} - Keep it concise but complete - Match common professional email conventions - Don't be overly formal or stiff - Include appropriate greeting and sign-off" Generate 2-3 variations so user can pick preferred style.

3. Voice Learning

Add premium feature: learn user's writing style 1. User provides 5-10 sample emails they've written 2. AI analyzes: sentence length, vocabulary, greeting/closing style, common phrases 3. Create "style profile" stored with user account 4. Include style context in generation prompt 5. Result: replies that sound like the user actually wrote them Charge for this as pro feature—clear value add.

Want me to build this for you?

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