7 free AI-powered web tools, all running on n8n webhooks with GPT-4o-mini. No login required.
Built by a 17-year-old developer during a 24-hour challenge.
A collection of 7 free AI-powered tools that you can use right now in your browser. No accounts, no API keys, no limits. Just paste your input and get professional AI-generated output in seconds.
Each tool has:
- A beautiful landing page (dark theme, responsive, mobile-friendly)
- A REST API you can call programmatically
- An n8n workflow template you can import into your own instance
| # | Tool | Description | Try It |
|---|---|---|---|
| 1 | AI Email Writer | Generate professional emails in any tone | Launch |
| 2 | AI LinkedIn Post Generator | Create engaging LinkedIn content with hooks and hashtags | Launch |
| 3 | AI Code Reviewer | Get detailed, senior-level code reviews with ratings | Launch |
| 4 | Roast My Code | Get your code hilariously roasted (but learn real tips) | Launch |
| 5 | Roast My Website | Enter any URL for a hilarious design and UX roast | Launch |
| 6 | AI Regex Generator | Describe what to match in plain English, get working regex | Launch |
| 7 | AI Tools Hub | Central directory page linking to all tools | Launch |
Turn rough ideas into polished, professional emails in seconds.
- 8 email types: follow-up, cold outreach, thank you, apology, introduction, request, announcement, and more
- 6 tones: professional, casual, friendly, formal, persuasive, empathetic
- Optional recipient field for personalization
- Saves 10+ minutes per email
Example: "Tell my professor I need an extension on my paper because I was sick" --> Gets you a polished, respectful email ready to send.
Create scroll-stopping LinkedIn posts that actually get impressions.
Launch LinkedIn Post Generator
- 5 tone options: professional, storytelling, thought leadership, casual, inspirational
- 3 length options: short, medium, long
- Auto-generates hooks, CTAs, formatting, and hashtags
- Great for founders, job seekers, and anyone building their personal brand
Example: "I just launched my first SaaS product after 6 months of building" --> Gets you a viral-worthy LinkedIn post.
Get instant, senior-engineer-level code reviews powered by AI.
- Supports 16+ programming languages (Python, JavaScript, TypeScript, Go, Rust, Java, C++, and more)
- Structured feedback: Critical Issues, Warnings, Suggestions, Improved Code, Key Takeaways
- Identifies security issues, anti-patterns, and optimization opportunities
- Like having a senior developer review your PRs 24/7
Learn from your mistakes -- with laughs.
- Paste any code and get a savage, funny, but educational roast
- Sections: First Impressions, The Good, The Bad, The Ugly, Roast Score (0-10)
- Actually helpful -- real feedback disguised as comedy
- Supports 15+ programming languages
Example: Paste a basic function --> "Ah yes, the classic add function -- the culinary equivalent of boiling water and calling yourself a chef."
Your website called. It wants a redesign.
- Enter any URL and get a hilarious design and UX roast
- AI visits your site, analyzes the design, layout, typography, and UX
- Covers: layout, color scheme, accessibility, mobile responsiveness
- Brutally honest but genuinely useful feedback
- Great for getting a fresh perspective on your site's design
Stop Googling regex. Just describe what you want to match.
- Describe your pattern in plain English (e.g., "match email addresses" or "extract phone numbers")
- Get a working regex pattern with detailed explanation
- Includes test examples showing what matches and what doesn't
- Supports common regex flavors (JavaScript, Python, PCRE)
- Never write regex from scratch again
Each tool follows the same architecture pattern using n8n workflow automation:
Landing Page Workflow
+------------------+
User Browser ---> | Webhook (GET) | ---> Returns HTML page
+------------------+
When user submits form:
API Workflow
+------------------+ +---------------------+
Form POST ---> | Webhook (POST) | --> | AI Agent + OpenAI |
+------------------+ +---------------------+
|
+------------------+ +------------------+
<--- | Respond Webhook | <-- | Format Response |
+------------------+ +------------------+
Key details:
- All tools use GPT-4o-mini via n8n's built-in OpenAI integration
- Landing pages are server-rendered HTML returned by webhook GET requests
- API endpoints accept POST requests and return JSON or HTML responses
- No external hosting needed -- everything runs on n8n Cloud
- Each tool is a pair of workflows: one for the landing page, one for the API
All API endpoints accept POST requests with form data or JSON body. No authentication required.
Endpoint: https://crazeemedia.app.n8n.cloud/webhook/ai-email-api
| Parameter | Type | Required | Description |
|---|---|---|---|
context |
string | Yes | What the email should say |
tone |
string | No | professional, casual, friendly, formal, persuasive, empathetic (default: professional) |
emailType |
string | No | follow-up, cold-outreach, thank-you, apology, introduction, request, announcement |
recipient |
string | No | Who the email is addressed to |
curl -X POST https://crazeemedia.app.n8n.cloud/webhook/ai-email-api \
-d "context=Follow up on job interview at Google last week" \
-d "tone=professional" \
-d "emailType=follow-up"Endpoint: https://crazeemedia.app.n8n.cloud/webhook/linkedin-api
| Parameter | Type | Required | Description |
|---|---|---|---|
topic |
string | Yes | What the post should be about |
tone |
string | No | professional, storytelling, thought-leadership, casual, inspirational |
length |
string | No | short, medium, long |
curl -X POST https://crazeemedia.app.n8n.cloud/webhook/linkedin-api \
-d "topic=Why remote work is the future of tech" \
-d "tone=thought-leadership" \
-d "length=medium"Endpoint: https://crazeemedia.app.n8n.cloud/webhook/code-review-api
| Parameter | Type | Required | Description |
|---|---|---|---|
code |
string | Yes | The source code to review |
language |
string | No | Programming language (default: auto-detect) |
curl -X POST https://crazeemedia.app.n8n.cloud/webhook/code-review-api \
-H "Content-Type: application/json" \
-d '{"code": "def fib(n):\n if n <= 1: return n\n return fib(n-1) + fib(n-2)", "language": "python"}'Endpoint: https://crazeemedia.app.n8n.cloud/webhook/roast-code-api
| Parameter | Type | Required | Description |
|---|---|---|---|
code |
string | Yes | The source code to roast |
language |
string | No | Programming language (default: auto-detect) |
curl -X POST https://crazeemedia.app.n8n.cloud/webhook/roast-code-api \
-d "code=var x = new Array(); for(var i=0;i<10;i++){x.push(i);}" \
-d "language=javascript"Endpoint: https://crazeemedia.app.n8n.cloud/webhook/roast-my-website
| Parameter | Type | Required | Description |
|---|---|---|---|
url |
string | Yes | The URL of the website to roast |
curl -X POST https://crazeemedia.app.n8n.cloud/webhook/roast-my-website \
-d "url=https://example.com"Endpoint: https://crazeemedia.app.n8n.cloud/webhook/regex-generator
| Parameter | Type | Required | Description |
|---|---|---|---|
description |
string | Yes | Plain English description of the pattern to match |
curl -X POST https://crazeemedia.app.n8n.cloud/webhook/regex-generator \
-d "description=Match all valid email addresses"Want to run these tools on your own n8n instance? All 13 workflow JSON files are included in the /workflows directory.
| # | File | Description |
|---|---|---|
| 1 | ai-email-writer-landing-page.json |
Email Writer web interface |
| 2 | ai-email-writer-api.json |
Email Writer API backend |
| 3 | ai-linkedin-post-generator-landing-page.json |
LinkedIn Post Generator web interface |
| 4 | ai-linkedin-post-generator-api.json |
LinkedIn Post Generator API backend |
| 5 | ai-code-reviewer-landing-page.json |
Code Reviewer web interface |
| 6 | ai-code-reviewer-api.json |
Code Reviewer API backend |
| 7 | roast-my-code-landing-page.json |
Code Roast web interface |
| 8 | roast-my-code-api.json |
Code Roast API backend |
| 9 | roast-my-website-landing-page.json |
Website Roast web interface |
| 10 | roast-my-website-api.json |
Website Roast API backend |
| 11 | ai-regex-generator-landing-page.json |
Regex Generator web interface |
| 12 | ai-regex-generator-api.json |
Regex Generator API backend |
| 13 | ai-tools-hub.json |
Central hub/directory page |
- Import the workflow JSON files into your n8n instance (Workflows > Import from File)
- Connect your OpenAI API credentials in each API workflow
- Update the API URLs in each landing page workflow to point to your new webhook URLs
- Activate both the API and landing page workflows
- Visit the landing page webhook URL in your browser
Full setup guide available in the n8n AI Templates documentation.
Python example scripts are available in the /examples directory:
import requests
# AI Email Writer
response = requests.post(
"https://crazeemedia.app.n8n.cloud/webhook/ai-email-api",
data={
"context": "Follow up on my internship application",
"tone": "professional",
"emailType": "follow-up"
}
)
print(response.text)
# AI Code Reviewer
response = requests.post(
"https://crazeemedia.app.n8n.cloud/webhook/code-review-api",
data={
"code": "def add(a, b): return a + b",
"language": "python"
}
)
print(response.text)
# AI Regex Generator
response = requests.post(
"https://crazeemedia.app.n8n.cloud/webhook/regex-generator",
data={"description": "Match US phone numbers in any format"}
)
print(response.text)See the /examples directory for complete scripts for each tool.
Want the full n8n workflow bundle with setup guide?
| Product | Description | Link |
|---|---|---|
| n8n AI Templates Bundle | All 13 workflow JSONs + detailed setup guide | Get on Payhip |
| Prompt Engineering Cheat Sheet | 50+ tested prompts for developers | Get on Payhip |
Visit the Payhip Store for all products.
I'm Armani, a 17-year-old developer. I built these tools during a 24-hour challenge to create useful things that people can actually use -- for free. Too many AI tools are locked behind paywalls and signups. I wanted to change that.
These tools run on n8n Cloud with OpenAI's GPT-4o-mini, so they're fast, reliable, and always available.
- Backend: n8n Cloud -- workflow automation platform
- AI Model: GPT-4o-mini via n8n's built-in OpenAI nodes
- Frontend: Server-rendered HTML via n8n webhook responses (dark theme, responsive)
- Hosting: n8n Cloud (always on, no cold starts, no external servers)
- Architecture: Each tool = 2 workflows (landing page + API), all using the same 4-node pattern
If these tools saved you time or helped you out, consider supporting the project:
Your support helps me:
- Keep these tools free and running
- Build more useful AI tools
- Cover hosting and API costs
- Keep learning and building as a young developer
- AI Email Writer
- AI LinkedIn Post Generator
- AI Code Reviewer
- Roast My Code
- Roast My Website
- AI Regex Generator
- AI Tools Hub (central directory)
- AI Resume Bullet Point Generator
- AI Twitter/X Thread Writer
- AI Blog Post Outliner
- API rate limiting and usage dashboard
- Shareable result links
Want a specific tool? Open an issue and let me know!
Got ideas? Found a bug? Want to add a tool?
- Fork this repo
- Open an issue describing what you want to build
- Submit a PR
The n8n workflow pattern is simple and repeatable:
- Create a Webhook node (GET for landing page, POST for API)
- Add an AI Agent + OpenAI Chat Model node with your system prompt
- Add a Code node to format the response
- Add a Respond to Webhook node to return the result
All contributions are welcome!
MIT License -- Use these tools however you want. See LICENSE for details.
Built with determination by Armani, a 17-year-old developer
Part of a 24-hour coding challenge. Ship fast, help people, make cool things.