Grammarly
Grammarly •
Since 2018
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Official Docs
What is Grammarly?
GrammarlyBot is used by Grammarly's writing assistant platform to analyze web content and provide writing suggestions. As Grammarly has expanded from a simple grammar checker to a comprehensive AI-powered writing assistant, their bot helps understand various writing contexts and styles across the web. This enables Grammarly to provide more accurate and contextual suggestions to its users. The bot may access public content to improve Grammarly's understanding of language patterns and writing styles across different domains and industries.
User Agent String
Mozilla/5.0 (compatible; GrammarlyBot/1.0; +https://www.grammarly.com/bot)
How to Control Grammarly
Block Completely
To prevent Grammarly from accessing your entire website, add this to your robots.txt file:
# Block Grammarly
User-agent: GrammarlyBot
Disallow: /
Block Specific Directories
To restrict access to certain parts of your site while allowing others:
User-agent: GrammarlyBot
Disallow: /admin/
Disallow: /private/
Disallow: /wp-admin/
Allow: /public/
Set Crawl Delay
To slow down the crawl rate (note: not all bots respect this directive):
User-agent: GrammarlyBot
Crawl-delay: 10
How to Verify Grammarly
Verification Method:
Verify Grammarly user agent
Verify Grammarly user agent
Learn more in the official documentation.
Detection Patterns
Multiple ways to detect Grammarly in your application:
Basic Pattern
/Grammarly/iStrict Pattern
/^Mozilla/5\.0 \(compatible; GrammarlyBot/1\.0; \+https\://www\.grammarly\.com/bot\)$/Flexible Pattern
/Grammarly[\s\/]?[\d\.]*?/iVendor Match
/.*Grammarly.*Grammarly/iImplementation Examples
// PHP Detection for Grammarly
function detect_grammarly() {
$user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$pattern = '/Grammarly/i';
if (preg_match($pattern, $user_agent)) {
// Log the detection
error_log('Grammarly detected from IP: ' . $_SERVER['REMOTE_ADDR']);
// Set cache headers
header('Cache-Control: public, max-age=3600');
header('X-Robots-Tag: noarchive');
// Optional: Serve cached version
if (file_exists('cache/' . md5($_SERVER['REQUEST_URI']) . '.html')) {
readfile('cache/' . md5($_SERVER['REQUEST_URI']) . '.html');
exit;
}
return true;
}
return false;
}
# Python/Flask Detection for Grammarly
import re
from flask import request, make_responsedef detect_grammarly():
user_agent = request.headers.get('User-Agent', '')
pattern = r'Grammarly'
if re.search(pattern, user_agent, re.IGNORECASE):
# Create response with caching
response = make_response()
response.headers['Cache-Control'] = 'public, max-age=3600'
response.headers['X-Robots-Tag'] = 'noarchive'
return True
return False# Django Middleware
class GrammarlyMiddleware:
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
if self.detect_bot(request):
# Handle bot traffic
pass
return self.get_response(request)
// JavaScript/Node.js Detection for Grammarly
const express = require('express');
const app = express();// Middleware to detect Grammarly
function detectGrammarly(req, res, next) {
const userAgent = req.headers['user-agent'] || '';
const pattern = /Grammarly/i;
if (pattern.test(userAgent)) {
// Log bot detection
console.log('Grammarly detected from IP:', req.ip);
// Set cache headers
res.set({
'Cache-Control': 'public, max-age=3600',
'X-Robots-Tag': 'noarchive'
});
// Mark request as bot
req.isBot = true;
req.botName = 'Grammarly';
}
next();
}app.use(detectGrammarly);
# Apache .htaccess rules for Grammarly# Block completely
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Grammarly [NC]
RewriteRule .* - [F,L]# Or redirect to a static version
RewriteCond %{HTTP_USER_AGENT} Grammarly [NC]
RewriteCond %{REQUEST_URI} !^/static/
RewriteRule ^(.*)$ /static/$1 [L]# Or set environment variable for PHP
SetEnvIfNoCase User-Agent "Grammarly" is_bot=1# Add cache headers for this bot
<If "%{HTTP_USER_AGENT} =~ /Grammarly/i">
Header set Cache-Control "public, max-age=3600"
Header set X-Robots-Tag "noarchive"
</If>
# Nginx configuration for Grammarly# Map user agent to variable
map $http_user_agent $is_grammarly {
default 0;
~*Grammarly 1;
}server {
# Block the bot completely
if ($is_grammarly) {
return 403;
}
# Or serve cached content
location / {
if ($is_grammarly) {
root /var/www/cached;
try_files $uri $uri.html $uri/index.html @backend;
}
try_files $uri @backend;
}
# Add headers for bot requests
location @backend {
if ($is_grammarly) {
add_header Cache-Control "public, max-age=3600";
add_header X-Robots-Tag "noarchive";
}
proxy_pass http://backend;
}
}
Should You Block This Bot?
Recommendations based on your website type:
| Site Type | Recommendation | Reasoning |
|---|---|---|
| E-commerce | Optional | Evaluate based on bandwidth usage vs. benefits |
| Blog/News | Allow | Increases content reach and discoverability |
| SaaS Application | Block | No benefit for application interfaces; preserve resources |
| Documentation | Selective | Allow for public docs, block for internal docs |
| Corporate Site | Limit | Allow for public pages, block sensitive areas like intranets |
Advanced robots.txt Configurations
E-commerce Site Configuration
User-agent: GrammarlyBot
Crawl-delay: 5
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Disallow: /api/
Disallow: /*?sort=
Disallow: /*?filter=
Disallow: /*&page=
Allow: /products/
Allow: /categories/
Sitemap: https://example.com/sitemap.xml
Publishing/Blog Configuration
User-agent: GrammarlyBot
Crawl-delay: 10
Disallow: /wp-admin/
Disallow: /drafts/
Disallow: /preview/
Disallow: /*?replytocom=
Allow: /
SaaS/Application Configuration
User-agent: GrammarlyBot
Disallow: /app/
Disallow: /api/
Disallow: /dashboard/
Disallow: /settings/
Allow: /
Allow: /pricing/
Allow: /features/
Allow: /docs/
Quick Reference
User Agent Match
GrammarlyRobots.txt Name
GrammarlyBotCategory
otherRespects robots.txt
Yes
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