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Grammarly: AI Writing and Grammar Checker App
Improve your writing with all-in-one assistance—including generative AI, grammar check, and more.
Google Mail Checker
Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
QuillBot: AI Writing and Grammar Checker Tool
Elevate your writing with QuillBot's AI-powered productivity tools: Grammar Checker, Paraphraser, AI writer, Summarizer, and more!
AI-based Grammar Checker & Paraphraser – LanguageTool
Instantly Enhance Your Texts with LanguageTool’s Grammar Checker and Paraphrasing Tool
Microsoft Editor: Spelling & Grammar Checker
Write with confidence with Microsoft Editor, your intelligent grammar, spelling, and style checking writing assistant.
Checker Plus for Gmail™
Get notifications, read, listen to or delete emails without opening Gmail and easily manage multiple accounts.
WOT: Website Security & Safety Checker
Stay safe online with WOT, the ultimate website security and safety check extension
Ginger: AI Grammar & Spell Checker
Improve your English communication and write with confidence with Ginger's all-in-one AI writing companion!
CSFloat Market Checker
Shows the float value, paint seed, and screenshots of Counter-Strike (CS:GO & CS2) items on the Steam Market or Inventories
Checker Plus for Google Calendar™
See your next events, get meeting notifications and snooze events without opening the Google Calendar page!
ProWritingAid: Grammar Checker & Paraphrasing Tool
Gain confidence in your writing with the best grammar checker and paraphrasing tool that works wherever you do.
Spell Checker for Chrome
Spell Checker extension for Chrome. It's easy to use and fast. This extension supports 25 languages for spell check.
Website SEO Checker: Free Audit & Analysis
Get free on-page SEO report with the best website SEO checker. Use SEO analysis to do audit for the most valuable pages at first.
Datalayer Checker
The easiest way to debug and check the dataLayer implementations without having to use the browser console!
HTML Error Checker
Check the HTML for error. This doesn't send the source to the external. If web page behavior is not correct, you should turn off it.
CrowdTangle Link Checker
An easy way to see how often a link has been shared, who shared it and what they said!
Ban Checker for Steam
Automatically check bans of people you recently played with, your friends, and group members.
Pre-sending Checker for Gmail
Allows to pop up all lists easy to check whether or not any wrong addresses in TO/CC/BCC in your Gmail.
Sapling Grammar Checker and Writing Assistant
Improve your writing with a spell + grammar checker and writing suggestions.
WCAG Color contrast checker
To check the color contrast between foreground and background of the texts
Outwrite — Grammar checker & rewrite tool
Write perfect content with Outwrite. Check spelling & grammar, improve writing style, find synonyms and paraphrase sentences.
Checker Plus for Google Drive™
Quickly browse your Google Drive files without opening a webpage and get notifications of modifications to your shared documents
Ultimate H1B Sponsor Checker
Find if a company sponsored H1B in the past couple of years in LinkedIn, Indeed, Google and glassdoor.
Bookmarks Checker - Remove broken links
Clean up bookmarks from junk. Batch check your bookmarks to find duplicates and broken bookmark links.
Pronounce: Speech and Pronunciation Checker
Speak confidently with instant feedback on any conversation from an AI speech coach.
Serpstat Website SEO Checker
Instantly check your website's SEO, analyze competitors and get advantage of powerful search analytics in one place.
Robots Exclusion Checker
Live URL checks against robots.txt, meta robots, x-robots-tag & canonical tags. Simple Red, Amber & Green status. An SEO Extension.
Colour Contrast Checker
Check the contrast between different colour combinations against WCAG standards
Website Technology Checker by Snov.io
Identify site technologies with Snov.io Website Technology Checker.
自動価格比較／ショッピング検索（Auto Price Checker）
ショッピング中に自動的に他のショッピングサイトを検索し、安い価格順に10件表示します。検索対象の8万店以上。自動比較の対象はAmazonや楽天Booksなどショップサイトだけでなく価格.comなど価格比較サイトでも可能。テキストを選択して右クリックでの価格比較も。
MST SERP Counter - SEO Free SERP Checker Tool
SERP Counter gives accurate search result of searched 'key'word.We Can see position of result or rank
Free Spell Checker for Google Chrome™
Check your grammar, spelling and style. See word and character counts...!
SEO Tool Extension: Meta + SEO Checker
SEO Analysis, SEO Keyword Research and Content Optimization SEO Site Tools. Meta Tags Checker, SEO Title & SEO Keyword Optimizer
Amazon Keyword Ranking & Index Checker
Free 'key'word ranking & index check tool by SellerApp - The most accurate seller tool for all amazon market places.
Free Backlink Checker by LRT
Free backlink checker to verify all links on a page. Finds broken, unverified, no-follow, follow, internal, external links.
Spell checker and Grammar checker by Scribens
A powerful, free spelling and grammar checker. Scribens corrects 250 types of grammar mistakes. English and French.
DNS Checker - SEO and Domain Analysis
SEO and Domain Analysis Tool by DNS Checker. Provides SEO Report, Meta Redirects and 404s, Client IP, Domain IP & Geo Location, etc
Google Rank Checker,Keyword SERP Ranking Tool
Google Rank Checker, Keyword SERP Rankings Tool with CSV Export and Copy to Clipboard Functionality.
Website Ranking and SEO Checker by Semalt
Semalt SEO Extension is a free SEO tool to track websites’ Google rankings and spot issues that keep you from attracting traffic.
Broken Link Checker
A SEO tool to find broken (404) and redirected (301, 307, 308) links in all frames