The short answer
The best Chrome extensions for marketing cover three jobs. For SEO, try SEOquake, Similarweb or Detailed SEO. For YouTube, vidIQ or TubeBuddy. For outreach, Hunter or Apollo.io. Every pick below had 600,000 or more users on 3 Oct 2026, and the ratings show where the bigger samples are.
- vidIQ led our marketing list with 4M users.
- Hunter had 12,514 ratings, the deepest sample here.
- Detailed SEO rated 4.91, but from only 234 ratings.
- MozBar's 3.32 is the outlier in a field of 4.2 and up.
The best Chrome extensions for marketing work like a pocketknife. Each blade does one thing. You carry the ones you use, and the corkscrew you opened once at a picnic in 2019 can stay in the drawer with the others.
The best Chrome extensions for marketing
Counts follow our Chrome extension market research method, with each number dated.
| Extension | Job | Users | Rating (count) |
|---|---|---|---|
| vidIQ Vision for YouTube | YouTube growth | 4,000,000 | 4.50 (11,276) |
| Wappalyzer | See a site's tech stack | 3,000,000 | 4.55 (1,973) |
| Keywords Everywhere | Search volumes in Google | 1,000,000 | 4.51 (5,694) |
| TubeBuddy | YouTube growth | 1,000,000 | 4.46 (8,542) |
| SEOquake | On-page SEO | 1,000,000 | 4.46 (2,641) |
| Similarweb | Site traffic estimates | 1,000,000 | 4.64 (3,803) |
| Apollo.io | Contact finder | 1,000,000 | 4.70 (2,186) |
| Hunter | Email finder | 600,000 | 4.72 (12,514) |
| Detailed SEO Extension | On-page SEO | 600,000 | 4.91 (234) |
SEO checks
SEOquake comes from Semrush, and Detailed SEO comes from Ahrefs. Both show titles, headings and links on any page.
The ratings tell different stories, though. Detailed SEO's 4.91 comes from 234 people. SEOquake's 4.46 comes from 2,641. A smaller sample swings more, so treat a sky-high score from a few hundred ratings as promising, not settled.
Similarweb gives traffic estimates for any site you visit, which is handy when a client swears their main competitor is "tiny" and you want a rough second opinion before the next planning call.
They're estimates, so use them to compare sites, not to quote exact visits.
For current numbers, open the SEO extensions page.
YouTube
vidIQ shows 4,000,000 users, four times TubeBuddy's 1,000,000. Both rate around 4.5. Try both on one video.
Keep the one whose panel you actually read after a week, because a sidebar full of scores you scroll past every upload helps nobody grow a channel.
Outreach
Hunter and Apollo.io find work emails from a company domain or a LinkedIn page. Hunter's rating rests on about six times as many reviews. For more sales tools, see the best Chrome extensions for business.
Verify an email before sending, whichever tool found it.
For AI writing help, see the best AI Chrome extensions.
Paid or free
Keywords Everywhere runs on credits you buy on its site. The Ahrefs and Semrush tools show more data with a paid account. The store listing rarely says so, because the Chrome Web Store doesn't take payments (see Google's developer docs).
Where Ext Watch fits
We're biased, so weigh this lightly. Ext Watch records these tools day by day, so you can see when a competitor ships an update. The extension lookup shows each rival's users, rating and update date in one place.
Pick one blade per job and leave the rest in the drawer.
Questions people ask
What is the best free Chrome extension for SEO?
SEOquake and Detailed SEO both show on-page basics without a paid account. Check each vendor for current limits.
Is vidIQ or TubeBuddy better?
vidIQ had more users on 3 Oct 2026, and both rated about 4.5. Try each on your own channel.
Are traffic numbers from Similarweb accurate?
They're modelled estimates. Use them to compare sites rather than as exact counts.
Where these numbers come from
- keywordseverywhere.comKeywords Everywhere pricingAccessed 3 Oct 2026
- developer.chrome.comChrome Web Store developer documentationAccessed 3 Oct 2026
Part of our guide: Chrome Extension Market Research: A Step-by-Step Method. More in Market research.
745 extensions tracked in SEO extensions. See them all.
Users, ratings and new launches per niche, from our own crawl. Updated 3 Oct 2026 from our Chrome Web Store crawl
