Similarweb

What it is

Similarweb is a world-leading AI-powered digital intelligence platform, covering millions of websites and apps. It provides multidimensional insights into traffic analytics, user behavior, and market trends, helping businesses quickly access authoritative data for market research, competitor analysis, and strategic decision-making.

Mostly for sizing up competitors, not measuring your own site

People open Similarweb to look at someone else's website: roughly how much traffic it gets, where that traffic comes from, and which referrers, keywords and channels bring it in. Agencies use it to size up a prospect before a pitch. SEO and affiliate people use it to decide which sites are worth going after. Online sellers use it to see where a rival's shoppers come from. Every number in it is a modelled estimate, not a reading from the site's own analytics. Use it to see direction and to compare sites, and don't use it to argue over exact figures.

The use that is growing fastest in 2026 is AI discovery: how chatbots and AI search send people to websites and ads. Most of what Similarweb has announced this year is aimed at that.

What changed since spring

April 2026: Adobe completed its purchase of Semrush, Similarweb's closest rival for traffic and SEO research. That rival now sits inside a much larger marketing suite, so check Semrush's plans again before you commit to either one.

May 2026: Similarweb expanded its partnership with Manus, adding keyword, referral and landing-page data for AI agents. June 2026: a collaboration with Perplexity put Similarweb data inside Perplexity Computer through an MCP connector.

August 2026: a new AI Ads dataset tracks ads shown in ChatGPT, Google AI Mode and AI Overviews. The announcement doesn't say which plans include it, so don't assume a Standard plan does.

September 2026: Similarweb named Michael Akkerman as CEO, starting November 2026, with founder Or Offer staying on through a transition. The company hasn't announced any plan changes, but a new CEO is a good reason to watch for them.

A shared seat is fine for occasional checks, not for running a business

Be clear about the rules. Similarweb's terms only allow named users from the subscribing organisation, forbid anyone else from using the platform, and let Similarweb end a subscription for a breach without notice. A shared plan can conflict with those terms. If access is cut, it can go mid-month, and your complaint is with the seller, not with Similarweb.

A shared plan suits a freelancer, student or founder who checks a few competitors now and then, and for whom losing access would be an annoyance, not a crisis. Pay for your own account if you deliver client reports, need exports or API access, handle confidential research, or need to stay within Similarweb's terms. Only a direct subscription does that.

Before you buy

Write down the three or four questions you actually need answered, then confirm the shared plan includes the sections that answer them. Newer AI and retail data may not be included.

Ask the seller what happens if access stops: whether they replace it or refund you, and how quickly.

Treat the account as public. Don't save client lists or sensitive searches in it. Export what you need to your own files.

Test accuracy first: compare Similarweb's free estimates for a site you own with your real analytics, to see how far off it is in your niche.

Adobe Completes Semrush Acquisition · Similarweb and Manus Expand Data Coverage, Enabling Deeper Digital Marketing Insights and Smarter AI Agents · Similarweb Expands AI Ecosystem with Perplexity Collaboration Through Native AI Workflows · Similarweb Unlocks the Black Box of AI Ad Placements Across ChatGPT, Google AI Overviews, and AI Mode · Similarweb Names Michael Akkerman as New Chief Executive Officer

2026-09-29