As of this June 2026 edition (April 2026 data), ChatGPT is the AI chatbot market share leader, at about 54.7% of worldwide web visits across the seven largest generative AI chatbots, ahead of Google Gemini (27.4%) and Anthropic's Claude (8.2%). In this report, "market share" means web-visit share: each assistant's portion of measured web traffic across a defined seven-app set, as estimated by Similarweb. The report ranks every major AI chatbot by web traffic, charts the 15-month trend, breaks out United States share, reports growth and engagement, and states the measurement method in full.
Key takeaways
- ChatGPT is the most-visited AI chatbot in 2026, at about 54.7% worldwide web-visit share across the seven leading assistants (April 2026, Similarweb).
- Google Gemini is second, at 27.4% worldwide web-visit share, roughly half of ChatGPT's web visits, and it is the fastest-scaling large assistant, up about 104% in six months.
- Claude is the fastest-growing major AI chatbot by web visits, up about 306% in a single quarter (203M in January to 824M in April 2026), off a small base.
- In the United States, ChatGPT's web-visit share is higher, at 58.9%, with Gemini at 19.2% and Claude at 12.5%.
- ChatGPT's web-visit share fell from about 76.5% in February 2025 to 54.7% in April 2026, while Gemini's rose from about 5.6% to 27.4%.
- DeepSeek (4.1%) and Grok (2.8%) are larger by worldwide web traffic than most rankings report. Perplexity (1.5%) and the standalone Microsoft Copilot web app (1.3%) are smaller.
- Web visits exclude mobile apps, embedded surfaces, and API usage, so this ranking measures the consumer web product rather than total model usage.
Which AI chatbot has the largest market share in 2026?
ChatGPT has the largest AI chatbot web-visit share in 2026, at about 54.7% of worldwide web visits among the seven largest generative AI chatbots in April 2026. The seven apps drew a combined 10.07 billion web visits that month. The market is two-tiered. ChatGPT and Google Gemini together hold about 82% of measured visits, and the other five assistants split roughly 18%.
Source: Similarweb, total (desktop and mobile web) visits, worldwide, April 2026. Shares are each app's visits as a percentage of the seven-app total and may not sum to 100% because of rounding.
Which apps are counted, and which are not
The set is standalone, general-purpose generative AI assistants on a separable primary web domain above roughly 50M monthly web visits. It covers the large assistants in English-language markets. It excludes assistants with no separable domain (for example, Meta AI inside Meta's apps), companion and character apps (for example, Character.AI), answer aggregators (for example, Poe), and major non-English assistants, including Chinese models such as Doubao, Ernie, and Qwen. Adding any of these would lower every share figure, most visibly in the long tail at positions 4 to 7. Read the lower positions as shares of this defined set, not of all AI chatbot usage worldwide.
What is the AI chatbot market share in the United States?
In the United States, ChatGPT holds about 58.9% of AI chatbot web-visit share, ahead of Google Gemini (19.2%) and Claude (12.5%), based on April 2026 Similarweb data. The US market is more concentrated at the top than the worldwide market, and it re-weights the challengers. Gemini's US share is lower than its worldwide share, because its strongest markets are in Asia and Latin America. Claude's US share is higher, because its usage is the most US-centric of the leaders.
Source: Similarweb, total web visits, United States, April 2026. US quarterly growth compares April 2026 with January 2026. Shares may not sum to 100% because of rounding. Worldwide and US growth are not directly comparable, because the base and geography differ.
How has AI chatbot market share changed over time?
AI chatbot web-visit share has consolidated toward Google Gemini and away from ChatGPT over the 15 months to April 2026. ChatGPT's share of the seven-app set fell from about 76.5% in February 2025 to 54.7% in April 2026, while Gemini's rose from about 5.6% to 27.4%. The series below is share of the seven-app set at quarterly snapshots. Similarweb coverage for these domains begins in February 2025, so earlier figures are not asserted here.
Source: Similarweb, total worldwide web visits; share of the seven-app set at each snapshot. Columns may not sum to 100% because of rounding.
A few patterns stand out. ChatGPT's decline is gradual and recent: it held roughly 76 to 79% through mid-2025 before sliding through 2026 as challengers grew. DeepSeek's February 2025 figure (12.0%) reflects its launch-driven traffic spike, which faded over the following months. Claude's rise is the steepest late move, from about 2% through most of 2025 to 8.2% by April 2026.
How do ChatGPT, Gemini, and Claude compare?
ChatGPT, Gemini, and Claude are the three largest AI chatbots by web traffic, and each leads on a different dimension. ChatGPT leads on size, Gemini on sustained momentum among the large assistants, and Claude on growth rate and engagement quality.
Source: Similarweb, April 2026.
Is ChatGPT losing market share?
ChatGPT is losing web-visit share slowly while staying dominant. Its worldwide web visits were roughly flat over the six months to April 2026 (about -6% versus November 2025) even as the overall market grew, so challengers absorbed most of the market's growth. ChatGPT still serves more web visits than the other six assistants combined. The pattern is a gradual erosion of share rather than a sharp drop: a dominant leader whose share slips because Gemini and Claude grow faster.
Is Google Gemini overtaking ChatGPT?
Google Gemini is closing the gap but has not overtaken ChatGPT. Gemini is the second-largest AI chatbot at about 27.4% worldwide web-visit share, roughly half of ChatGPT's traffic (2.76B versus 5.51B visits in April 2026), and it more than doubled its web visits over six months (1.35B in November 2025 to 2.76B in April 2026, up 104%). Combined with Google's distribution across Android, Chrome, and Search, Gemini is the main competitive threat to ChatGPT's lead, though it would need to roughly double again to draw level on web traffic. One caveat applies to interpretation. Some of Gemini's measured web visits are likely driven by Google entry points such as the Google app, Search, Android, and Workspace, rather than by independent demand, which can flatter both its share and its growth against a destination users navigate to directly.
How fast is Claude growing in 2026?
Claude is the fastest-growing major AI chatbot by web visits in 2026, up about 306% in a single quarter (203M in January 2026 to 824M in April 2026) and about 357% over six months (180M in November 2025 to 824M in April 2026). This is the largest growth rate in the set, and it moves Claude from a niche, developer-associated tool to the third-largest consumer AI chatbot by web traffic. The figure is a percentage off a small base, so it reflects rapid scaling rather than parity with the leaders. In the United States, Claude's quarterly growth is about 251%.
Which AI chatbot is growing the fastest in 2026?
Ranked by quarterly web-visit growth (April 2026 versus January 2026), Claude is the fastest-growing AI chatbot, followed by DeepSeek and Gemini. ChatGPT, Perplexity, and Grok declined quarter-over-quarter.
Source: Similarweb, worldwide total web visits.
Quarterly and six-month growth diverge for DeepSeek, Grok, and Microsoft Copilot because their traffic is non-monotonic, a dip then recovery or a spike then fade. Read a single growth figure as the net change between two dates, not as a steady rate.
Which AI chatbots have the highest user engagement?
By April 2026 engagement metrics, Grok and Gemini show the highest per-visit engagement and Microsoft Copilot's standalone web app the lowest. Claude shows the best engagement-to-traffic ratio among the consumer leaders, with a 26% bounce rate, the lowest in the set, and 4.34 pages per visit despite ranking third in volume.
Source: Similarweb, total worldwide web traffic, April 2026.
Grok's figures are outliers, at roughly 11-minute sessions and about 13 pages per visit, likely because the grok.com surface bundles activity beyond chat and is entangled with adjacent X (formerly Twitter) properties. Treat both its engagement and its visit counts as directional. Microsoft Copilot's weak web engagement (48% bounce) fits a standalone web domain that is not where its value is delivered.
Where are AI chatbots used the most, by country?
The United States is the single largest country for every leading assistant: about 18.5% of ChatGPT's April 2026 web visits, 12.1% of Gemini's, and 26.3% of Claude's. No leader draws a majority from any one country, so AI chatbot usage is spread across many markets.
Source: Similarweb, share of each app's own total web visits by country, April 2026.
Claude is the most US-concentrated of the three leaders. Gemini is the most internationally distributed, with strong East Asian usage. DeepSeek's base is heavily Asian, which is why its worldwide share (4.1%) far exceeds its US share (1.1%).
AI chatbot market share by users vs. web visits
AI chatbot market share measured by users, app downloads, or revenue would rank the field differently from web visits, and no single public source measures those consistently. Reported monthly-active-user counts come from company announcements on different definitions and dates. Mobile app-store rankings order the same apps differently, because app usage is not web usage. Revenue share is dominated by API and enterprise contracts that no consumer-usage metric captures. This report uses web visits because it is one defined, reproducible quantity that can be re-pulled and audited. Where a question is specifically about users or revenue, read web-visit share as a proxy for consumer web demand.
How is AI chatbot market share measured?
AI chatbot market share in this report is measured as web-visit share: each assistant's monthly sessions on its primary web domain, estimated by Similarweb, expressed as a percentage of the seven-app total. Web visits were chosen because they are one defined, reproducible quantity. A "users" figure requires undisclosed deduplication assumptions, and a "share" with no denominator is not a measurement. The window is April 2026, the latest complete month. The trend uses snapshots back to February 2025, the earliest month Similarweb covers these domains. Quarterly growth compares January 2026, and six-month growth compares November 2025. Figures are worldwide unless a country is named. Estimates are panel-modeled, carry an error band rather than decimal precision, and are revised month to month, so single percentages are best read as approximate.
Why do AI chatbot market share reports disagree?
AI chatbot market share reports disagree mainly because they measure different things without disclosing it. Four methodology gaps drive most discrepancies:
- No stated denominator. A "share" figure given without specifying users, sessions, visits, or revenue cannot be reconciled with any measured quantity.
- Undisclosed geographic scope. A US-only ranking inflates US-concentrated apps such as Claude and understates Asia-heavy apps such as DeepSeek; a worldwide ranking does the reverse.
- Internal inconsistency. A report that shows one headline share and a contradictory figure in its own trend data is publishing an estimate rather than a measurement.
- Stale product data. Listings that attribute outdated or incorrect underlying models to an app show a dataset that is not maintained against the live market.
The corrective is disclosure rather than a better black-box number. A ranking is only as credible as the methodology a reader can inspect.
Does web traffic capture total AI chatbot usage?
No. Web traffic understates total AI chatbot usage, and it does so unevenly across apps. Web visits measure the consumer web product, not total model usage or revenue. Four categories sit outside, or distort, web-visit data:
- Native mobile apps. ChatGPT, Gemini, Claude, Perplexity, Grok, and DeepSeek all have large iOS and Android apps whose usage does not appear in web visits.
- Embedded and ambient surfaces. Most Microsoft Copilot usage occurs inside Windows, Edge, Bing, and Microsoft 365, so its 1.3% web-visit share understates its true reach. Gemini is similarly embedded across the Google app, Android, and Workspace, and entry points from those products may inflate its measured web visits.
- API and enterprise consumption. A large share of OpenAI's and Anthropic's token volume runs through APIs that generate no web visit.
- Automated traffic. Panel-and-model estimates can include non-human traffic, and AI domains are common automation targets, which adds noise to any single-month figure.
This is the most reproducible public view of the consumer market, and it is not offered as a measure of total usage.
What does AI chatbot market share mean for brands and AI search visibility?
For brands, AI chatbot market share shows where to monitor AI search visibility, which is a different question from where a brand is already cited. ChatGPT and Gemini holding about 82% of consumer web traffic means those two surfaces shape most AI-mediated brand impressions, so monitoring should concentrate there. Whether a brand appears in those answers depends on other signals: being indexed and ranking on Google, which feeds Gemini and AI Overviews, and being present on the third-party sources these systems ground on, such as review platforms, community threads, and structured listings.
Two mechanics follow. First, generative assistants present the most-published consensus about a topic as fact, which turns search, PR, and social into a single input to one machine-generated consensus instead of three separate channels. Second, as users hand more of the consideration stage to assistants, being inside an assistant's consideration set matters more than ranking on a page a person may never open. One caveat: AI-search visibility measurement is directional rather than measurement-grade, because assistant answers are non-deterministic, no public dataset of real prompts exists, and roughly 80% of prompts are unique. Track it at the topic level as a trend, and report usage-share data like this report as the defined quantity it is, while treating share of voice inside AI answers as an estimate.
Frequently asked questions
What is the most popular AI chatbot in 2026? By web visits, ChatGPT is the most-used AI chatbot in 2026, at about 54.7% of worldwide web-visit share and 5.51 billion web visits in April 2026.
Which is bigger, Gemini or Claude? Google Gemini is bigger. Gemini had 27.4% worldwide web-visit share (2.76B visits) versus Claude's 8.2% (824M visits) in April 2026, more than three times larger by web traffic.
Is Gemini overtaking ChatGPT? Not yet. Gemini reached 27.4% worldwide web-visit share in April 2026 against ChatGPT's 54.7%, about half. Gemini's share rose from about 5.6% in February 2025 while ChatGPT's fell from about 76.5%.
What is ChatGPT's market share in the United States? ChatGPT held about 58.9% of US AI chatbot web-visit share in April 2026, ahead of Gemini (19.2%) and Claude (12.5%).
Which AI chatbot is growing the fastest? Claude is growing the fastest, up about 306% in worldwide web visits in the quarter ending April 2026.
How has ChatGPT's market share changed since early 2025? ChatGPT's share of the seven-app set fell from about 76.5% in February 2025 to 54.7% in April 2026, while Gemini's rose from about 5.6% to 27.4%.
Is DeepSeek popular outside its home market? DeepSeek held about 4.1% of worldwide AI chatbot web visits in April 2026 but only 1.1% in the United States, which reflects a heavily Asian user base.
Is Perplexity gaining or losing share? Perplexity is losing web-visit share, down about 18% over the six months to April 2026, to roughly 1.5% worldwide.
How often is this report updated? Monthly, using the latest complete month of Similarweb data.
Methodology and data sources
- Metric: web visits (a session on the app's primary web domain), and visit-derived web-visit share within a defined seven-app set.
- Source: Similarweb, total = desktop and mobile web.
- Window: April 2026 (latest complete month). Trend snapshots run February 2025 (earliest Similarweb coverage for these domains) through April 2026. Quarterly growth compares January 2026; six-month growth compares November 2025.
- Scope: worldwide headline, plus a United States table, a 15-month trend, and per-country breakdowns for the top three apps.
- Inclusion rule: standalone, general-purpose generative AI assistants on a separable primary web domain above roughly 50M monthly web visits.
- Excluded apps: assistants without a separable domain (for example, Meta AI), companion and character apps (for example, Character.AI), aggregators (for example, Poe), major non-English assistants (for example, Doubao, Ernie, Qwen), and small standalone apps (Brave Leo, Komo, Andi).
- Known limits: web visits exclude native apps, embedded surfaces, and API or enterprise usage; some apps' web visits may be inflated by ecosystem entry points; estimates are panel-modeled, carry error bands, and are revised monthly; assistant model versions change often and are not asserted here.
- Cadence: monthly.
