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Semrush

Free tier

The leading platform to grow and measure brand visibility across every digital channel

Free tier available·All audiences·API available
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Key strengths

Industry's largest backlink database with 43 trillion linksUnified SEO + AI visibility tracking across LLMs like ChatGPT28 billion keyword database across 142 geo databasesEnd-to-end marketing suite: SEO, content, ads, social, PR, and localEnterprise-grade competitive intelligence and market analytics
Free tier + paid plans
Boston, USA
Founded 2008
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Semrush is a SaaS platform built on proprietary data infrastructure encompassing 28 billion keywords, 43 trillion backlinks, and 808 million domain profiles across 142 geographic databases. It exposes this data via a well-documented REST API, enabling developers to programmatically access keyword research, backlink analytics, domain analytics, and traffic estimation data.

The platform integrates with major ecosystems including Google Ads, Meta Ads, ChatGPT, and Lovable, and offers an App Center for third-party extensions. The AI Visibility Toolkit tracks over 261 million LLM prompts to measure brand citation share-of-voice in AI-generated responses, providing structured competitive intelligence that goes beyond traditional SERP ranking data.