Semust API

Semust API is a REST-based search and SEO service aimed at content creators, marketers, and teams building organic-search workflows. Its strongest case is combining detailed Google result data with keyword research and a wider SEO workspace; the trade-off is usage quotas that can constrain larger or highly automated programs.

Overview

Semust’s SERP endpoint delivers current Google result information across organic listings, advertisements, People Also Ask boxes, AI Overviews, image results, and Knowledge Panels. A separate Keyword Research API returns search volume, keyword difficulty, cost per click, search intent, and related terms from one endpoint. That combination is useful when an application needs to understand both what appears in search and how a query behaves as a keyword.

The API uses REST and authenticates with SEMUST-API-USER and SEMUST-API-PASSWORD HTTP headers. Semust’s wider product adds rank tracking, technical SEO checks, backlink analysis, AI content generation, internal linking, and reporting. Integrations include Google Search Console, Google Ads, Google Analytics, Meta Ads, WordPress, Bing Webmaster, and Yandex Metrica. The platform is made in Türkiye and was founded by Ramazan Umutlu, who the company says has more than a decade of full-time SEO experience.

Key features

Search, keyword, and site intelligence

Alongside SERP and keyword endpoints, Semust provides ranking, backlink, domain, and historical data. Its paid technical SEO scans cover up to 20,000 URLs, giving small and mid-sized sites room for substantial audits. Support for articles and entire sites makes the service relevant to both content-level work and broader domain programs.

Browser tooling and connections

The free Semust SEO Toolbar extension adds practical page checks: it displays a page outline, verifies HTTP status codes for links, and inspects JSON-LD. Connections to major analytics, advertising, webmaster, and publishing products can reduce the need to move data manually between systems. These extras matter most to users who want an end-to-end SEO process rather than an isolated API.

Pricing

Semust has a 14-day Free plan with no credit card requirement. It includes 100 AI credits, 15 uses each for keyword search, backlink analysis, SERP analysis, and competitor analysis, 10 rank-tracking units, and one project. Those caps make it suitable for a short evaluation or a very small site, not sustained production volume.

Starter costs $19 a month, billed monthly. It provides 1,750 AI credits, 100 keyword searches, 250 rank-tracking units, and five projects. This is the sensible entry point for an individual or small operation, although the plan does not include a stated team seat.

Business is $35 a month, billed monthly. The allowance rises to 3,250 AI credits, 250 keyword searches, 500 rank-tracking units, and 10 projects, with one team seat. It fits a small SEO team that needs shared access and more recurring research.

Enterprise costs $59 a month, billed monthly. It raises usage to 5,400 AI credits, 500 keyword searches, 1,000 rank-tracking units, and 40 projects, and includes three team seats. This is better suited to agencies or organizations managing many properties.

Scale is $129 a month, billed monthly. Its 18,000 AI credits, 1,250 keyword searches, 2,000 rank-tracking units, 100 projects, and five team seats target high-volume programs. Across paid tiers, the 20,000-URL technical-scan ceiling remains relevant when auditing very large sites.

Platforms

Semust is offered through an API, web application, and Chrome extension. The REST format suits server-side integrations, while the web interface and toolbar cover analysts working directly in browser-based SEO workflows.

Who it's for

Choose Semust if you are growing organic traffic, producing content, or operating an SEO team that benefits from one place for search data, tracking, audits, backlinks, and reporting. The Free plan is primarily an evaluation window; ongoing users should match their project count and monthly credits to expected volume. A developer needing only raw SERP responses may find the broader subscription structure more than necessary.

Pros and cons

• Pro: SERP coverage includes AI Overviews, ads, People Also Ask, images, and Knowledge Panels, not just standard organic results.
• Pro: One keyword endpoint combines volume, difficulty, CPC, intent, and related suggestions.
• Pro: Paid plans support up to 20,000-URL technical scans and include historical, backlink, domain, and ranking data.
• Con: The 14-day free access has low activity caps and only one project, limiting extended evaluation.
• Con: Monthly quotas for AI credits, keyword searches, and rank tracking require careful plan selection as usage grows.
• Con: The cheapest paid tier has no stated team seat, making collaboration a reason to move to Business.

Alternatives

Consider Semrush if you prefer a long-established SEO option with a free tier offering one demo project and 10 reports per day, while its SEO plan costs $117.33 per month.

ovoSEO is a better fit for a lower-cost, focused site workflow: its free plan lasts forever for one website and includes a checklist, roadmap, basic audit, and Google connections, with Pro at €9.99 a month.

Pick Rankerli when unlimited connected Search Console properties and free projects are more important than Semust’s broader API toolkit. SEO A/B Tester is for a single free SEO experiment, while SERP Split is a free SEO testing tool with no paid plan stated. Statsig suits product experimentation across web, mobile, and API environments rather than SEO-specific research. Optux AI focuses on A/B testing and AI text personalization. SERPclimber is worth considering for Search Console-centered work with a free tier and a $99.00 monthly Pro plan.

Verdict

Semust API is a strong choice for creators and SEO teams that want broad Google search extraction plus keyword, ranking, backlink, audit, and content capabilities in one service. Choose it for that integrated scope and the accessible $19.00 monthly starting tier; look elsewhere if your workload needs much larger quotas, unlimited experimentation, or only a narrowly focused endpoint.