Successfully marketing a website can be a tricky endeavor. That is why Search Engine Optimization (SEO) tools are available to give websites greater visibility. Search Engines use several avenues for populating search engine results pages (SERP), and website developers want to make sure they follow the optimization guidelines for the best page rank results. Tools are available for choosing the correct keywords, creating high-level content, formatting content, responsive design, backlinks, localization, search engine marketing (SEM), page rank, and other SEO essentials. These tools are often accessible by APIs.

An SEO API is an Application Programming Interface that enables developers to add SEO features to applications. SEO APIs can connect developers to data and functionality found in SEO tools.

The best place to find these SEO APIs is in the SEO category. In this article, we highlight ten popular ones, based on reader interest.

1. Google PageSpeed Insights API

The Google PageSpeed Insights APITrack this API enables developers to programmatically measure the performance of a web page and get suggestions for how to improve that page's performance, accessibility, and SEO. This API returns data from the Chrome User Experience Report and lab data from Lighthouse (Google's open-source, automated tool for improving the quality of web pages).

2. Alexa Top Sites API

Alexa Traffic Rank from Amazon provides competitive analysis services for driving website traffic. The Alexa Top Sites APITrack this API retrieves traffic rankings for lists of 100 websites or more. Data returned includes the number of page views the site receives per million users, the average page views per user, and the number of Alexa users visiting the site. Amazon AWS account registered users can get access to the API.

3. SEO Content Analysis API

SEO Review Tools provides SEO insight tools. The SEO Content Analysis APITrack this API allows developers to access real-time SEO insights and analysis form a submitted web page URL or raw HTML. Data returned includes keyword stuffing detection, title tag analysis, meta description analysis, URL input analysis, content length analysis and more. This API enables developers to analyze both published and unpublished content, and is updated frequently based on the latest developments in web searching.

4. Zara 4 API

Zara 4 is an image compression Platform. It can be used to optimize an existing website or for SEO purposes. Zara 4 REST APITrack this API is available with a very limited free plan or with prices for higher limits. The Zara 4 API is listed under the Images category.

5. BrightEdge API

BrightEdge is an SEO service for the web, mobiles, and tablets, offering multiple features and tools. The BrightEdge APITrack this API allows developers to access and integrate the data of BrightEdge with other applications. Interested developers need to request access.

6. GeoRanker Rank Tracking API

The GeoRanker Rank Tracking APITrack this API returns SEO data, keywords, and organic searches in real time. With the API, developers can create up to 1000 SERP requests plus manage SERP data. The API supports all search engines and locations

7. Serpstat API

Serpstat is a Web development company that focuses on SEO and analytics. The Serpstat platform is used for competitor analysis and keyword research. Metrics can be pulled from the Serpstat servers via the Serpstat APITrack this API.

8. Mozscape REST API

Moz is an analytics software for search, links, and brand. Moz has a large index of URLs from around the web that might be of benefit to marketers. With the Mozscape APITrack this API, developers will be able to customize and integrate data from its index into their applications.

9. Website Worth API

Siteprice is an SEO company that offers the Website Worth APITrack this API to check website and domain worth, find information like page rank, search engine visibility, estimated visitors count, social media statistics, estimated visitors count, advertisement income and hosting provider.

10. SEO Explorer API

SEO Explorer provides marketing and search engine optimization tools including keyword search, backlink research, URL classification and more. The SEO Explorer REST APITrack this API enables developers to retrieve SEO information associated with a domain, keyword or backlink. The API returns unique links, links to homepage, domain score, and main organic competitors.

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