aherf tool. Many actors and factors were responsible for AHERF's demise. aherf tool

 
 Many actors and factors were responsible for AHERF's demiseaherf tool  Here at Ahrefs, we have a website authority metric of our own called Domain Rating

3 billion bankruptcy of the Allegheny Health, Education, and Research Foundation (AHERF) in July 1998 was the nation's largest nonprofit health care failure. See all your competitor’s backlinks. If you have a paid subscription with Ahrefs, you also get SEO metrics for the pages you visit and for the SERP results (with export). Increase your website’s traffic with the industry’s favorite SEO tool. ABSTRACT: The $1. We build products that are both meaningful and easy to use, and move fast to give our customers what matters. 1. Depending on the DR checker you are using, such as the Ahrefs domain rating checker, the score of the typical domain authority falls somewhere between 1 and 100. Keyword Search Volume and Keyword Difficulty are not. No, I don't use this. Ahrefs Webmaster Tools. Once uploaded, you can check if it was done correctly. Moving on to AWT’s other tool, let’s look at Site Explorer, which gives you a high-level view of your website’s backlink profile throughout various reports. . It’s called Ahrefs Webmaster Tools. Ahrefs’ Blog Title Generator can be a valuable tool for bloggers and content writers looking to brainstorm captivating and attention-grabbing titles for their articles. number of backlinks. to pave the way towards development and deployment of Exosome based diagnostics by providing clinicians a non-invasive tool for prognosis,. Reviewers felt that Ahrefs meets the needs of their business better than Similarweb. Apollo Hospitals Educational & Research Foundation (AHERF) is a not-for-profit registered organisation established in the year 1992. However, detailed information of AP2/ERF genes in peanut against drought has not yet been performed. JavaScript Yes, I use this too. In comparison, Google Keyword Planner's Search Volume estimates were roughly accurate in 45% of cases. To get Ahrefs Webmaster Tools for free, you need to meet only one condition – be the owner of the site to which Ahrefs Webmaster Tools will be assigned or have access to a verified Google Search Console. JavaScript is the programming language of HTML and the Web. [ 3 ]Ahrefs website audit results. Ahrefs Free SEO Tools: As we already know, Ahrefs has stopped its free trial, but still it offers a collection of free tools. Ahrefs Group Buy tool Pricing. Ahrefs Webmaster Tools lets you use both the Overview and Overview 2. The keywords that at least x of your competitors rank for. Digital marketer| SEO|SEM|SMM| Marketing Research Report this post Report Report1: Get a super useful SEO overview of your website. Step 2: Results analysis. Their product quality, in-depth blog guides, YouTube tutorials, and 24/7 customer support are good enough to choose Ahrefs over any other alternative keyword research tool. Ahrefs Cookies | Get Free Ahrefs Premium Accounts. Two purchase agreements filed in Common Pleas Court showed that PCPs received $70, 000 -$150, 000 for their assets, an average annual salary of $220, 000 -$250, 000 for five years, and 60 percent. Chính vì vậy, nhiều hội nhóm mua chung Ahrefs đã được lập ra và. Ahrefs builds online SEO tools and creates free learning materials that help millions of website owners around the globe to get more traffic from search engines. While its interface isn't geared for beginners, it's a solid. Therefore we have developed a platform, Group Buy SEO Tools, where multiple users can share the. You can also see view historical backlinks via. ". Ahrefs used to have a straightforward pricing model: if you signed up to Lite, you got featured in Lite. For a more in depth. 3 billion in debt and 65,000 creditors. New to Ahrefs or feeling a little lost? Start here ;) By Helen and 7 others22 articles. . Competition Analysis, Ranking Report Creation, Google Analytics Set Up & Report Creation. Ahrefs’ Site Explorer tool helps you analyze your site’s backlinks. Fill your content calendar for weeks, months, or even years in minutes. In fact, my list of Ahrefs alternatives mentions quite a few of those rank trackers since it's one of the tools a lot of people turn to Ahrefs to use. 5. Ahrefs shows you the complete picture of followed vs nofollowed links for any target. . Given that we have nearly 100 million keywords in our US Amazon database alone, this usually results in hundreds or thousands of keyword ideas. For over 10 years now, Ahrefs has been crawling the web, storing and processing petabytes of data and fine-tuning a simple, intuitive user interface. Digital marketer| SEO|SEM|SMM| Marketing Research Report this post Report ReportOur study revealed that Ahrefs' Search Volume estimates were roughly accurate for 60% of the studied keywords compared to "Impressions" from Google Search Console. You can do the free trial for each one and see which you like the best. Use SEO tools like Ahrefs “Content Explorer” or Ahrefs site audit to run a backlinks research, and make sure how many backlink opportunities you will need to find to rank for the target keyword. On July 21, 1998, the nonprofit Allegheny Health, Education, and Research Foundation (AHERF) filed for bankruptcy, with $1. Here are the links we do our. Find out how SEO can work for you. In Google Keyword Planner (which is the primary source of this data), they call it “Avg. All Collections. That’s a lot of keyword data. Similar to domain authority Domain rating shows the strength of the website on search engines. When you first start using Ahrefs, it’s easy to get caught up in checking rankings and keywords, but it’s also important to note that your website could be at risk if you have poor DR scores. Before I get into the nitty-gritty of the Ahrefs SEO Toolbar, let me tell you something that might make you want to grab this free extension right away. Note: You can also click on Import and Sign in with the google search console account. The most complete keyword research tool on the market. Click on the “Extensions” tab, then click on “More Extensions” to open the Safari extensions page in the Apple App store, search for the Ahrefs SEO Toolbar and click “Get” to download it. Ahrefs has been the number one tool in our SEO tool belt for many years. 55. So, if you are looking for an SEO tool primarily targeting link building, Ahrefs is the best choice to go. Providing it with a seed keyword, it gives you a list of synonyms and related terms, alongside their volume. Ahrefs is a professional-grade SEO tool with powerful features across everything from keyword management to competitive analysis. Khi nói đến SEO, là nói đến cuộc chơi giữa seoer và Google. We would like to show you a description here but the site won’t allow us. Details Guide on Ahrefs Webmaster Tools (AWT) Conclusion. You don't have to be an SEO pro to rank higher and get more traffic. If you pay monthly, Ahrefs ranges from $99 all the way up to $999. WordStream’s software and services, including our award-winning Google Ads Performance Grader, help businesses and agencies take the guesswork out of pay-per-click advertising so you. 00 for each 7 days Jasper 10k,words. Get more traffic with Ahrefs' free SEO tools: Webmaster Tools, Keyword Generator, Backlink Checker, SEO Toolbar, and more. This is by far the most powerful domain age checking tool you'll find on the web because it is loaded with vital domain name checking features. Content optimization is the process of improving content to ensure it stands the best possible chance of meeting its desired goal. Duplicate content. This will add the new keywords to the existing list of tracked keywords, and Ahrefs will start reporting on movements for those keywords as well. However, you need an active paid account at ahrefs. Domain Rating. What is SEO Checker? SEO Checker is not a standalone tool. Hydrogen Electric Racing Federation (hydrogen fuel cell powered vehicle racing) HERF. With Semrush’s Site Audit tool, you can check for link issues at scale. Nikhil Dambhare (Seo Expert)Seasoned professional with 4 years of experience in SEO,Keyword Analysis,Search Engine Submission,Content Optimization,Website Analysis,off page,on page, webmasters tool, aherf tool,ai tools. However Ahrefs, Semrush,Moz pro and many more offer free trials. 95 when billed monthly or $208. Save BIG w/ (8) Ahrefs verified discount codes & storewide coupon codes. While its interface isn't. The figures extend to 3 trillion external backlinks, and 23 trillion internal links crawled. Prior to the bankruptcy, Coopers Lybrand, L. I tried aherf but was not so impressed. Apollo Hospitals Education and Research Foundation listed as AHERF. By inputting a paragraph into the tool, users can receive a rewritten version that offers improved clarity, structure, and overall quality. Ahrefs black friday sales, promo codes, coupons & deals, November 2023. Checking if the backlink is in the index immediately after you get it is vital. We Guarantee Satisfactory Service. Providing it with a seed keyword, it gives you a list of synonyms and related terms, alongside their volume. Keywords Explorer. Use the interactive graph to see how traffic has progressed both globally and locally in 171 countries. Reveal every keyword for which the target website or web page ranks in the top 100 across 155 countries. Discover keyword ideas, all day long. The AhERF-VII gene has a length of 1022 bp and encodes for a protein of 254 aa with a molecular weight of 28. Ahrefs military & senior discounts, student discounts, reseller codes &. 4 billion of those keywords are for the US alone. Ahrefs Pte. You can filter links by region, anchor text, domain score, page score, and even by URL. Experience of On-Page. Postgraduate Diploma in Clinical Research (PGDCR). Một trong những công cụ đem lại nhiều lợi. El más preciso y completo. For similar tools, I'd be expecting a few thousand tracked keywords, updated daily, but instead, it updates every 5 days and on my plan it only gives 1,500 keywords. 95$/ Month. Với bản Lite của Ahrefs đã là $99/ tháng và giới hạn chức năng. Our crawler is the second most active after Google, and we update our backlinks database with fresh data every 15 minutes. Towards this goal, AHERF has been aggressively pursuing for tie-ups with eminent organizations in a collaborative effort to tap into the rich resource pool within and outside the Apollo group and harness their expertise for clinical and biomedical research. Enter a competitor’s website to see all their backlinks. The Training Attendance Template lets you track the attendance of employees in mandatory and/or voluntary training programs. Templates Interactive documents and spreadsheets to customize for your business's needs. On July 21, 1998, the nonprofit Allegheny Health, Education, and Research Foundation (AHERF) filed for bankruptcy, with $1. What is Ahrefs Used For? Ahrefs is mainly used to analyze a website’s link. if you buy Ahrefs tool only it cost around 299/month. How To Use Aherf Tools, Keyword Research, Search Result, Keyword DifficultySince the Ahrefs WordPress plugin focuses on content audits, it complements other SEO plugins rather than replaces them. It was launched in 2010 by Dmitry Gerasimenko and has since become one of the most popular SEO tools on the market. CPC(USD) Traffic % ahrefs. Go to the Backlinks report. Ahrefs' SERP Checker shows you how much organic search traffic the top results get from all the keywords they rank for. Ahrefs is one of the best tools out there for keyword research and competitor analysis, but many people don’t know about one of its most powerful features – the DR Checker. To do that, Ahrefs crawls the web, stores tons of data and makes it accessible via a simple user interface. "AHERF ultimately sought Chapter 11 protection in July 1998 with about $1. AhrefsIf you're looking for a quick and easy way to pull Ahrefs' backlink metrics for up to 200 individual URLs, Batch Analysis is the tool you're looking for. By Nick and 10 others 11 authors 105 articles. 340. 3 billion debt and 65, 000 creditors. Once you know which pages on the SERPs get the most traffic, you can analyze them in Site Explorer to replicate their success. P. SEMRush offers a tool called Position Tracking. MAJESTIC $15. The higher a website’s Domain Rating (DR), the stronger and more authoritative it is. For larger comparisons, such as analyzing weather. The domain rating SEO matrix is designed by the Aherf SEO tool. میزان رشد لینک‌های رقیبتان را بسنجیدAhrefs Backlink Checker is one of the most powerful analysis tool for backlink checker tools that boosts an extensive link index for storing large data volumes. To do that, Ahrefs crawls the web, stores tons of data and makes it accessible via a simple user interface. Right off the bat, you can see the cumulative backlinks and unique referring domains for your website in Overview 2. New to Ahrefs or feeling a little lost? Start here ;) By Helen and 7 others22 articles. Through our videos, you'll learn how to grow organic traffic on Googl. Custome plan $20. 2). Twelve tools to help identify your best-performing tactics and content, and do more of what works. Moz’s Keyword Difficulty tool is for narrowing down your pool of keywords to the ones you have a shot at ranking for, while Ahref’s Keywords Explorer is for generating new ones. Ahrefs Ahrefs Tutorials, FAQs and best practices with tools like Batch Analysis, Link Intersect, Ahrefs Toolbar etc. We believe that a keyword difficulty of 10 or below. Rounding out the comparison is rank tracking, where Bruce Hogan from SoftwarePundit believes SEMrush reigns supreme. org, the tool is a bit slow. ⚫But don't let the ups and downs discourage…The system was forced to declare bankruptcy in July 1998. Get ranking updates for desktop and mobile. The price of which is $99. The Apollo Hospitals and Educational Research Foundation (AHERF) has been totally. Ahrefs If you're looking for a quick and easy way to pull Ahrefs' backlink metrics for up to 200 individual URLs, Batch Analysis is the tool you're looking for. Keyword research is an essential part of any online marketing campaign, whether you’re writing an article to promote your business or simply trying to get more views on your YouTube channel. Ignoring the trailing slash means that /this and /this/ are treated the same as a source URL. Just a little request to them if they publish video tutorials on how to use them. Moz’s Keyword Difficulty tool is for narrowing down your pool of keywords to the ones you have a shot at ranking for, while Ahref’s Keywords Explorer is for generating new ones. Recently, Ahrefs unraveled a Free Webmaster tool for providing SEO oriented insights. The Keyword Difficulty metric integrates across all keyword reports in Ahrefs tools. KWFINDER $10. The Pittsburgh-based organization had pursued an aggressive strategy of acquiring physicians and hospitals in the Philadelphia area. To show you the SEO metrics, the Toolbar consumes the "Export rows per month" from your account limits: 1 row per URL. The plugin regularly conducts content audits of your website and gives actionable suggestions on improving article performance for a target keyword based on Ahrefs, GA and GSC data. A phylogenetic analysis clustered it together with. Academic writing. Rounding out the comparison is rank tracking, where Bruce Hogan from SoftwarePundit believes SEMrush reigns supreme. First, define the program name, level, and reference, as well as the training location, date, time, and trainer name. Book a call. K. html( Math. Powered by industry-leading link data. Most SEOs know it as a “backlink checker” that competes with Majestic and intelligence/analytics tools with smaller indices like Moz & SEMRush. 8 billion keywords across 10 search engines in 171+ countries. When Ahrefs launched its first tool, Site Explorer, it disrupted the stagnant field of backlink analysis and kickstarted a new round of competition. 11mo. Course materials are available to Ahrefs users: Webmaster tools or Subscription. Ahrefs TV publishes actionable digital marketing tutorials on SEO and YouTube marketing. KEYWORDS EXPLORER. No worries. Let’s take a deeper look at each feature. The tools you will need are Google Search Console (GSC) and Ahrefs Webmaster Tools (AWT). Those who want to rule the world of SEO, often choose two sought-after tools: Ahrefs and Semrush. It runs on a scale from zero to a hundred. As a Search Engine Optimizer, you must have good communication skills and at least 1-2 years experience in technical SEO, on-page and off-page SEO activities. Free for website owners. Step 3: To import or add your project just click on “Add Manually”. Volume. Large image files. Just enter up to ten words or phrases and choose from one of six keyword ideas reports. ” Then, look at the “Internal Link Issues” to see whether you have: Broken links (links that point to a nonexistent destination) Too many on-page links (more than 3,000 links on a. ) And considering that Majestic’s tool is 100% focused on links, this is a great value for anyone that’s on the hunt for a cheap link analysis tool. The deputy AG for the State of. It is truly an industry’s leading SEO Tool in comparison to Aherfs and SE ranking. We are a lean, multinational startup that's headquartered in Singapore. The Ahrefs SEO Toolbar is a versatile free multi-tool for SEO professionals and webmasters, encompassing a range of valuable features such as: 🔸 On-page SEO report. 340. Home — Ahrefs – Here Is How You Use It For Free. Sign up for free. ·. 33 per month when billed annually. Sử dụng công cụ kiểm tra từ khóa Keyword tool miễn phí. Here's how it works: On this page, enter the URLs of the domains you want to check. For an overview of Tag Helpers, see Tag Helpers in ASP. P. Find relevant keywords from our database of over 8 billion queries. There are countless SEO tools online, but most of them are really expensive to use. The platform provides opportunities to track several Ahrefs is a comprehensive SEO tool, which makes it both a valuable addition to your marketing toolset and a beast to learn. Our comprehensive data allows us to provide reliable estimations of a website's organic search traffic in Google. This was our second most popular feature request for Site Explorer in Canny. Overall, when it comes to index size, features, and price, Ahrefs is the best value. The domain authority score changes more often than your blog's PageRank. برای تشخیص اعتبار هر سایتی می‌توانید از بخش Ahrefs Domain Comparison Tool استفاده کنید. Through our videos, you'll learn how to grow organic traffic on Googl. Fellowships -AHERF,IAP,ISCC, Emergency Medicine Certificate Courses. . SiteChecker displays not only the Ahrefs rank but also the domain rating, total external backlinks, and much more: These metrics allow you to see how your site is currently performing. Full access subscription plans are divided into Lite, Standard, Advanced and Agency. Again you can use SEMRUSH and AHERF tool or you can use free tools like Ubersuggest. Your score can be 1 or up to 100. The link provided should match the URL of the file. Our Free Keyword Tool utilizes the latest Google search data to deliver accurate, targeted advertising ideas. Ahrefs is a SaaS company. Definition. (Seo Expert)Seasoned professional with 4 years of experience in SEO,Keyword Analysis,Search Engine Submission,Content Optimization,Website Analysis,off page,on page, webmasters tool, aherf tool,ai. Pick a plan that suits your needs, and we’ll see you on the other side. We would like to show you a description here but the site won’t allow us. 00 for each 30 days. Tutorials, FAQs and best practices with tools like Batch Analysis, Link Intersect, Ahrefs Toolbar etc. 7 million to $306 million, the latter incurred on behalf of Delaware Valley in a 1996 refinancing of its older bonds. However, SEMrush is slightly more versatile – it includes a wider range of tools that support a greater percentage of our marketing efforts. Advice and answers from the Ahrefs Team. Helium10 $10. 2. This is considerably more generous than Ahrefs’ credit-based limit, which restricts to 500 reports per month. AHERF is actively involved in clinical, basic, epidemiological and translational research. (Seo Expert)Seasoned professional with 4 years of experience in SEO,Keyword Analysis,Search Engine Submission,Content Optimization,Website Analysis,off page,on page, webmasters tool, aherf tool,ai. 100% Uptime of Tools with SEO Tools Access ServiceStart course. Fill your content calendar for weeks, months, or even years in minutes. Semrush Free Trial 2023 — Worth $119. The $1. Share your thoughts, and our AI writing tools will generate a huge range of compelling copy with just one click. The page that the website is linking from (linking page) resides under the Referring page column (1) and the page that it links to (destination page) resides under the Anchor and target URL column (2). It runs on a scale from zero to a hundred. This is a paid tool that makes it impossible for ordinary people to use it because they do not have a card to spend, but this tool is expensive. About. What Is Ahrefs Webmaster Tools? Ahrefs Webmaster Tools gives you access to important SEO data for every single one of your websites free of charge. AHERF was a nonprofit Pennsylvania corporation which was one of the largest nonprofit, integrated healthcare systems in the country. Powered by industry-leading link data. First, head to Keywords Explorer. They define your niche and help you identify your competitors. The $1. Google Search Console is one of the essential tools in SEO. For over 10 years now, Ahrefs has been crawling the web, storing and processing petabytes of data and fine-tuning a simple, intuitive user interface. Ahrefs Webmaster Tools. Mateusz Makosiewicz November 9. You can filter links by region, anchor text, domain score, page score, and even by URL. High Energy Radio Frequency. 00 for each month unlimited access. View all your backlinks. Ltd. AHERF researchers along with clinicians from Apollo Hospitals have combined their knowledge and clinical expertise to explore a liquid biopsy assay for detecting brain tumours. API. This should be enough ideas for your channel for the next few months, or maybe even years!See what keywords your competitors rank for in search and how much traffic each keyword brings them. 1. Free Premium Ahref & SEMRush Account | Free Ahref Tool | Free SEMRush Website Link : Hi guys aaj ke is video me mai aapko bataunga ki aap kis tarah se bilkul. 我们公司的SEO策略完全基于Ahrefs工具和教程。. Organic Search, SEM Rush Tool, Aherf Tool, Adword Keyword Planner, Moz Tool, Search Console. F. But Semrush is the #1 alternative to Ahrefs. The AHERF Plan was a "cash balance plan," a form of a defined benefit plan under ERISA in which "the employer's contribution is made into hypothetical individual employee accounts. Out of stock. Backlinks provides advanced filters that make it easy to identify the best link opportunities for you. Aahahrefs. This tool is a project tool—you must set it up as a new project. Keyword difficulty is measured from zero, as the easiest to rank for, to 100, which is the toughest to rank for. It runs on a scale from zero to a hundred. This means it costs one "export row" to show page and domain metrics for the URL you visit when. 95 when billed monthly or $108. Trong cuộc chơi này, Seoer cần rất nhiều sự hỗ trợ từ các công cụ bên thứ 3. See your Google Search Console data directly in Ahrefs. SEMrush: Comprehensive digital marketing tool, but potentially overwhelming. Ahrefs is an all-in-one SEO toolset for growing search traffic and optimizing websites. 00 for each month. Enter a broad description of your product into Ahrefs' Amazon Keyword Tool and check one of the five keyword ideas reports to see the most popular related search terms. But I love lifetime deals. Sitechecker's backlink tracker accomplishes both tasks. Group Buy Seo Tools. DM. In this report, we show all the SEO metrics you need to make quick yet informed decisions about a keyword. Get access to everything Ahrefs has to offer and become an SEO pro. The average DA of a blog with its domain name is between 30 and 40. This data comes from our database of ~500 million keywords (updated monthly). Individually, the ability to make. Every keyword research tool asks for a seed keyword, which it then uses to generate a huge list of keyword ideas (more on that shortly). AHERF was a massive health care system based in Pittsburgh, Pa. Currently it shows many sitewide links – I just used your tool to check backlinks to one of my sites and it. Ahrefs collects, processes, and stores large amounts of data for search marketing professionals. Yes you are right Aherf is one of the best seo tool. Word / Article; Starts with; Ends with; Text; A; A; A; A; Language: Share on Facebook Twitter. Yes, it’s trillions. Ahrefs SEO Toolbar combines on-page SEO checker, broken link checker, link highlighter, redirect tracer, and country changer for search results in one add-on. Verification should be successful if you’re able to see the file when you click on the link provided. Based on my testing Ahrefs has by far the. Looking for abbreviations of AHERF? It is Allegheny Health Education and Research Foundation. I’m going to be showing you 7 actionable ways to use Ahrefs Webmaster Tools later. Vì vậy nếu bạn làm SEO cho dự án cá nhân thì mua như vậy thực sự không ổn. You. Many actors and factors were responsible for AHERF's demise. The 7 Best Ahrefs Alternatives. In addition to Ahrefs, which is an excellent tool, you can access any of the above. Find the best backlink opportunities in your niche at ease. Safari Browser. SerpStat. Rank Tracker lets you monitor your Google rankings on desktop and mobile across 190 countries. Start using our free Website Checker now! Sign up for Ahrefs Webmaster Tools and start improving your website today. When you finalize the list of keywords you want to track, all you have to do is click “Add keywords”. With the Ahrefs Premium Account, you just need to provide details about your websites and keywords. Next, click on “Install,” enter your Apple ID login. Get detailed reports on all your SEO issues and. Find out which websites link to your competitors but don't link to your website yet. Ahrefs is used by marketers from the world’s leading companies. Intent. Enter any broad topic into Keywords Explorer to see thousands of relevant keyword ideas in seconds. To help you make the most out of your Ahrefs subscription, we asked 97 marketers to give us their best tips for using the tool. Ahrefs’ Broken Link Checker is powered by the largest live backlinks database in the industry. So if you buy the Ahrefs tool at a cheap price, then keep reading this post. Our comprehensive data allows us to provide reliable estimations of a website's organic search traffic in Google. (Seo Expert)Seasoned professional with 4 years of experience in SEO,Keyword Analysis,Search Engine Submission,Content Optimization,Website Analysis,off page,on page, webmasters tool, aherf tool,ai. Ahrefs all-in-one SEO toolset can. Gói Agency: 9 99$, khoảng 24. This search engine ranking score is measured by the SEO tool on the basis of a do-follow backlink pointing to your domain. Manage your Ahrefs account and access the powerful SEO tools and resources that help you grow your search traffic. Q. Ahrefs keyword tools offer fewer features, as the keyword research tool consists of two main features: Keyword Explorer. 19 September 2022 14:09. Competitor Analysis: The ability to analyze competitors strategies in depth is a game. Nano Tools for Leaders Series. Semrush’s site audit tool is easier to use than Ahrefs and can automatically provide you with a simple list to follow. AHERF has a Class 10,000 wet lab Cell and Molecular. com, you will also get instant access to Page, Domain, and keyword metrics via your Ahrefs account. Tools. , AhERF-VII) conferred tolerance to water-deficit stress (WS) in transgenic Arabidopsis without. Helium10 $10. March 16, 2000. Ahrefs (que no ahreafs, ahregs, arefs, aherfs, ahefs ni aherefs) es una herramienta de pago pero, sin duda, merece mucho la pena porque es la que tiene el mejor índice de enlaces de Internet. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. And the price is rough. It has successfully crawled around 400 billion pages.