Top 5 SEO tools you’ll want to use in 2021

Morten Frølich January 19, 2021 seo

The best SEO tools in 2021

Great SEO tools can get you a long way, when you are optimizing your website for search engine visibility, but which ones should you choose?

The web is overloaded with different SEO tools, and the quality and useability of these tools can vary a lot.

Different tools also tend to have different features, which is why most heavy SEO practitioners use a combination of two or more tools.

Here’s our recommendations of tools to spice up your SEO efforts in 2021.

The list contains some usual suspects, but that’s because they are (still) the best. To narrow the field, we have prioritized tools not offered by Google or Bing:

1. SEMrush:

With 48 tools SEMrush leads the way. They offer tools like Keyword Gap and Market Explorer that not many else can provide, especially not with that level of quality, available from one single domain.

All the tools complement each other well, and if you want to dwell into an in-depth content audit analysis or a competitive SEO analysis, their tools and guides will show you how.

They have their own academy (of course!), an awesome blog and other extremely cool features.

As stated on their blog, they are recognized as the best SEO suite according to US Search Awards 2019, MENA Search awards 2019, and SEMY awards 2019, and as the best digital tool according to Interactive Marketing awards 2019.

They have three billing plans (Pro, Guru and Business), and offer a free 7-day Pro-trial.

2. SpyFu:

Spyfu comes with several very valuable tools (16 in all) and a very well-thought-out design that enhances the user experience to an awesome level.

Compared to SEMrush, SpyFu focuses specifically on keyword research and competitive analysis. If that’s what you need, you’ll be happy saving money and going with SpyFu.

If you want a leading all-in-one SEO platform with the full set of features, we recommend SEMrush, and that’s also why they occupy the number 1 spot; nobody can compete with their overall package.

That said, Spyfu is well on its way, and PC Mag picked it for its “editors’ choice” badge in 2019, and it has also been categorized by G2crowd as part of the “Top 50 Products for Marketing 2020”.

It offers three billing plans: Basic, Professional & Team (with a free 30-day trial).

3. Ahrefs:

Ahrefs comes with 5 tools that cover the basics.

Like SEMrush, Ahrefs offers SEO and backlink analysis, but according to Chris Hornyak, editor and SEO analyst at digital marketing firm The Content Factory, SEMrush tends to be better when it comes to keyword research and technical analysis between domains, while Ahrefs tends to be better at analyzing backlinks.

Backlinks are the main Google ranking factor, and even though Ahrefs excel in that aspect, they can’t compete with SEMrush’ tool package or Spyfu’s keyword research, design and usability.

They do rule the academy and blog universe though, and packages come in 4: Lite, Standard, Advanced and Agency, but there’s no free trial.

4. Moz:

Moz offers 6 solid and free tools. One of them, the Domain SEO analysis Tool can be used directly online, the others necessitate downloading or sign-up.

The company is a pioneer when it comes to basic SEO, and the reputation in the industry is so good that its metrics have become an industry standard even for marketers that use other tools.

Their resource features are great, and their blog is legendary.

Besides the tools described above, it also offers Moz Local, Moz Pro (30-day free trial) which are both SEO products, and STAT (search analytics), and this is where it can be a bit confusing, because they have four billing plans as well connected to the Moz Pro product: Standard, Medium, Large and Premium.

For the beginner, it can be a bit difficult to find out exactly what product or package to start with, but the tools are fantastic and easy to use, and if you combine Moz Pro and STAT, you get a breadth and depth of customer data that hasn’t existed before in our industry.

5. Keywordtool:

It’s solid, easy to use and legendary in the business.

It breaks down keyword data across multiple high-volume sites like Google, YouTube, Amazon, and more.

On top of that, it’s easy to dig down into essential marketing data like cost-per-click, search volume, and competition, only disadvantage is that they don’t offer a greater variety of tools.

According to them, they are the best alternative to Google Keyword Planner, and we tend to agree. If you only do keywords, this tool will do the job.

It offers 3 billing plans: Pro basic, Pro plus and Pro Business, but no free trial.

Honorable mentions:

Here’s a couple of other tools (in no particular order) that’s also very recommendable, and some of them could’ve easily made it in to the top 5:


Ubersuggest is SEO-Guru Neil Patels playground. It focuses on keywords, SEO and baacklinks, and it’s a fine tool, but it also has its limitations, like in the number of markets/languages that it offers insight into.

Screaming Frog:

Screaming Frog offers crawler and log file analyser tools. It let’s you crawl up to 500 URL’s with a free account. The free version is quite useful. It is used company-wide and is a very good tool to get a good “look” at the on-page health of a site. The paid version allows integration with Google Analytics and Search Console.


Resourceful and fairly smooth, SimilarWeb is a tool that estimates the total amount of traffic different websites get. It allows you to see competitors’ top traffic sources, broken down into six major categories, including referring sites, social traffic, and top search keywords.


Mangools are also known as Ahrefs little brother, which means that it’s quit similar to Ahrefs in some respects. It offers 8 tools, and 3 of them is totally free, while the rest can be tested in a 10-day trial.


It’s a fine overall SEO tool, but only useable for WordPress, and even though almost 40 % of webpages are built with WordPress, it narrows the fields of users down considerably. Most users use it as a part of the WordPress-solution, when developing a website.


The design is simple, the data is solid and it’s very easy to use. It’s especially valuable if you want to find broken links or duplicated content, and you can use a good and totally free version, or you can pay your way to a premium version with more features.



What is a SEO tool?

A SEO tool is a tool that is used to optimize your domains search engine visibility. There are many kinds of SEO tools depending on which part of the domain you want to optimize, but the most common ones are keyword tools, SEO audit tools and pagespeed tools.

How many kinds of SEO tools are there?

A lot, both in terms of what aspects of SEO you want to optimize (Keywords? Pagespeed? Etc.), and in terms of payability. There are very good SEO tools that demand paid subscriptions, and very good free SEO tools.

Who uses SEO tools?

SEO tools are used by almost everyone with a website. Some use them only a couple of times a year, while webshop-owners or SEO specialists use them on a daily basis.

How do you use a SEO tool?

That depends on the purpose, but most SEO tools are easy to use, and the common way to start is by typing the domain you want to optimize into the tool box.

What’s the best paid SEO tool there is?

That’s a question of taste, but Semrush would be a solid bet. Their tool package is very broad and extensive, and the prices are affordable.
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