Link Explorer from Moz is a link building utility, replacing the former Open Site Explorer. Moz describes Link Explorer as a highly accurate link tool that lets users check the backlink profile and Domain Authority of any site.
Moz was acquired by iContact in June, 2021.
KeywordSpy is appropriate for most Internet Market research companies. I would not suggest it for a corporate marketing department unless it's a company with a very larger budget. This is also not a tool for small freelancers even though there is a free option, to get the best benefit of KeywordSpy it's best to use most of its features and options and this can get pricey.
It is helpful if you are trying to understand where a site stands in terms of the links coming to it from different websites. It is less helpful in terms of providing specific actions or steps to take to get more links. However, it is a part of a larger Moz package so other areas provide information that can help there.
Moz Link Explorer has a straightforward and easy to use interface. It’s very simple to navigate and understand the data.
The anchor text tool gives you an idea of the most widely used anchor texts other websites use when linking to your site. It can raise a red flag when too many sites are linking to you using exact match keyword anchor texts.
You need to subscribe to Moz Pro to get all features, which is pricey if you aren’t using the tool regularly.
I’ve found that competitor tools give larger lists of inbound links.
You’ll need some understanding of how SEO works to maximize the tool. Would non-SEO specialists understand the difference between domain authority and page authority, or the difference between follow back, and non-follow backlinks? Moz offers lots of training resources, but it takes time to learn what you need.
I put a middling score here because of the difference in support between the free and premium uses. The Free tool was a great service, but there wasn't much support. It was tool that was intended to have a skilled SEO utilize it and save time. The Premium version has great support, but also offered more information so that skilled SEOs and novices alike could benefit from the tool.
Most SEO and market research tools offer what KeywordSpy has but are not as detailed and in one place. Consequently, where you can do everything at KeywordSpy, with other tools you find you have to purchase multiple tools or subscriptions from different providers which also don't integrate with each other. KeywordSpy makes your research easier and more efficient.
Ahrefs is much more comprehensive than Open Site Explorer. If you are in need of a deep backlink analysis there are better options out there for your money. If you need a quick look at the state of a client's backlink profile than OSE is for you. It will give you the top metrics you are looking for and then some. I find OSE to be more user-friendly than competitors