SEO SpyGlass by SEO PowerSuite – This downloadable SEO software provides access to Webmeup’s backlink index.

On the lowest Semrush plan, you get 3,000 monthly credits and that number increases on higher plans. You only get 500 monthly credits whether you pay $99/month or $999/month. Some backlink functionality is locked away behind higher tier plans and reporting limits do not increase on higher plans. Their new pricing structure offers far less value than any other tool on this list and they charge overages automatically.

Ahrefs – Their link database is huge and they have a fantastic UI but the tool is let down by technical issues and dubious pricing tactics.

It’s worth noting that their keyword database is huge as well. For some of my searches, they found more referring domains than any other tool. It’s also an affordable option for agencies and freelancers thanks to the way they price projects & user accounts. It’s a complete SEO toolkit with one of the largest backlink indexes around.

SE Ranking – Some people still believe this tool is just rank tracking software but it’s so much more.

Add-ons available which include a traffic analytics tool comparable to SimilarWeb. The entry-level plan is higher than others but it offers a lot for the money & usage limits are very generous. Semrush – Best backlink checker tool overall.

Backlink checker tool