What are some alternatives?
When comparing GroupHigh and RankHacker.com, you can also consider the following products
Ninja Outreach - Influencer Marketing & Outreach Software All in One. Get instant access to over 25 million bloggers & social media influencers without the hassle!
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
FameBit - Easiest Way to Find, Hire, and Work with YouTube Influencers
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
BuzzSumo - BuzzSumo allows you to discover the most shared links and key influencers for any topic. It's free to use and you can run a search in seconds!
SEO Tools Centre - SEO Tools Centre provides SEO checker services for websites.