"SEO Manager, by at2 GmbH, may be my favorite app" (seo.com)
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"This is the SEO App of all SEO Apps." (yourcontentnotes.com)
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SEO Manager is your best assistant if you optimize your webpage for search engines.
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It keeps track of the most important thing in SEO work: Your true keyword ranking.
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☛ Important: SEO Manager does NOT do search engine optimization for you nor provide you with tips, how you should do it. There are plenty of blogs out there that write about it. Try their receipes and SEO Manager will analyze their impact.
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Great features if you want to do serious SEO work:

✔ Unlimited Webpages
✔ Unlimited Keywords
✔ REAL keyword rankings (no Google API)
✔ All Google Domains and languages supported
✔ History graphs of your rankings
✔ PageRank checks
✔ Competitor analysis (also with PageRank)
✔ Great interface with color coding