Also, not every service can have organic traction. Some services are just not social / sharable (I would even say most services), and must rely on tried-and-true user acquisition techniques - ads, affiliates and so forth. It's also possible that your service is not of enough interest or use to people who are not friends and family (just putting it out there).
1) Are you just providing keyword tracking? While this is useful in the SEO-world, I'm not sure how useful this is in the app store. Mostly because there is very few actions they can take if they did drop their rankings. Do you provide actionable advice on getting higher rankings rather than objective advice like "You rank #5 for cars in the App Store"?
2) If your product isn't popular enough, you should consider pairing it with consulting service as well. Provide consulting for those that want to rank high on the App Store. That is.. IF you have the expertise in that arena.
3) SearchRank.is -> not a big deal for now, but you might want to consider rebranding it so that it caters more to App Store Optimization rather than SEO.
Overall, I'm probably in your target audience. But I don't care for knowing how I rank for keywords in the App Store. I want actionable advice. Tell me HOW to rank high for a keyword. Rather than a ranking tool, give me a GRADING tool. What changes should I make to my title? What keywords to add to my description? Is there a correlation between # of reviews and rank? keywords in those reviews vs rank?
You work on a search ranking tool for IOS.
This line of questioning seems a bit odd given your experience. You should be giving us advice :-)
It is mostly a compile from many resources and still working on it-