I missed the earlier rank tracker saas deals on appsumo like AccuRanker, and I really needed one. So I bought a few all-in-one SEO saas deals, but their rank tracking turned out to be either insufficient (like only 100 keywords) or non-functional.

SerpWatch is the most expensive deal I have purchased on appsumo (I got 5 codes). But after 2 weeks of testing, I found it worth it.

5 Codes gives you 10x value at 5x price. so really worth it.

4500 credits mean you can check 4500 rankings in a month.
So, if you are checking daily you can track 4500/30 = 150 keywords.
But, if you are tracking weekly, you can track 1000+ keywords.

1000 Keywords for 1 code costing $69 is superb, considering most people only need weekly tracking. It gets even cheaper with more codes.

I was also wary of the future of the saas, as serp tracking requires continuous resources. But, looks like they have a solid product and a good roadmap. So it wont be difficult to acquire paid monthly customers along the road. Hence it is beneficial to ride on this bus.