What goals you need to achieve with SEO tools?
If you do SEO yourself for your very own site you do not really want advanced reporting facilities with eye-candy charts and pretty graphs. However, if you offer SEO services or intend to begin doing that in future, you have to pay close attention to tools' reporting functions: which usually formats do they support, could you brand and customize reports, etc.
Few SEO tools such as Wolf Seo Tool are subscription based; numerous others are sold on a one-go payment basis. When you know time frame of the project it is relatively easier for you to select right subscription period. It is significant to remember that ranking on top for KWs isn't ultimate aim. You do not require search rankings; you want subscribers, visitors, clients and sales to grow the business. It is significant to clearly set the goals from very beginning so that you're able to tell whether tools you have purchased will drive you towards the goal, or if you need to try something else.
To be able to guess the value that your SEO tools such as Wolf Seo Tool or subscription service get you need to decide how you will be measuring success. There might be numerous success metrics like traffic, rankings, ROI, conversions, etc. Success metrics might differ depending on SEO task: e.g. if you somehow managed to unearth few really lucrative KWs but failed to get fine rankings for them means, you have a good keyword tool but you have to search for a better tool for link building.
It is vital to come up with success metrics long before you begin using Wolf Seo Tool so that you can properly measure manual productivity and evaluate how the SEO tools assist you in boosting efficiency and whether they're worth investment made.