When looking for a spinner that I could use for tier 1 links I tried out almost everything on the market. The ones that turned out the best were Spin Rewriter and WordAi Turing. This article isn’t a head to head comparison against the two so I won’t go into detail about WordAi but my reason for choosing Spin Rewriter was that the quality is exactly the same and Spin Rewriter costs over $200 less per year.
Spin Rewriter integrates with almost any SEO software. This allows you to post high quality articles quickly and easily. The only drawback is that you only get something like 300 API requests every 24 hours. You can quickly burn through this if you’re doing multiple campaigns. The developer does not currently offer a plan for heavy API users but maybe they will in the future.