SpyFu

“Competitor keyword research and SEO tools should provide reliable insights, but with 0% success on paid API requests and a staggering average latency of nearly 8 seconds, the implementation of SpyFu leaves much to be desired. While it promises extensive historical data on SEO rankings and PPC ads, the complete failure to handle basic queries suggests a lack of stability and robustness in their API, severely undermining its utility for developers relying on accurate and timely data.”

“SpyFu is completely unreliable—zero out of ten queries succeeded, with half the requests timing out or returning 404s, making it unusable for actual competitive research. For a service charging real money to access SEO and PPC data, this level of API failure is inexcusable.”