The What topics can I ask about here? help page does not explicitly mention that website recommendations are off-topic. It says that "requests for specific service provider recommendations" are off-topic. Some people may reason that this allows recommendations of websites that display free data.
Context: Is it possible to comprehensively compare personal tax rates between countries?
I apologize if this might be the wrong site to ask, I didn't specifically see anything in the help section going against "recommendation questions".
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In a comment by the OP:
dont-ask Doesn't mention recommendation once; the on-topic help page mentions it in the context of Investing/Saving (first three mentions), and then again in the specific context of investing (i.e., paid) providers further down.