QuestionDB

QuestionDB is a tool that helps to research questions based on keywords that users ask online. The online solution is aimed at authors and marketers who want to find questions, ideas, and topics for their content. QuestionDB exists in a free version as well as two paid Pro and Agency versions. In the free edition, the search results are limited to 50 per request. The Pro version for $15 per month delivers all search results and allows up to 500 requests per month. The Agency edition for $50 per month also displays all search results and offers a volume of up to 5,000 requests per month.