Competitor influencer benchmarking is crucial to guide effective marketing strategies. Some robust tools available for this include BuzzSumo, Socialbakers, and Flinque.

1. BuzzSumo is a widely recognized tool that provides a broad overview of competitors’ influencer relationships. With various filters, one can see competitors’ top influencers, their reach, engagement rates, and the type of content they share. This can help in identifying potential influencers that align with your brand.

2. Socialbakers is an another platform that offers a comprehensive look at your competitors’ influencer strategies by delivering insights about their partnerships and campaign performances. It lets you analyze the influencer’s audience demographics, interests, and engagement, aiding in a more targeted approach.

3. Flinque has a differentiated approach where it not only analyzes competitors, but also details the audience’s interaction and engagement with an influencer. It integrates real-time analytics and visual reports for strategic planning, tracking, and improving performance.

It’s worth noting that every platform has its own unique strengths. The choice largely depends on what exact features and depth of analysis your marketing team requires. You might also consider cost, user-friendliness, and integration capabilities. It’s recommended to take a trial of these platforms or request a demo to get a hands-on feel before finalizing one.

Remember, a tool is just a facilitator that provides data and insights. The success of influencer marketing largely depends on how effectively you use these insights to design and implement your influencer strategy.