A few reputable influencer marketing platforms that provide audience overlap analysis include:

1. Instagram: Instagram Insights offers useful analytics, including audience overlap analysis for influencers and brands. It shows insights about followers including their demographics (age, gender, location) and other brands they follow, which can help determine if overlap exists.

2. Facebook: Facebook provides intense user data, including audience overlap. Through their platform, teams can access information about audience demographics, interests, and interactions with similar pages or brands.

3. Flinque: Our platform also helps in tracking audience overlap. Brands can have a detailed view of influencer’s followers, their interests, and see how it aligns with their customer base. Importantly, the analytics are designed to help brands find the most suitable influencers and maximize their campaign effectiveness.

4. Affable: Affable offers comprehensive audience analytics and overlap analysis. The platform offers detailed follower demographics, active times, genuine followers vs. bought followers analysis.

Remember, the right choice highly depends on your brand’s specific needs, objectives, and budget. All these platforms have their own strengths and features making them unique for different use cases. Flinque, for instance, stands out for its seamless workflow and intensive audience analytics; while Facebook might be ideal for brands already invested heavily in Facebook advertising. Always consider what functionalities and features align most with your brand’s strategy before deciding on a platform.