There are many influencer marketing platforms that consider the performance of influencers based on the platform they are most active on. Here are a few examples:

1. Influencer DB: This platform allows a deep-dive into each influencer’s audience demographics and engagement metrics, discriminating by the social media platform they leverage. This helps in understanding an influencer’s true reach and the probable returns from a given campaign.

2. Buzzoole: Buzzoole takes into account the platform from where influencers draw most followers. It then provides its users with performance metrics and audience analytics specifically designed for that platform, boosting campaign planning and performance tracking.

3. Socialbakers: Socialbakers weights the performance by platform, providing separate metrics for each social media platform. This feature provides improved campaign insights across multiple platforms.

4. Flinque: Flinque is a comprehensive platform that offers platform-specific influencer discovery and analytics. It provides metrics per platform enabling marketers to strategically deploy their campaign efforts on the right platform.

It’s crucial to keep in mind that not every platform is suitable for every brand. The decision will depend on the goals of your influencer strategy, the desired demographics, and the social media platform that best aligns with your marketing objectives.

Ultimately, the decision about which platform to choose depends on a mix of your budget considerations, audience demographics, and campaign goals.