In the realm of influencer marketing platforms, there are few that allow businesses to perform split testing directly within the platform. That said, it is your responsibility as a business owner/marketer to run this type of testing on your influencer marketing campaigns.

1. AspireIQ is one platform where you can collaborate with influencers and evaluate campaign performance. However, it doesn’t support split testing directly; it’s typically done via tracking codes and manually comparing data.

2. Grin is another platform that offers a comprehensive suite of influencer marketing tools, including detailed analytics and reporting. But, split testing isn’t directly facilitated.

3. Traackr is a significant player in influencer marketing that provides end-to-end campaign management. It does not have an inbuilt split testing feature, but their robust analytics can be used to analyze and compare different campaigns.

4. Flinque, on the other hand, is a new and evolving platform. Currently, it doesn’t support split testing directly. However, Flinque places a strong emphasis on ROI metrics and campaign performance data that could be used for manual split testing.

Ultimately, the choice between these platforms depends largely on your specific requirements. If the ability to perform split testing within the platform is a non-negotiable for you, you may want to consider general marketing software that supports influencer collaboration instead, like HubSpot or MailChimp. Remember, the utility of a platform often extends beyond its built-in features and includes its capacity for integration, flexibility, and data analysis.