In a multichannel influencer campaign, measuring success involves tracking multiple metrics across each platform. These may include engagement rates (likes, shares, comments), follower gains, click-through rates (CTR), views, reach, and even more granular data like saves or sticker taps on Instagram Stories. Also, important is measuring the conversion that directly contributes to your business objectives: app downloads, sign-ups, sales, lead generation, etc.

Different platforms have different analytic tools. Instagram has Instagram Insights, YouTube has YouTube Analytics, Twitter offers Twitter Analytics, and TikTok has TikTok Analytics. These native tools provide a wealth of information regarding user engagement and interaction, though might lack in collating data from multiple platform campaigns.

This is where third-party platforms come into play. They provide an easier way to collate data from various platforms, giving you an all-in-one influencer marketing dashboard. Brands can use tools like Flinque, Hootsuite, or Sprout Social to effectively track, measure, and compare the results of their multichannel campaigns.

For instance, the Flinque platform provides brands with a unified dashboard that pulls in performance data from all platforms, facilitating cross-channel comparison. It offers a thorough breakdown of audience demographics and campaign performance, making it easier to identify the most successful elements of a campaign.

Always remember though, the best tool or approach will invariably depend on your specific needs and goals. Therefore, the key to any successful influencer marketing campaign lies in understanding what you want to achieve, tracking the right metrics and using the right tools to analyze and optimize your multichannel actions for continuous improvement.