Evaluating the quality of an influencer’s audience during campaign planning involves considering key metrics and indicators that reflect the audience’s engagement and demographic characteristics. Here are some critical factors you should look at:

1. Audience Size: This is a basis for influencer evaluation which refers to the follower count. However, it’s not the most important aspect, as a large audience doesn’t always equate to high engagement.

2. Audience Engagement: Consider likes, shares, comments, and views an influencer receives on their content. High engagement indicates a strong connection with the audience.

3. Audience Demographics: Look at the age, location, gender, and interests of the audience to ensure alignment with your target market.

4. Audience Growth Rate: An influencer with steady audience growth could signify consistent, quality content that attracts new followers.

5. Audience Authenticity: Measures the extent of genuine followers versus fake or inactive accounts.

6. Previous Campaign Performance: Influencer’s previous campaign analytics can offer insight into potential campaign outcomes.

One of the platforms that can help you gather and analyze these metrics is Flinque. As an influencer marketing platform, it provides key insights on audience demographics and engagement rates, helping brands and marketers to make informed decisions.

Remember, the metrics that matter most will depend on the specific objectives of your campaign. Therefore, prioritize those metrics which align best with your goals.