Choosing the best Instagram follower tracker app for you depends on your specific needs and budget. Here are a few popular options to consider, each with its own strengths and weaknesses:

Free options:

• Instagram Insights: Built into the Instagram app itself, Insights offers basic but valuable data on your follower growth, engagement, and post performance. While it may not have all the bells and whistles of paid apps, it's a great starting point for understanding your audience and tracking your progress.
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  Instagram Insights app
• TrendHero: This free app provides you with insights into your follower growth, engagement rate, and even competitor analysis. It's a good option for casual users who want a basic overview of their Instagram performance.
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  TrendHero app
• AiGrow: AiGrow offers a free trial of their follower tracker, which includes features like ghost follower detection and competitor analysis. However, the free trial has limited features, and you'll need to upgrade to a paid plan to access all of its functionality.
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  AiGrow app

Paid options:

• Reports+ Followers Tracker: This app is a favorite among many Instagram influencers, offering detailed analytics on your follower growth, engagement, and story performance. It also has features like ghost follower detection and competitor analysis.
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  Reports+ Followers Tracker app
• Crowdfire: Crowdfire is a popular social media management tool that includes a powerful follower tracker. It allows you to track your follower growth, engagement, and mentions, as well as schedule posts and interact with your followers.
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  Crowdfire app
• Iconosquare: Iconosquare is a comprehensive social media analytics platform that offers a wide range of features, including follower tracking, engagement analysis, and competitor benchmarking. It's a good option for businesses and serious Instagram users who need in-depth data and insights.
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  Iconosquare app

Here are some additional factors to consider when choosing a follower tracker app:

• Your budget: Free apps can be a good option for casual users, but paid apps often offer more features and functionality.
• Your needs: Do you need basic insights or do you want in-depth data and analysis?
• Ease of use: Some apps are more user-friendly than others.
• Customer support: Choose an app with good customer support in case you need help.

I hope this information helps you choose the best Instagram follower tracker app for your needs!

Please note that buying followers is against Instagram's terms of service and can get your account suspended. The apps mentioned above are for tracking your existing followers, not for buying new ones.