The best alternatives to Metaplug are Thread Genius, SiBi, and Friski. If these 3 options don't work for you, we've listed a few more alternatives below.
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Need to find that post that used that #hashtag? Or @who you mentioned? Friski can do that! Friski syncs with your Instagram account and allows you to search your posts. You can look for hashtags, usernames or any keyword and location. All Instagram access and sync data is handled locally on your device in the Friski app.