Is there a way to track someone’s TikTok activity, like what they are liking, who they are interacting with, without following them? If there’s any tool or tips i’d love to hear them.
You can only see someone’s activity if they have a public profile and their likes and reposts setting is enabled for public. Otherwise, there’s no way you can view what the are upto on TikTok. If they have a private account and you follow them, there are high chance you can keep track of their posts and comments.
Oh, there are many workarounds, but the easiest and most reliable one is using Xnspy. I have been using the app for 5 months, and honestly, no complaints. Through Xnspy, I can monitor TikTok activity without even following them. The app logs everything and displays it on the web dashboard.
But one thing worth mentioning here is that you need one-time device access to install the app in the target device. After that yiu can monitor TikTok activity remotely. 
Have you tried using TikTok parental controls? Its not the ultimate solution but you can use it for kids account monitoring. It allows you to set screen-time limits, restrict certain content, control Dms and search. Also, you don’t need to install another tool just for this simple task, specially when TikTok parental control tools are free.
Let me clear some things for you before you make a decision you regret.
TikTok only lets you see:
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What someone chooses to make public
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Their interactions with you
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Very limited online status, that too if you are a mutual and their activity status is on.
There’s isnt a legit way to see someone’s TikTok activity unless you have their account credentials. For remote monitoring, you can go for Xnspy as the app that does the job and provides all the data you are looking for. Other than that, on iOS, your only option is Family Sharing+ screen time. You can check how much they spend on the app and put restrictive controls on it.
Even though Andriod devices are more flexible when it comes to installing monitoring apps, I’d suggest going for the built-in tools. They are hassle-free and won’t cost a dime. The choice is yours. 
From my experience, no matter how much monitoring you do, kids always find a way to sneak around, so the best solution is let them use the app and set healthy boundaries. Make them aware of your concerns and monitor their phone usage frequently.
See, TikTok has strict privacy regulations. Without a monitoring tool, you can’t really see what the other person is up to. You can use Qustudio or Xnspy for this purpose, but of course, with their consent. I have personally used Xnspy, and the app gives you all the data, including comments, posts, activity status, search queries, etc. also you can access internet history through the internet history tab on the Xnpsy web dashboard. Hope this helps!
You can’t really access someone’s TikTok activity unless they willingly share it with you or have a public account. If their account is public, you might find their activity crumbs like comments on someone’s posts, their reposts, and liked videos. But all this is highly dependent on whether they have privacy set to public or not.