Find people who do not follow you back on INSTAGRAM (Manual way)

Steps:

1. From your computer, Go to instagram.com, login and open your profile page.
The URL of your page will look like this: https://instagram.com/<your_username>

2. Click on 'Followers' where you can view your followers. (Scroll till the end so that all your followers are visible (to ensure all followers are populated in the box))

Right-click on any follower's name, and click "Inspect Element"

You'll see a highlighted code like this, where the follower's name is 'food_chronicles_1' in this case:

3. Copy the class name of the <a> tag. At this moment, it's '_2g7d5 notranslate _o5iw8'

4. Now click the "Console" tab and enter the following code line-by-line to get all usernames:

Copy-paste the output of the code containing comma-separated followers somewhere safe.

5. Now, click somewhere outside, and click on 'Following' to see whom you follow. (Scroll continuously till you see all the people you follow (to ensure all followers are populated in the box))

Right-click on anyone's name, and click "Inspect Element". You will see a similar highlighted code like step-2.
Copy the class name of the <a> tag. At this moment, it's '_2g7d5 notranslate _o5iw8'

6. Now click the "Console" tab and enter the following code line-by-line to get all usernames:

Copy-paste the output of the code containing comma-separated usernames somewhere safe.

7. Now we have the list of all followers and following users.
It's simple now, we just have to find the usernames in the second list (following list) which are not present in the first list (followers list).

I wrote a Java program for that.
Click the Run Button below, Paste your list 1, press Enter, then list 2.
You'll see the list of people who don't follow you back.



PS:
This is a very long way, but it was fun to do it.
There are many ways to improve this method, but I thought of keeping this simple and didn't want to waste much time (it took me an hour though)
Let me know your opinions in the comments.