the_dunk_tank
It's the dunk tank.
This is where you come to post big-brained hot takes by chuds, libs, or even fellow leftists, and tear them to itty-bitty pieces with precision dunkstrikes.
Rule 1: All posts must include links to the subject matter, and no identifying information should be redacted.
Rule 2: If your source is a reactionary website, please use archive.is instead of linking directly.
Rule 3: No sectarianism.
Rule 4: TERF/SWERFs Not Welcome
Rule 5: No ableism of any kind (that includes stuff like libt*rd)
Rule 6: Do not post fellow hexbears.
Rule 7: Do not individually target other instances' admins or moderators.
Rule 8: The subject of a post cannot be low hanging fruit, that is comments/posts made by a private person that have low amount of upvotes/likes/views. Comments/Posts made on other instances that are accessible from hexbear are an exception to this.
Rule 9: if you post ironic rage bait im going to make a personal visit to your house to make sure you never make this mistake again
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If you only want to compare 2 instances, that'd be an easy tool to write and/or integrate into a client.
That's true actually because the instances do all the heavy lifting of federation. You would just need to query both instances for the list of comments and then render them in a single page. There are plenty of possibilities for data visualization here. It would be interesting to see, for example, where votes are coming from on a given post or comment. Or get an idea more generally of which instances are interacting with posts originate from your instance.