Reddit shows every user a single number under their username, but that number is actually two separate scores added together. Comment karma and post karma track different behaviors, get calculated differently, and reveal different things about how an account actually uses the site. If you've ever wondered why your comment karma climbs steadily while your post karma barely moves, or the reverse, the answer isn't random. It comes down to what kind of content you're putting into the site and how Reddit's voting system responds to each type.
What post karma actually measures
Post karma comes from submissions: links, images, text posts, videos, anything you submit directly to a subreddit as its own thread. When people upvote your submission, you earn post karma. Downvotes work against you the same way they always have, pulling the score down.
The defining trait of post karma is variance. A single post can blow up. If you catch a subreddit at the right moment with a funny image or a well-timed news link, that one submission might rack up thousands of upvotes in a few hours. That's the appeal of post karma and also its weakness as a signal: it rewards timing and luck almost as much as it rewards effort. Someone with a huge post karma total might have gotten there from a couple of viral hits, not from years of consistent posting.
Subreddits know this. It's part of why post karma alone doesn't tell moderators much about whether an account is a genuine community member or someone who got lucky, or gamed the algorithm, once.
What comment karma actually measures
Comment karma comes from replies: responses to posts, responses to other comments, any contribution made inside an existing thread rather than as its own submission. Every upvote on a comment adds to this score, every downvote subtracts.
Comment karma behaves differently because comments rarely go viral in isolation. A comment's visibility is capped by the post it's attached to and by how deep in the thread it sits. A brilliant top-level comment on a huge post can rack up serious karma, but a genuinely great reply buried six levels down in the replies usually caps out much lower, no matter how good it is. That built-in ceiling means comment karma tends to accumulate more slowly and more consistently than post karma. You don't get a lucky viral moment for a comment the way you can for a submission. You get it one thread at a time, one conversation at a time.
That's the core structural difference. Post karma is submission-based and lumpy. Comment karma is participation-based and gradual.
Why Reddit tracks them separately instead of one combined score
Reddit could have just added these together into a single number and called it a day. It didn't, and the separation exists because a combined score would flatten two very different behaviors into something meaningless.
Think about what a single "karma" number would actually tell you. An account with a large combined karma total could be someone who's spent three years replying thoughtfully in niche subreddits, or it could be someone who submitted one meme that hit the front page last week. Those are wildly different account histories, but a merged score makes them look identical. Separating the two scores keeps that distinction visible.
It also matters for how each type of karma gets earned. Submitting a post is a single action with a single outcome: it either catches on or it doesn't. Commenting is repeated and contextual: it depends on reading a thread, understanding what's already been said, and adding something that fits the conversation. These are different skills and different kinds of effort, and Reddit's scoring reflects that by keeping them in separate buckets rather than pretending they're interchangeable.
What the split reveals about an account's actual behavior
Once you know the two numbers are tracked separately, you can read them like a rough behavioral fingerprint. An account with heavy comment karma and thin post karma has probably spent most of its time responding to other people rather than starting threads of its own. That's typical of someone who lurks a subreddit, reads what others post, and jumps into discussions rather than initiating them.
Flip it around and you get a different picture. An account with high post karma and comparatively little comment karma likely spends its energy finding or creating shareable content and submitting it, without engaging much in the back-and-forth of actual discussion. That's a different kind of Reddit user: more curator or creator, less conversationalist.
Neither pattern is inherently better, they just describe different habits. But the ratio does say something real about how long an account has likely been active and how it spends its time. A newer account can rack up post karma quickly if it gets lucky. Comment karma is harder to fake that way, because it usually requires actually reading threads and responding to them across many different posts over time. That's precisely why some communities lean on it the way they do.
Why some subreddits gate posting behind a comment-karma minimum
If you've tried to post in certain subreddits, especially larger or more established ones, you've probably run into a rule requiring some minimum amount of comment karma before you're allowed to submit anything. This isn't arbitrary. It's a deliberate anti-spam filter, and it targets comment karma specifically rather than total karma or post karma for a reason.
Post karma is comparatively easy to inflate with minimal genuine participation. A single viral post, even from a brand-new account, can generate more post karma in one day than most regular users accumulate in months. If a subreddit required a post-karma minimum, a spammer could clear that bar with one lucky submission somewhere else and then pivot straight into spam.
Comment karma doesn't work that way. Because comments are capped by their thread's visibility, and because there's no equivalent to a viral post for an individual comment sitting in a stack of replies, comment karma requires sustained participation. Building it up means actually showing up in multiple threads, actually reading conversations, and actually contributing something other users find worth upvoting. There's no easy shortcut for a brand-new account to generate a lot of comment karma overnight.
That's exactly why moderators use it as a gate. A comment-karma requirement filters for accounts that have done the slower work of engaging with the community as a community, rather than accounts that showed up once, got lucky, and are ready to post links. It's not a perfect filter. Nothing is. But it's a much better proxy for "has this account actually participated here" than total karma or post karma would be on their own. If you want the fuller picture of how the scoring system works beyond this comment/post split, how Reddit karma works goes into the mechanics in more depth.
A quick way to read someone's activity split
Once you know these two numbers exist separately, it takes only a second to glance at a profile and form a rough read of someone's habits. If comment karma dwarfs post karma, that person is likely a discussion-first user: someone who reads a lot of threads and jumps into the conversation more often than they start one. If post karma dwarfs comment karma, that person is more likely a submitter: someone who finds or creates shareable content and posts it, without necessarily sticking around to discuss it afterward.
Neither split tells you anything about the quality of that person's contributions, only the shape of their activity. A profile heavy on comment karma with almost no post karma isn't more or less trustworthy than the reverse; it's just a different usage pattern, and recognizing that pattern is mostly useful for understanding what kind of Reddit user you're looking at before reading further into anything they've said.
Why this matters for how Karmflow treats comments differently from votes
This same distinction is why Karmflow doesn't lump custom comments in with upvotes and downvotes as a single kind of service. Voting on existing content and writing a comment are fundamentally different actions with different risk profiles attached to them.
An upvote or downvote is a single click. It doesn't attach any new text to an account, it doesn't require any judgment about a subreddit's tone or rules, and it doesn't leave a written trace tied to that account beyond the vote itself. A comment is different. It's real written text, publicly attributed to a specific account, sitting in a thread where other users and moderators can read it, judge it, and reply to it. That's a categorically different kind of action than a vote, and it carries a different kind of risk if it's done carelessly: a bad comment can look out of place, get downvoted, or draw moderator attention in a way a vote never will.
That's the reasoning behind treating custom comments as their own distinct service rather than a variant of upvote or downvote packages. Comments need to fit the thread they're posted in, match the tone of the subreddit, and read like something an actual participant would write, not just numbers attached to a username. Reddit's own decision to separate comment karma from post karma reflects the same underlying truth: writing something and voting on something aren't the same action, and treating them as interchangeable misses what actually makes an account look, and behave, like a genuine part of a community.