Syften is a solid firehose: it monitors Reddit, Hacker News, Indie Hackers, GitHub, X, forums and a dozen more, and mails you the matches. The catch is that keyword matches are not opportunities. Karmy watches Reddit only, decides which threads are worth your reply while they are still young, and hands you the comment written.
Prices and features read from the vendor's own public pages, checked August 2026. Syften is a trademark of its owner; Karmy is not affiliated with it.
An inbox with sixty matches a day dies in a month. Karmy sends the two or three threads where someone is actually asking for a product like yours, and stays quiet the rest of the time.
Finding the thread is half the job. Karmy writes the reply in your product voice so you can edit it and paste it in two minutes, before the thread fills up.
A thread is read in its first hours. Karmy surfaces the fresh ones with few comments, which is exactly where a reply still gets seen.
No new dashboard, no filter syntax to maintain. It arrives in Telegram and you act from there.
You genuinely need to hear every mention across Hacker News, GitHub, Stack Exchange, podcasts and forums, and you are happy to triage them yourself. That is a real job, and Syften does it well. Karmy is narrower on purpose: Reddit, buying intent, and the reply.
Karmy starts at €9/mo and Syften at $29.95/mo on its Entry plan. Both offer a free trial: 10 days on Karmy without a card, 14 days on the Syften PRO plan.
No. Karmy is Reddit only, on purpose. If your buyers are on Hacker News, GitHub or niche forums, Syften covers far more ground.
No. It finds the thread and writes the draft; you edit it and post it from your own account, which is what keeps the account safe.
Yes, on the Growth plan a webhook sends each one to Slack, your CRM, a spreadsheet or your own code.
Syften gives you a filter language. You write the rules, tune them when they misfire, and it delivers matches to Slack or email fast, with published plans from around $30 a month. In the right hands it is precise, and it covers more than Reddit.
Karmy has no filter syntax to learn. It reads the thread and judges whether someone is actually looking for what your product does, then writes the reply. You set the product and the tone, not boolean rules.
Syften: total, and it is yours to maintain. Karmy: you set the product, the use cases and the tone, and correct the picks with Done and Report.
Syften: write filters, iterate for a few days. Karmy: a couple of minutes, then it proposes the subreddits.
Syften delivers the match. Karmy delivers a draft written for that thread, which is usually the part that takes the time.
Syften covers Reddit, Hacker News, forums and more. Karmy is Reddit only, with subreddit rules and posting norms built in. For a multi-platform lead inbox instead, see the EaseClaw comparison.
A filter cannot tell the difference between someone naming your category in passing and someone asking which tool to buy. Reading the thread can, and that is the judgement Karmy applies before it sends anything.
A filter cannot write your reply. When the finding is solved, the writing is the bottleneck, and a draft that already respects the subreddit’s rules is what turns a match into a comment that is actually posted.
No. You describe the product and its use cases; Karmy proposes the subreddits and judges each thread. Corrections come from using it, not from editing rules.
Karmy is built to find threads to answer rather than to catch every mention of a word. For pure brand monitoring, a keyword tool is the right instrument, and many people run both.
No, Reddit only. Syften covers more sources; Karmy goes deeper on one.
Weighing Syften against the other options? These pages lay out the same split, tool by tool.
A ping while the thread is still young, with the draft written. You edit it and post it yourself.
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