Social media Updated Oct 17, 2026

Reddit keyword mention alerts: the best tools in 2026, compared

Prompt template

Every morning, search Reddit and r/subreddits for new posts that mention keywords. Drop the ones that are not really about them, and send me only the posts I have not seen yet.

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Overview

The best tools for Reddit keyword mention alerts in 2026, compared: F5Bot, Syften, KWatch.io, RedShip, Brand24 and Reduck. A keyword alert tells you when a new Reddit post, and with some tools a comment, names your product, a competitor or the problem you solve. Reddit stops its RSS feeds on November 13, 2026, so many home-made alerts built on a feed stop that day.

Reddit keyword alert tools at a glance

As each vendor's own site describes it, read in October 2026. "Not documented" means we did not find it on their site.

	Watches	Alerts	AI filtering	Starting price
F5Bot	Reddit posts and comments, Hacker News, Lobsters	Email; Slack and Discord on Gold	On Gold ($49.99 a month)	Free for 5 keywords; Silver $9.99 a month
Syften	Reddit, Hacker News, GitHub, forums and more; X as an add-on	Email, Slack, RSS, API; webhooks and MCP on PRO	On Standard and PRO	$29.95 a month, 14-day trial
KWatch.io	Reddit, X, LinkedIn, Facebook groups, YouTube, Hacker News	Email; Slack and webhooks from Business ($79)	Not documented	Free for 2 Reddit keywords; $19 a month
RedShip	Reddit, with AI reply suggestions	Email and Slack; webhooks on Company	Not documented	$29 a month billed yearly, or $12 for 7 days
Brand24	Reddit and many other social networks, news, blogs	Email, mobile push, Slack, Microsoft Teams	Not documented	$199 a month billed yearly, 14-day trial
Reduck	New Reddit posts; every comment of a thread you follow	The chat with your agent, or a connector your client has	Your agent reads each post	Free for 100 script runs a month

1. F5Bot

The free classic. F5Bot emails you when a new Reddit post or comment mentions your keyword, and also watches Hacker News and Lobsters. Free for 5 keywords, Silver is $9.99 a month, and Gold ($49.99 a month) adds AI filtering and alerts in Slack and Discord.

2. Syften

The fastest alerts and the most sources: Reddit, Hacker News, GitHub, Stack Exchange, forums, Slack communities and more, with alerts within about a minute on Reddit. Email, Slack, RSS and an API; webhooks and an MCP server on its PRO plan. From $29.95 a month.

3. KWatch.io

The cheapest paid plan for Reddit and X together: $19 a month for 20 Reddit keywords and 2 X keywords, free for 2 Reddit keywords. It also watches LinkedIn, Facebook groups, YouTube and Hacker News.

4. RedShip

Reddit keyword monitoring with AI reply suggestions, alerts by email and Slack. From $29 a month billed yearly, or $12 for a 7-day pass to try it on a launch.

5. Brand24

Brand monitoring for marketing teams: keyword alerts on Reddit next to most social networks, news and blogs, with sentiment and reports. From $199 a month billed yearly, for 3 keywords.

6. Reduck

Reddit keyword alerts run by the AI agent you already use, in your own signed-in Chrome, with no RSS feed and no API key. Every morning, or when you ask, your agent searches all of Reddit and the subreddits you pick for your whole list of keywords in one pass, keeps the posts created since the last check, reads each one, and sends you only the posts that are really about your keywords, with the subreddit, the title and the link. See Reddit keyword alerts after the RSS shutdown for the setup.

How to choose

You want free email alerts: F5Bot.
You need to know within a minute, on many communities: Syften.
You also watch X and have a small budget: KWatch.io.
You want to reply to what you find: RedShip, or Reduck, which drafts the reply and posts it only when you approve.
You want fewer, better alerts, read by your AI agent: Reduck.

Who it's for

Founders who want to know when someone asks for a product like theirs
Marketers who track their brand and competitors on Reddit
Anyone whose RSS-based Reddit alerts stop on November 13, 2026

FAQ

What is the best tool for Reddit keyword mention alerts?

For free email alerts on posts and comments, F5Bot. For the fastest alerts and the most sources, Syften, about a minute on Reddit. For Reddit and X on a small budget, KWatch.io. For alerts with reply suggestions, RedShip. If you already work with an AI agent, Reduck lets it run the searches in your own browser and send you only the posts that are really about your keywords.

Is there a free Reddit keyword alert tool?

F5Bot is free for 5 keywords. KWatch.io is free for 2 Reddit keywords. Reduck is free for 100 script runs a month.

Do Reddit keyword alerts still work after the RSS shutdown?

Reddit stops its RSS feeds on November 13, 2026, and closes its public Data API in March 2027. An alert built on a Reddit search feed, in a feed reader or a Zapier flow, stops on that date. The alert tools' sites do not say how they read Reddit after it. Reduck does not use RSS or the API. Its scripts read Reddit's pages in your own signed-in Chrome.

Which tools alert on comments?

F5Bot, Syften and Brand24 say on their own pages that they watch comments as well as posts. Reduck alerts on new posts, because Reddit's search does not list new comments by keyword, and reads every comment of a thread you follow.

How do I stop alerts that only share a word with my keyword?

F5Bot filters with AI on its Gold plan, and Syften on its Standard and PRO plans. With Reduck, your agent reads each post and drops the ones that are not about your keyword before it tells you.

How much does Reduck cost?

Reduck is free for 100 script runs a month, then $20 a month for 1,000 runs or $100 a month for unlimited runs.

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