F5Bot Alternatives for Reddit Keyword Alerts in 2026

F5Bot is still the easiest way to get Reddit keyword alerts for free: you add a few keywords and it emails you when they appear in Reddit, Hacker News or Lobsters posts and comments. People look for an F5Bot alternative when they track a popular term, need alerts in Slack or their own code, want X covered too, or are drowning in irrelevant matches. This post explains how F5Bot works as of October 2026 and compares the real alternatives, including a do-it-yourself webhook to Slack.

Disclosure: Weir, which publishes this blog, is ours. It's the DIY option at the end. For plenty of people F5Bot or one of the hosted tools below is the better choice, and we say where.

How F5Bot works in 2026

From f5bot.com, its FAQ and its matching docs:

• Sources: Reddit, Hacker News and Lobsters. "F5Bot checks for new content every few minutes."
• What it matches: "Keywords match on submission titles, URLs, and comment bodies. They do not match on posters' usernames." Matching isn't case-sensitive, and there's no fuzzy matching or regex.
• Flags: you can restrict or exclude by site, subreddit (only-subreddit=, no-subreddit=), posts or comments, and URL. Keywords of three characters or less must use the whole flag. Boolean flags (exclude=, include-any=, include-all=) are for paid plans.
• Built for rare terms. The FAQ is upfront: "F5Bot is designed to alert you about fairly uncommon keywords or phrases. If you're trying to monitor a very popular brand, this might not be the right tool for you."

F5Bot isn't only a free tool any more. The tiers page lists, as of October 2026:

Two rules explain most complaints. First, "A keyword that goes over its limit will be disabled", where the limit is that per-keyword daily cap. Second, "Free accounts cannot monitor very common words or phrases." AI filtering on Gold and Platinum includes the first $10 a month of token usage, and usage beyond that is billed on top.

Many comparison posts still describe F5Bot as email-only with no Slack or API. That's out of date: Slack, Discord, feeds and an API exist now, on the paid tiers.

What people want that F5Bot doesn't do

We read recent Reddit and X threads about F5Bot (using Weir's own search, small samples). The praise is consistent: it's free and takes a minute to set up, and founders keep recommending it as the first step for finding conversations to join. The wishes cluster into a few themes.

Fewer irrelevant matches. Exact keywords catch every joke and passing mention, and miss posts that describe your problem in other words. One commenter in a r/SideProject thread about an F5Bot alternative put it as "you end up either missing the frustrated users entirely or drowning in false positives from people just mentioning the product name."

AI filtering is the usual answer, but it has its own failure mode. Someone who works on Syften noted in the same thread that "the hard part is making false negatives visible": when an AI-filtered alert stays quiet, you can't tell whether nothing happened or the filter threw away something good.

Popular terms. Tracking a well-known brand or a common word hits the daily cap and the keyword gets disabled. That's by design, as F5Bot says.

Delivery somewhere other than email, and X coverage. Slack starts at $49.99 and webhooks at $214.99, and F5Bot doesn't cover X at all.

Confidence it will keep working. On X, a developer asked in October 2026 whether F5Bot is "still operational" given that Reddit has restricted its free API. It is, as far as its site shows. But that question applies to every tool here; see the caveat below.

The alternatives

Prices are as of October 2026, from each vendor's own page.

Syften

Syften is the closest like-for-like upgrade. It covers Reddit, Hacker News, Lobsters, forums, GitHub, Stack Exchange, Slack communities, newsletters, podcasts, Bluesky and more, with X ($40) and YouTube ($20) as add-ons. Entry is $29.95 a month for 3 community filters, Standard is $49.95 for 20 filters with Slack and AI filtering, and PRO is $119.95 for 100 filters with webhooks and MCP. For Reddit it says "we aim for at most a 1-minute delay." The trial is 14 days on PRO, no card.

Choose it if you want F5Bot's job done across many more communities, with filtering and Slack, and can pay $50 a month.

KWatch.io

KWatch.io covers Reddit, Hacker News, X, YouTube, Facebook and LinkedIn. The free plan has 2 Reddit and 2 Hacker News keywords. Paid plans are $19 (20 Reddit keywords, 2 X keywords), $79 (100 Reddit keywords, with Slack, webhooks, API and MCP) and $199. It says notifications should arrive "within a couple of seconds", and it can also track new comments in a chosen Reddit or HN thread.

Choose it if you want speed and some X and LinkedIn coverage at a low price. Note that webhooks start at $79.

Octolens

Octolens is built for B2B marketing and developer-relations teams. Pro is $159 a month billed annually, for 10 keywords and 15,000 mentions, refreshed hourly, with AI relevance scoring, Slack, email, API, webhooks and an MCP server. Scale is $499 billed annually, with real-time refresh and podcasts, news and newsletters. There's a 7-day trial.

Choose it if you're a team that wants AI to rank mentions by relevance to your business across Reddit, X, LinkedIn, Hacker News, GitHub and more.

Google Alerts

Free, but a weak fit for Reddit. Google's help page describes it as emails "when new results for a topic show up in Google Search." So it only sees Reddit pages after Google indexes them, a single comment is rarely a search result of its own, and a thread can be over before it's indexed. Use it for news and blogs, not as a Reddit alert.

Paid social listening (Brand24 and similar)

Brand24 monitors social networks, news, blogs, podcasts and Reddit, with sentiment analysis. It starts at $249 a month ($199 billed annually) for 3 keywords, 2,000 mentions and updates every 12 hours; real-time updates start at $499. That's the right tool for PR and brand teams that need the whole web. For Reddit keyword alerts alone it's expensive.

DIY with an API and a webhook

If you want alerts in your own code, or want Reddit and X in one feed, you can build it on an API. This is where Weir fits. It's also where Weir is weakest for this particular job, so read the limits below before choosing it.

Comparison table

A minimal Weir monitor that posts to Slack

Weir's monitors run on a schedule and send only new results to a signed webhook. Slack's incoming webhooks expect a body like {"text": "..."} (Slack docs), and Weir sends its own signed payload, so you put a small relay in between. The full walkthrough, with a Node receiver and cost maths, is in Build a Reddit and X brand mention monitor. Here's the short version.

1. Create the webhook. The response's data includes the id and a secret that is shown once:

curl --request POST \
  --url https://api.weirapp.io/v1/webhooks \
  --header "Authorization: Bearer $WEIR_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{
    "name": "Reddit alerts to Slack",
    "url": "https://your-relay.example.com/weir",
    "events": ["monitor.result.created"]
  }'

2. Create the monitor. Reddit's search doesn't cover comment text, so for F5Bot-style comment alerts use a subreddit_comments target. It reads the communities' newest comments and keeps those matching query, which takes quoted phrases, -exclusions and OR. You can join up to ten communities with +:

curl --request POST \
  --url https://api.weirapp.io/v1/monitors \
  --header "Authorization: Bearer $WEIR_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{
    "name": "Invoicing pain in comments",
    "target": {
      "kind": "subreddit_comments",
      "subreddit": "smallbusiness+freelance+Bookkeeping",
      "query": "\"invoice software\" OR \"invoicing tool\" -hiring"
    },
    "schedule": "daily",
    "webhookId": "PASTE-THE-WEBHOOK-ID"
  }'

For posts anywhere on Reddit, plus X, use {"kind": "search", "query": "...", "sources": ["reddit", "x"]} instead.

3. Run the relay. It verifies the signature over the raw body, then forwards each item to Slack. A Reddit comment arrives in Reddit's own shape (body, subreddit, permalink), a Reddit post has title and url, and an X post has text and url:

import hashlib
import hmac
import os
import time

import requests
from flask import Flask, abort, request

app = Flask(__name__)
SECRET = os.environ["WEIR_WEBHOOK_SECRET"].encode()
SLACK_URL = os.environ["SLACK_WEBHOOK_URL"]


def valid(raw: bytes, signature: str, timestamp: str, event_id: str) -> bool:
    try:
        if abs(time.time() - int(timestamp)) > 300:
            return False
    except ValueError:
        return False
    expected = hmac.new(SECRET, f"{timestamp}.{event_id}.".encode() + raw, hashlib.sha256).hexdigest()
    return hmac.compare_digest(expected, signature)


@app.post("/weir")
def weir():
    raw = request.get_data()
    h = request.headers
    if not valid(raw, h.get("weir-signature", ""), h.get("weir-timestamp", ""), h.get("weir-event-id", "")):
        abort(400)
    event = request.get_json()
    for item in event.get("data", {}).get("results", []):
        if "body" in item:  # a Reddit comment
            line = f"r/{item['subreddit']}: {item['body'][:200]}\n{item['permalink']}"
        elif "subreddit" in item:  # a Reddit post
            line = f"r/{item['subreddit']}: {item['title']}\n{item['url']}"
        else:  # an X post
            line = f"@{item['author']['username']}: {item['text'][:200]}\n{item['url']}"
        requests.post(SLACK_URL, json={"text": line}, timeout=5)
    return "", 200

In production, deduplicate on weir-event-id (deliveries are at least once) and reply within 10 seconds, moving the Slack calls to a queue if there are many. POST /v1/webhooks/{id}/test sends a free signed test delivery. Details are in the monitor docs.

Where this is worse than F5Bot, honestly

• It isn't sitewide for comments. F5Bot scans comments across all of Reddit. A Weir comment monitor watches the communities you name, at most ten per monitor.
• It's slower. The fastest schedule is hourly, and that needs a paid tier (any $5 purchase). The free tier gets one monitor and one webhook, on daily or weekly schedules.
• Busy communities can overflow. A keyword comment monitor reads up to about 300 of the newest comments per run, so a community with more comments than that between runs loses the oldest ones. Use it for smaller communities, or run hourly.
• You run the relay. F5Bot Gold posts to Slack with no code.

What you get in return: Reddit and X in one monitor, results deduplicated by content, signed webhooks into any system, and per-result pricing. A comment costs 3 credits and each run has a 1-credit minimum, so a daily run finding 5 matching comments costs 16 credits, about 480 a month, inside the 5,000 free credits.

The caveat for every Reddit alert tool

Every tool in this post depends on access to Reddit, and as far as public information shows none of them, Weir included, has a licence from Reddit, so any of them can be affected if Reddit changes how its data can be reached. RSS feeds, the old free route to alerts, are already ending; see Reddit RSS feeds are ending. Prefer monthly plans, and keep your keyword lists somewhere you control. If you store what you collect, check Reddit's terms and your privacy obligations; this isn't legal advice.

How to choose

• A few uncommon keywords, email is fine: stay on F5Bot's free plan.
• More keywords and Slack, Reddit plus other communities: Syften, or F5Bot Gold if you only need Reddit, HN and Lobsters.
• Fast alerts with some X and LinkedIn, on a budget: KWatch.io.
• A B2B team that wants AI relevance scoring: Octolens.
• Brand monitoring across the whole web: Brand24.
• Alerts in your own code, Reddit and X together: an API with webhooks, such as Weir. Other APIs are compared in the best Reddit API alternatives.

If you're coming from GummySearch rather than F5Bot, GummySearch alternatives covers research and lead-finding tools too.

Doing it with Weir

Create an account for 5,000 free credits a month, no card. Then follow Monitors and webhooks. Rates and packs are on pricing, and every response's x-credits-charged header shows what a call cost.

Sources

• F5Bot homepage: https://f5bot.com/
• F5Bot tiers: https://f5bot.com/tiers
• F5Bot FAQ: https://f5bot.com/faq
• F5Bot keyword matching and flags: https://f5bot.com/docs
• r/SideProject thread on F5Bot alternatives (comments): https://www.reddit.com/r/SideProject/comments/1r7c2do/i_built_an_alternative_to_f5bot_that_works_with/
• Syften pricing: https://syften.com/pricing
• KWatch.io pricing: https://kwatch.io/pricing
• Octolens pricing: https://octolens.com/pricing
• Google Alerts help: https://support.google.com/alerts/answer/4815696?hl=en
• Brand24 pricing: https://brand24.com/prices/
• Slack incoming webhooks: https://docs.slack.dev/messaging/sending-messages-using-incoming-webhooks
• Weir docs, Monitors and webhooks: https://docs.weirapp.io/monitors