The best Reddit monitoring tool depends on what you do after the alert. F5Bot is a free keyword tripwire. Syften has the fastest alerts across many communities. Octolens scores mentions and feeds them into your own stack. RedShip and Subreddit Signals send a short daily list of Reddit threads with drafts you post yourself. We checked every price and alert channel below on the vendor's own site on 12 November 2026.
Disclosure: our own app is in this list. It is labelled as ours and listed last, and we have not ranked it.
At a glance
| Tool | Price a month, checked 12 Nov 2026 | Alerts | Speed, as the vendor states it | Platforms | Who posts replies |
|---|---|---|---|---|---|
| F5Bot | Free. Silver $12.99. Gold $49.99 | Email. Slack, Discord, RSS and JSON on Gold | Not stated | Reddit, Hacker News, Lobsters | You. It only alerts |
| Syften | Entry $29.95. Standard $49.95. PRO $119.95. 14-day trial, no card | Email, Slack, RSS, API, webhook | "At most a 1-minute delay" on Reddit | Reddit, Hacker News, X, Bluesky, Mastodon, GitHub, YouTube, Stack Exchange and more | You |
| Octolens | Pro $159, Scale $499, both billed yearly. 7-day trial, no card | Slack and email, plus API, webhooks and MCP | Hourly on Pro, real time on Scale | Socials and community platforms, plus news and podcasts on Scale | You |
| RedShip | Founder $29. Company $49. $12 for a 7-day pass | Email and Slack. Webhooks on Company | Checks Reddit every morning | You, "in your own words" | |
| Subreddit Signals | Starter $29. Pro $59. 14-day trial, card required | In-app feed, email digests, Slack on Pro | Not stated | You. It "does not auto-post replies" | |
| Ours: Reddit monitoring app | Starter $49. Done for you $299. 7-day trial, card required | Email, Slack, Telegram | Not stated here | Starter: you. Done for you: you, or us through our established accounts |
Syften also sells X monitoring for $40 a month and YouTube for $20 on top of a plan. Octolens's pricing page did not show separate monthly-billed prices when we read it.
F5Bot: the free Reddit monitoring tool
F5Bot emails you when your keyword shows up on Reddit, Hacker News or Lobsters. The free tier needs no card. Silver ($12.99) gives you 20 keywords and full post text. Gold ($49.99) gives you 200 keywords, AI filtering and Slack or Discord. It does not score threads for fit or help with replies. For most people it is the right first tool, and it's also the one they outgrow. The F5Bot alternative page covers when that happens.
Syften: fast alerts across many communities
Syften is the broadest of the cheap options. It watches Reddit plus a long list of other communities, and aims for "at most a 1-minute delay" on Reddit. The entry plan allows only 3 community filters, so most teams end up on Standard at $49.95 for AI filtering and Slack. Webhooks and MCP are on PRO. It does not draft replies. More on the Syften alternative page.
Octolens: a Reddit listening tool for your own stack
Octolens is a social listening tool that covers Reddit too. Every plan includes the API, webhooks and an MCP server, plus Slack and email alerts and AI filtering. Pro refreshes hourly and Scale in real time. It is the most expensive tool here, from $159 a month billed yearly. The Syften vs Octolens page compares the two in detail.
RedShip: a daily shortlist of threads
RedShip reads your site, suggests keywords and checks Reddit every morning. It scores threads 0 to 100, sends them to your inbox and suggests replies you post yourself. Founder at $29 covers one product and 10 keywords. Company at $49 covers three products and 30 keywords, and adds webhooks.
Subreddit Signals: intent-ranked threads and drafts
Subreddit Signals ranks posts by buyer intent and drafts a reply from a voice profile. Its site says you "post from your own Reddit account" and that it "does not auto-post replies". Starter ($29) covers one brand and 10 subreddits. Pro ($59) covers five brands and 25 subreddits, with Slack alerts for high-scoring leads. It also sells a managed service from $2,000 a month.
Our Reddit monitoring app
Subreddit Marketing's Reddit monitoring app watches the subreddits and keywords you pick, ranks each thread by how well it fits your product, and drafts a reply in your voice. Alerts go to email, Slack or Telegram. On Starter ($49) you edit the draft and post it from your own account. On Done for you ($299) you can also have us post through our established accounts using monthly credits, and you can add upvotes and autopilot. Both plans are on the pricing page.
How to pick a Reddit monitoring tool
| If you need | Start with |
|---|---|
| A free alert when a word appears | F5Bot, or our free Reddit keyword alerts |
| Speed and many communities in one feed | Syften |
| Mentions as data in Slack, a CRM or your own agent | Octolens |
| A short list of Reddit threads each morning, with reply drafts | RedShip or Subreddit Signals |
| Threads ranked by fit and drafts, with the option to have replies posted for you | Ours |
Watch the noise. Alerts take minutes to set up and a lot more work to keep useful. Whichever Reddit monitoring tool you pick, start with a few tight keywords and a short list of subreddits, then widen. To see what users say about each tool in their own words, read the Reddit marketing tools ledger and our note on why alerts are not the same as leads.