How to Set Up Reddit Alerts for Your Startup

The quickest way to set up Reddit alerts for your startup is a free keyword alert tool such as F5Bot. You type in the words you want to watch plus an email address, and it emails you when one shows up in a new Reddit post or comment. The catch is that a brand-name alert only tells you a word appeared. It does not tell you someone wants to buy, so the keywords you pick matter more than the tool.

Prices and limits below come from review sites and were last looked at on October 3, 2026. I read search summaries, not the full pages, so check the numbers on the tool's own site before you rely on them.

What a Reddit alert actually does

A keyword alert watches new posts and comments for a word or phrase and sends you a message when it finds one. That is all. It does not read the thread, judge the person, or decide whether a reply is a good idea.

That sounds obvious, but it explains most of the frustration people have with alerts. Set one up for your company name and you will hear about every mention. Set one up for a broad word like "invoice" or "scheduling" and you will get a pile of casual chat. The tool did its job. The setup was the problem.

Step 1: Pick a tool

For a startup with no budget, F5Bot is the usual starting point. Per the tool's own guide, it watches Reddit, Hacker News and Lobsters for your keywords and emails you when they appear. Reviewers call the free plan enough for basic brand-name tracking. One says alerts usually arrive within minutes, while others list a delay of about two hours on the free plan.

The free plan has limits. According to a review on listeningplatforms.com and similar roundups, you get 5 keywords, about 20 alerts a day, delivery in roughly two hours, and a small ad in each email. MakerStack's review covers the paid tiers too: Silver is listed at $9.99 a month for 20 keywords and about 5-minute delivery, and Gold at $49.99 a month for 200 keywords and AI filtering.

Two cautions. First, several of these review sites sell or promote rival tools, so they have a reason to stress the limits. Second, one comparison source says the free plan is marked "personal use only" on F5Bot's pricing page. I could not confirm that wording. If you plan to run a business on the free tier, read F5Bot's own terms first.

F5Bot is a good tool. If all you want is to hear when your name comes up on a zero budget, it is a fair place to start.

Step 2: Choose keywords that catch buyers, not just mentions

This is the step most guides skip, and it is the one that decides whether your alerts are useful.

Think about who you want to hear from. The person asking "what do you all use for X?" often has never heard of your company. If you only track your brand name, you will miss them completely. Tool vendors who write about this suggest watching the phrases a buyer types while looking, such as "anyone recommend", "looking for a tool that", "alternative to" and "what do you use for". Those lists come from vendors, not from a test, so treat them as common phrasing and try them yourself.

Here is a starter set, in three groups:

With only 5 free keywords, spend them on purpose. One possible split: two request phrases, one comparison phrase, one problem phrase and one brand name. That split is a suggestion, not a tested formula. Change it after the first week.

A broad keyword can also eat your daily alert cap. If the free plan stops at about 20 alerts a day, one loose phrase can fill the quota before a good thread appears. Narrow phrases protect you from that.

Step 3: Narrow it to the right subreddits

Keyword-only alerts surface every mention, including off-topic ones, and vendors who sell monitoring tools say most mentions are casual discussion, not buying. One way to cut that is to limit a monitor to the few subreddits where your buyers ask for help or compare tools.

Before you set anything up, write down 3 to 5 subreddits where your buyers actually post. Look for places where people ask questions, not places where people just share news. Check whether the free tool you picked lets you filter by subreddit. F5Bot lists filtering by subreddit as a paid feature, per its own pages. If your tool does not filter, you can do it by eye: skim the subreddit name in each alert and ignore the rest.

Step 4: Run a one-week test

Do not trust your first keyword list. Test it.

1. Set your 5 keywords and leave them alone for a week.
2. For each alert, mark it one of three things: ready to buy, chatting, or off topic.
3. At the end of the week, count the marks for each keyword.
4. Drop any keyword that was mostly off topic. Tighten any that was mostly chatting. Keep the ones that gave you even one real buyer.

I am not giving you a target number of alerts or a success rate, because I do not have one and none of the sources do either. Your test is the only data that counts here. It should not take long each day.

Step 5: Decide what to do with each alert

An alert is a prompt to look, not to reply. When one lands, ask three quick questions:

• Is the person asking for options right now?
• Is the thread recent enough that a reply will still be read?
• Does the subreddit allow the kind of reply you would write?

If the answer to any of them is no, skip it. If all three are yes, read the whole thread, then write a reply that helps first. If you are not sure how to mention your own product, the guide on how to mention your product in a Reddit reply without sounding like an ad covers the wording. And if your account is new, read how long to warm a new Reddit account before you mention anything you sell.

A made-up example

Say you run a small invoicing tool. These alerts are invented, to show the process:

Only two of the five get a reply. That is normal and it is the point of the one-week test: you learn which words earn your attention.

When free alerts stop being enough

A free alert is a good start, and for many founders it is enough for a while. It stops being enough in a few situations.

• Speed. If the free tier delivers in about two hours, a thread can be well underway by the time you see it.
• Coverage. Your buyers may not be only on Reddit. They might ask on X, LinkedIn, Hacker News or Bluesky too.
• Sorting. Reading every alert yourself takes time you may not have.

Outposts is built for that second stage. It watches nine networks for conversations that show buying intent, then drafts a reply in your voice. You copy it and post it yourself from your own account. It never signs in to your accounts, so the risk of a ban is reduced, not removed. It is not free and it is not a cheaper F5Bot: the Solo plan is $39 per venture per month (US dollars) for seven networks, and Pro is $99 for nine. If you only want a note when your name comes up, a free alert will do that.

If you want to see what a search finds before paying, a free brief takes about a minute and needs no card. For a wider look at the options, F5Bot alternatives: when to stay and what to pick when you outgrow it walks through the choices without repeating this article.

Where to go from here

Set up your five keywords today, run the week of marking alerts, and cut the ones that waste your time. Once the alerts are clean, you will know which threads are worth a reply and which are not.

If you want to see real conversations from your own market before you set anything up, Get my free brief. Paste your URL and you get results in about a minute.