How to Get Notified When Someone Posts on Reddit

You can get push notifications for new Reddit posts by using a third-party app like Watch My Subs, which checks your chosen subreddits every 30 seconds and sends an alert the moment something new appears.

Why Reddit's Built-In Notifications Fall Short

Reddit has a notification system, but it's built around engagement — upvotes, comments, replies to your posts. What it doesn't do is alert you when someone else posts something new in a subreddit you care about.

That's a real gap. If you're watching a deal subreddit for a specific item, tracking a local community board for new listings, or monitoring an industry subreddit for breaking news, you're stuck refreshing manually or checking in periodically and hoping you didn't miss anything.

For a lot of use cases — especially time-sensitive ones — that isn't good enough.

How Third-Party Subreddit Notification Apps Work

Apps like Watch My Subs fill this gap by polling Reddit's API on a regular interval. Instead of relying on Reddit to push data to you, they actively check for new posts every 30 seconds or so. When something new shows up, they send a push notification to your phone.

The smarter ones also let you filter by keyword. So rather than getting pinged every time anything is posted to r/buildapcsales, you can say "only notify me if the title contains 'RTX 4070'." That's the difference between an app that's useful and one that drowns you in noise.

Watch My Subs does both: rapid polling plus keyword filters, so you get notified only when something actually relevant to you gets posted.

Setting Up Reddit Post Alerts Step by Step

If you're using Watch My Subs, the setup takes about two minutes:

1. Download the app from the App Store
2. Add a subreddit — type in the name (e.g. buildapcsales, hardwareswap, StockMarket)
3. Add keyword filters if you want to narrow it down (optional, but recommended for busy subs)
4. Enable notifications when the app prompts you

After that, you'll get a push notification on your iPhone whenever a new post matches your criteria. The app checks every 30 seconds, so you're rarely more than half a minute behind.

Who Actually Needs This

The people who get the most value from subreddit alerts tend to fall into a few groups:

• Deal hunters watching r/buildapcsales, r/GameDeals, or r/frugalmalefashion for specific items
• Investors and traders tracking stock ticker mentions in subreddits like r/wallstreetbets or r/investing
• Local community watchers monitoring housing, job, or event listings in city-specific subs
• Content creators and researchers keeping tabs on mentions of a topic or competitor in niche communities
• Collectors watching buy/sell subs for rare items (sneakers, vinyl, trading cards, etc.)

For all of these, being first matters. The best deals sell in minutes. Breaking news is worth more when it's actually new.

Frequently Asked Questions

Does Reddit have its own notification system for new posts?

Reddit sends notifications for replies, mentions, and activity on your own posts, but not for new posts by other users in subreddits you follow. For that, you need a third-party app that monitors subreddits on your behalf.

How fast are the notifications?

Watch My Subs checks subreddits every 30 seconds, so you'll typically get a notification within half a minute of a post going live. For most use cases — deal hunting, news tracking, stock mentions — that's fast enough to act on.

Can I filter alerts so I'm not spammed?

Yes. You can add keyword filters to any subreddit you're monitoring. If a new post doesn't contain your keyword in the title, you won't get notified. This is especially useful for high-volume subreddits where you only care about specific items or topics.