A live heatmap of when r/startups's top 100 posts of the past year were submitted. The brightest cells are the windows when this community engages most.
Analyze a different subredditr/startups has one of the most internationally distributed audiences on Reddit, with strong daytime activity across both US and European business hours (12:00-22:00 UTC). The 'evening US, morning Europe' overlap window (around 21:00-23:00 UTC) is consistently strong. Avoid late US weekend nights when activity drops sharply. The subreddit's algorithm rewards posts that sustain engagement over hours, not minutes — early-evening UTC posts tend to outlast same-day late-night ones.
Times above are UTC — the heatmap reflects the trailing 12 months of top posts, so it captures long-term patterns rather than this week's activity. Have questions about how this works? See the main tool page for FAQs.
Knowing when to post is the easy part. ReplyMine surfaces the threads in r/startups(and the rest of Reddit) where someone is actively asking for what you sell.
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