r/opensource
Open Source on Reddit
Founded January 2008 · Public — anyone can post
A subreddit for everything open source related (for this context, we go off the definition of open source here http://en.wikipedia.org/wiki/Open_source)
Members
381,976
382K
Online now
—
not captured in the last snapshot
Posts per day
5.0
from the last 100 posts, spanning 19.8 days
Comments per post
—
no sample yet
Growth · 7d
—
not enough history yet
Growth · 30d
—
not enough history yet
Promo tolerance
—
not assessed yet
Last post
Sep 12
sampled Sep 12
Distinct posters
87%
of the last 100 posts
Tracking since Sep 12 · growth spans are the real distance between snapshots, not rounded windows. Posts/day is measured from the community’s own newest posts on Reddit, not from what Prowlo happens to crawl.
Member growth
Tracking since Sep 12 — growth charts appear after a week of history.
Similar by content
Communities that discuss what r/opensource discusses.
A sub for posting and finding Open Source projects whose primary goal is contributing to good causes directly benefitting humanity, animals, or our planet. The stickied post at the top here is from our 'Monthly Reddit Hacks' where our community combine together to build something new together, or push a great project to meet a big milestone.
OpenAI Sub specifically for developer related topics and talks.
A subreddit for all questions related to programming in any programming language (Contributions are only allowed in English!).
See the full lists on similar subreddits.
r/opensource — frequently asked
How many members does r/opensource have?
r/opensource has 381,976 members as of our most recent crawl on Sep 12. Prowlo re-checks tracked communities on a rolling schedule, so this figure moves rather than sitting frozen at whatever it was when a scraper last ran.
Is r/opensource growing?
We don't have 30 days of snapshot history for r/opensource yet, so we're not going to invent a growth number. We've been tracking it since Sep 12; the chart fills in as history accumulates.
How active is r/opensource?
Around 5.0 posts per day, measured from the newest 100 posts on Reddit, which span 19.8 days. Posting rate matters more than subscriber count when you're deciding where to spend your time — it determines how long your comment stays visible.
When was r/opensource created?
r/opensource was founded in January 2008 and is a public — anyone can post community. Age matters: an older community with steady growth has survived Reddit's moderation churn; a young one with a spike may not.
Who posts in r/opensource?
Of the last 100 posts we sampled, 87% came from distinct accounts; the newest was published Sep 12. A low share means a feed dominated by a handful of accounts (bots, mods, or one prolific poster) rather than a community.
Can I promote my product in r/opensource?
We don't have a promo-tolerance read for r/opensource yet. Default to the safe approach: read the sidebar rules, contribute in threads where you gain nothing, and mention your product only when it is the honest answer to someone's question.
How do I monitor r/opensource for mentions?
Hit Watch on this page. Prowlo starts crawling r/opensource into your Dataset — every new post indexed and embedded, searchable semantically, queryable by your AI agent over MCP, and able to trigger keyword alerts in Slack. Prowlo is read-only; it never posts on your behalf.
Can my AI agent read r/opensource's stats?
Yes. Everything on this page is one MCP tool call away: catalog_get_subreddit returns r/opensource's members, growth, promo tolerance and similar communities as typed JSON — free, no credits. Connect your agent to api.prowlo.com/mcp and it can vet the community and start watching it in the same conversation.
Read-only · Human-in-the-loop
Prowlo never posts for you