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
389,972
390K
Online now
—
not captured in the last snapshot
Posts per day
5.2
from the last 100 posts, spanning 19.1 days
Comments per post
—
no sample yet
Growth · 7d
—
not enough history yet
Growth · 30d
+2.1%
+8K members · ≈37d
Promo tolerance
—
not assessed yet
Last post
Oct 18
sampled Oct 19
Distinct posters
95%
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
Similar by content
Communities that discuss what r/opensource discusses.
We are dedicated to the discussion of Free and Open Source Software, or FOSS.
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.
A cozy safe place to discuss all things open source for AI!
Community for open-source AI — open weights, open data, open tooling. Model releases, fine-tuning, inference, agents, benchmarks, licensing, and the ecosystem around building AI in the open.
See the full lists on similar subreddits.
r/opensource — frequently asked
How many members does r/opensource have?
r/opensource has 389,972 members as of our most recent crawl on Oct 19. 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?
Over the last ≈37 days r/opensource changed by +2.1% — a gain of 8K members. We compare against the nearest snapshot we actually hold and state the real span rather than rounding it to a clean "30 days".
How active is r/opensource?
Around 5.2 posts per day, measured from the newest 100 posts on Reddit, which span 19.1 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, 95% came from distinct accounts; the newest was published Oct 18. 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
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