r/whatsthatbook
Can't remember the title of the book you've enjoyed reading? Crowdsource it to readers on Reddit!
Members
339,076
339K
Online now
—
not captured in the last snapshot
Posts per day
—
no sample yet
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
—
no sample yet
Distinct posters
—
no sample yet
Tracking since Aug 18 · 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 Aug 18 — growth charts appear after a week of history.
Similar by content
Communities that discuss what r/whatsthatbook discusses.
Just providing recommedations on books readers would love!!
A place to share and discuss book reviews. Write your own reviews, share professional and amateur book reviews from elsewhere, and discuss the reviews posted.
A reddit for fans of comic books, graphic novels, and digital comics.
Having trouble finding the subreddit or community you need? Post what you're looking for here and someone can suggest a community for you!
r/AskReddit is the place to ask and answer thought-provoking questions.
See the full lists on similar subreddits.
r/whatsthatbook — frequently asked
How many members does r/whatsthatbook have?
r/whatsthatbook has 339,076 members as of our most recent crawl on Aug 18. 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/whatsthatbook growing?
We don't have 30 days of snapshot history for r/whatsthatbook yet, so we're not going to invent a growth number. We've been tracking it since Aug 18; the chart fills in as history accumulates.
How active is r/whatsthatbook?
We don't have a reliable posting-rate sample for r/whatsthatbook yet. Subscriber count alone is a poor guide to whether a community is active, so treat this one as unverified until the next sample lands.
Can I promote my product in r/whatsthatbook?
We don't have a promo-tolerance read for r/whatsthatbook 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/whatsthatbook for mentions?
Hit Watch on this page. Prowlo starts crawling r/whatsthatbook 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/whatsthatbook's stats?
Yes. Everything on this page is one MCP tool call away: catalog_get_subreddit returns r/whatsthatbook'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