Where CRO practitioners share real test results, not just best practices.
Conversion rate optimization sits at the intersection of statistics, design, and copywriting, and Reddit is one of the few places all three disciplines argue in the same thread. A CRO practitioner posting here might get a methodology critique from a data analyst, a headline rewrite from a copywriter, and a layout suggestion from a UX designer, often on the same test. The subreddits below range from the dedicated CRO community focused on test design and statistical significance, to platform-specific spaces where ecommerce and Shopify merchants troubleshoot the exact page elements costing them sales. What ties them together is a preference for real numbers over best-practice checklists.
Written by the GrowReddit team
This guidance reflects how our team actually works on Reddit. We research subreddits by hand, read each community's posting rules and moderator guidelines before recommending it, and spend time reading threads to understand the tone and what genuinely earns upvotes. Our recommendations favour community-first participation, useful posts and honest comments, over promotional shortcuts. Subreddit rules change, so re-read a community's current rules before you post.
Dedicated CRO community covering A/B testing, landing pages, user research, funnel analysis, and experimentation culture. Practitioners share real test results and discuss methodology.
Best content types
Posting tip
Post actual test results with statistical significance, sample size, and what you expected vs what happened. The surprises drive the best discussions.
Analytics professionals discuss data collection, interpretation, and conversion analysis. Strong overlap with CRO in GA4, funnel analysis, and attribution discussions.
Best content types
Posting tip
Technical implementation questions with screenshots of what you are seeing get the most useful responses.
Landing pages are a core topic here. PPC practitioners are obsessed with post-click conversion, making this community an excellent source of landing page optimisation discussions.
Best content types
Posting tip
Combine PPC metrics with landing page data. CTR, conversion rate, CPC, and ROAS in a single post tells the full story.
Business owners discuss conversion optimisation in the context of business growth. Less technical than specialist CRO communities but useful for connecting CRO to revenue outcomes.
Best content types
Posting tip
Frame CRO in revenue terms, "This A/B test added $20k/month in revenue" drives much more engagement than technical methodology posts.
Design-led conversion improvements, UX heuristics, and usability testing methods relevant to CRO. Covers the design side of what makes pages convert.
Best content types
Posting tip
Before-and-after design comparisons with conversion data attached are the highest-performing posts in this community.
General home for online store operators discussing platform choice, checkout flow, and the conversion mechanics specific to selling physical or digital products online. Cart abandonment, product page structure, and payment friction come up constantly, all core CRO territory for retail.
Best content types
Posting tip
Post your actual checkout funnel drop-off numbers when asking for feedback; vague 'why isn't my store converting' threads get ignored while specific step-by-step funnel breakdowns get real answers.
The largest platform-specific storefront community, where merchants troubleshoot conversion problems tied to specific themes, apps, and checkout customizations. Threads frequently include before-and-after conversion rate numbers after a theme or app change.
Best content types
Posting tip
Name your theme and installed conversion apps when asking for help; this audience diagnoses issues by stack, not generic advice.
Professional and hobbyist copywriters dissect headlines, calls to action, and persuasive structure, the language layer of conversion rate optimization that pure data-and-design discussions miss. Direct response principles get argued over in detail here.
Best content types
Posting tip
Paste the actual copy in the post body, not just a link; this community's own rules discourage naked links and its critique style needs the text in front of them line by line.
Growth-focused marketers and founders share experiments across the full funnel, with conversion rate work as one lever alongside acquisition and retention tactics. Threads often report specific percentage lift from a single test.
Best content types
Posting tip
State the baseline conversion rate and the lift you measured; unverified 'this changed everything' claims without numbers get called out fast.
CRO communities are statistical in nature, generic best practices will be challenged unless you have data. Always lead with your hypothesis, test structure, and results. The community is excellent for methodological discussions: when is a test significant, how do you handle multiple testing problems, how do you prioritise the testing roadmap. The best contributors share their failures as generously as their wins.
r/CRO (70k+ members) is the most focused community, but strong complementary discussions appear in r/analytics (for data methodology), r/PPC (for landing page optimisation), and r/UXDesign (for design-driven conversion improvement). Experienced CRO practitioners typically monitor all of these.
r/CRO regularly features A/B test case studies with results. The community values statistical rigour, sharing confidence intervals and sample sizes is expected. r/PPC also has A/B testing discussions focused specifically on ad and landing page experiments.
r/ecommerce covers conversion optimisation specific to online retail, including checkout optimisation, product page tests, and cart abandonment strategies. r/Shopify is the best community for Shopify-specific CRO discussions, with threads on conversion apps, checkout customisation, and theme optimisation.
r/copywriting is the best fit for the language side of CRO: headline structure, calls to action, and how offer framing affects conversion, discussed by writers rather than designers or analysts. It pairs well with r/CRO, where the same page might get a statistical read on a test while r/copywriting critiques the words driving the click. For ecommerce specifically, r/ecommerce and r/Shopify carry ongoing threads about product page and checkout copy tied to real conversion numbers.
Closely related topics, plus the matching industry playbook if you're picking subreddits with a buyer in mind.
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Open Regional playbookIndia-focused playbook covering subreddit norms and buyer behaviour.
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