Your Meta CPMs have climbed every quarter for three years. Most founders have stopped noticing, because the rise is gradual and the ROAS target quietly gets adjusted to match.
What’s in This Article
Here is a number worth sitting with. Ecommerce campaigns on Reddit are running CPMs of roughly US$2 to US$8. Comparable Meta audiences sit at US$10 to US$20 and above. Reported CPAs come in 15 to 40% lower than Facebook and Instagram for similar products. That is not a rounding difference. That is the same impression at a third of the price.
Most Aussie operators dismiss Reddit because they remember it as a forum full of people who hate advertising. That was a fair read in 2019. In the second quarter of 2026 Reddit booked US$762 million in ad revenue, up 64% year on year, and performance ads now make up more than 60% of that total. Reddit is a working performance channel. Almost no Australian DTC brands are running on it properly.
That gap is the opportunity. Below is the six-part system for testing Reddit on a Shopify store, including the tracking setup that decides whether your test tells you the truth.
Why Reddit Behaves Nothing Like Meta
If you run Reddit the way you run Meta, it will not work and you will conclude the channel is broken. The two platforms sell different things.
Meta sells interruption. You buy attention from someone scrolling with no particular intent, and the creative has to manufacture the want. Reddit sells context. People arrive at a subreddit already deep in a topic, often mid-research, frequently asking other humans what to buy.
That changes the maths. Reddit is currently at roughly 1.48 billion monthly active users and 130.3 million unique daily users, growing about 18% year on year. Australia accounts for around 3.9% of Reddit users. On raw reach it will never beat Meta here. On intent density inside a niche community, it regularly wins.
It also changes what good looks like. Baseline click-through rates on Reddit sit between 0.2% and 0.8%, with 1% or better signalling genuinely strong niche creative. If you walk in expecting Meta-style CTRs you will kill winning ad sets on day four.
- Meta wins on cold reach, broad prospecting and creative volume testing.
- Reddit wins on considered purchases, research-heavy categories and products people actively ask for recommendations on.
- Reddit loses on impulse buys, low-consideration commodities and anything with no existing community conversation.
Run the honest test before you spend anything. Search your product category on Reddit and read the last three months of posts. If people are asking “what should I buy” in your category every week, you have a channel. If the search turns up nothing, spend the money on Meta and come back in a year.
Part 1: Build the Community Map Before You Build a Campaign
The single biggest reason Reddit tests fail is that founders skip straight to interest targeting. Interest targeting on Reddit is the weakest tool in the box. Community targeting is the reason to be there at all.
Spend a week building a community map before you open Ads Manager. For each candidate subreddit, record five things: member count, rough Australian share, posts per week that mention your category, whether people discuss buying or just discuss the topic, and a fit score out of 100.
Working out Australian share is manual and worth the hour. Open the subreddit, sort by new, and read fifty posts. Count how many reference Australian retailers, Australian shipping, AUD pricing or local slang. A 60,000-member Australian subreddit will out-earn a 3 million-member global one for a brand that only ships domestically.
Two Melbourne brands make the point. Bellroy sits inside an ongoing conversation across communities like r/EDC, r/BuyItForLife and r/wallets, where people ask for durable-goods recommendations constantly. Who Gives A Crap turns up in sustainability and Australian household threads for the same reason. Neither brand had to create the conversation. It already existed, which is exactly the condition that makes paid Reddit work.
Search your own brand name on Reddit before you do anything else. What you find tells you whether you are joining a conversation or starting one, and those are two completely different budgets.
The shortlist rule
- Keep any community scoring 70 or above on fit. Below that, it is a distraction.
- Require either 60% Australian share or 40,000 raw Australian members. Anything thinner will not spend properly.
- Cap your first test at six communities. More than that and no single ad set gets enough budget to leave the learning phase.
- Park the large low-intent communities. They are brand-lift tests later, not conversion tests now.
Part 2: Write Ads That Read Like Comments, Not Banners
Reddit users have spent fifteen years developing an instant filter for marketing language. Polished brand copy that performs on Instagram gets scrolled past or, worse, gets called out in the comments under your own ad.
The comment section stays open on Reddit ads. That is the platform’s defining feature and the thing that scares founders off. Treat it as a feature. An ad with forty comments and a brand replying properly is social proof no Meta ad can buy.
The copy formula that holds up is plain, specific and slightly under-sold.
- Lead with the specific problem, not the brand. “Most gym leggings go see-through at squat depth” beats “Introducing our new performance range”.
- Name the trade-off honestly. “Heavier fabric, so they take longer to dry” earns more trust than a list of benefits.
- Use lower-case, conversational headlines. Title Case reads like an ad.
- Skip the urgency. Countdown timers and “only 3 left” language get flagged fast in comment sections.
- Show the product in a real setting. Studio-lit hero shots underperform phone-quality images consistently on this platform.
Your review pile is the best copy source you have. The exact phrases customers use when they describe the problem your product solves will outperform anything written from scratch. If you have not mined that yet, start with review mining and pull your headlines straight out of the language customers already use.
On placements, run feed and conversation together rather than feed alone. Advertisers using multi-placement see roughly 12% lower costs than feed-only setups, and conversation placements put you next to the exact thread someone is reading.
One rule that is not optional: moderate your own comments. Assign a real person to check ad comments twice a day for the first fortnight. An unanswered critical comment sitting at the top of your ad will do more damage than a bad creative.
Part 3: Fix the Tracking Before You Spend a Dollar
This is where most Reddit tests quietly break. Reddit made its Shopify integration available to all merchants worldwide on 28 May 2026, and the app handles catalogue sync and codeless pixel installation. What it does not do is send server-side events.
Browser-only tracking loses up to 40% of conversion data to ad blockers, iOS privacy settings and express checkout redirects. Reddit’s audience skews heavily toward exactly the people who run ad blockers. If you rely on the pixel alone, you will under-report Reddit revenue by a third or more, then kill a channel that was actually working.
The setup, step by step
- Install the Reddit Ads app from the Shopify App Store. Connect it to your Reddit Ads account and let it sync your product catalogue.
- Confirm the pixel is firing. In Reddit Ads Manager, open Events Manager and check that PageVisit and ViewContent are receiving data within an hour.
- Generate your Conversions API credentials. In Events Manager you need two things: the Pixel ID and a Conversions API access token. The token is non-expiring and shown only once, so save it into your password manager immediately.
- Send server-side events from the order webhook. Push Purchase, AddToCart, ViewContent and Search from your server using the access token. Purchase is the one that matters most.
- Set a deduplication key. Pass the same event ID from both the browser pixel and the server event so Reddit does not double-count. Skipping this inflates your conversion numbers and ruins the test.
- Verify the match rate. Anything above 90% is healthy. Below 80% and your event payload is missing identifiers like email hash or click ID.
If you do not have developer resource for step four, a server-side tagging tool will do it without custom code. Either way, do not start the test until Purchase is arriving from the server. A Reddit test on browser-only tracking is not a test, it is a guess.
Part 4: The Campaign Architecture for a Thirty-Day Test
Keep the structure boring. The point of the first month is a clean read, not a clever account.
Budget the test at what you can lose without flinching. For a store doing 100k a month in revenue, that is usually 3,000 to 5,000 AUD across thirty days. Anything under about 2,000 AUD will not gather enough conversions to tell you anything.
Three campaigns, five ad sets
- Campaign 1: Community conversion. Three ad sets, one per shortlisted community cluster. This carries about 55% of budget and is the real test.
- Campaign 2: Retargeting. One ad set to site visitors from the last 30 days. Roughly 20% of budget. This will almost always produce your best CPA and should not be mistaken for proof the channel works.
- Campaign 3: Dynamic product ads. One ad set running your full catalogue. About 25% of budget. Reddit’s own comparative tests put DPA at roughly double the ROAS of standard conversion campaigns, so it deserves real budget rather than a token allocation.
Run three to four creatives per ad set and leave them alone for at least seven days. Reddit’s algorithm needs conversion volume, and switching creative on day three resets the learning without giving you data.
Benchmarks to hold yourself to during the test: CPC between US$0.80 and US$1.75 on conversion campaigns, CTR at or above 0.8%, and CPA trending down week on week. Traffic campaigns should come in far cheaper, around US$0.20 to US$0.60, but traffic is not the objective here.
Part 5: Read the Numbers Like an Operator, Not an Optimiser
Reddit’s in-platform reporting will flatter itself, the same way every ad platform does. Judge the channel on what happened to the business, not what the dashboard claims.
Three reads matter, in this order.
Read one: did blended efficiency move
Pull your marketing efficiency ratio for the thirty days before the test and the thirty days during. If total revenue divided by total ad spend held steady or improved while you added a new channel, Reddit is contributing. If blended efficiency fell, Reddit is cannibalising rather than adding. This is the read that survives contact with reality, and it is the reason the marketing efficiency ratio framework beats channel-level ROAS for decisions like this.
Read two: what does a holdout say
Platform-reported conversions are a claim, not a measurement. If you have the volume for it, run a geographic holdout: exclude two comparable states from Reddit delivery and compare revenue trend against the states receiving it. Our full method for this is in the geo holdout guide. At smaller spend levels, a simpler proxy works: check the post-purchase survey field for people typing Reddit unprompted.
Read three: strip out retargeting
Retargeting will post the best CPA in the account, and it proves nothing about whether Reddit can find you new customers. Report community and DPA performance separately from retargeting. If cold community ad sets cannot get within about 30% of your target CPA by week four, the channel is not working for your product regardless of what the blended number says.
Part 6: Know When to Kill It and When to Scale It
Set the decision rules on day one, before you have any emotional investment in the result. Written down, in the campaign brief.
- Kill it if cold community CPA is still more than double your target at day thirty, with clean server-side tracking in place and at least 40 conversions recorded.
- Extend it if CPA is trending down but has not landed, or if you gathered fewer than 40 conversions. Give it another thirty days at the same budget rather than declaring a result on thin data.
- Scale it if cold CPA sits at or under target and blended efficiency held. Increase budget by no more than 30% a week and add communities one at a time.
When you scale, expand by community rather than by budget. Adding a new relevant subreddit gives the algorithm a fresh pool. Pushing more spend into an ad set that has already saturated a 60,000-member community just raises frequency and CPA together.
Watch frequency more closely than you would on Meta. Communities are small and members are regulars. Above three or four impressions per user per week you will start seeing comment-section fatigue, and on Reddit that fatigue is public.
The Compound Effect: Paid Reddit and AI Answers Feed Each Other
Here is the part that makes this more than a cheap-CPM arbitrage play.
Reddit threads are one of the most heavily cited sources in AI-generated answers. When a customer asks ChatGPT or Google’s AI Overviews for the best Australian activewear brand, the model is drawing substantially on community discussion, and Reddit is a large share of that discussion.
So a Reddit ad campaign does two jobs at once. It buys clicks at a third of the Meta price, and it puts your brand name into the exact discussion surface that AI assistants read when they answer purchase questions. The comments under your ads become indexed content. Threads where customers mention you become citations.
That second effect does not show up in your Reddit dashboard at all. It shows up months later as branded search volume and as your brand appearing in AI answers you never paid for. If you are already working on that surface, the AEO playbook covers how to get cited deliberately.
Cheap CPMs are the reason to test Reddit. Compounding presence in the answer layer is the reason to stay.
Meta buys you attention today. Reddit buys you attention today and a citation that keeps working after the campaign stops.
Your Thirty-Day Reddit Test Plan
Copy this into your project tool and work it in order. Do not skip week one.
Week 1: Research and tracking
- Search your brand and category on Reddit. Read ninety days of posts and decide whether a conversation already exists.
- Build the community map. Score each subreddit out of 100 on fit and shortlist a maximum of six.
- Install the Reddit Ads app on Shopify and sync the catalogue.
- Generate the Pixel ID and Conversions API token. Save the token immediately.
- Wire Purchase, AddToCart, ViewContent and Search as server-side events with a deduplication key.
- Confirm match rate above 90% in Events Manager before spending anything.
Week 2: Build and launch
- Write nine to twelve creatives using customer review language, lower-case headlines and no urgency claims.
- Build three campaigns: community conversion at 55% of budget, retargeting at 20%, dynamic product ads at 25%.
- Enable feed and conversation placements together.
- Set your kill, extend and scale rules in writing before launch.
- Assign one person to check ad comments twice daily.
Weeks 3 and 4: Read and decide
- Leave creatives running a minimum of seven days before judging anything.
- Report cold community performance separately from retargeting every week.
- Track blended marketing efficiency ratio against the prior thirty days.
- Check the post-purchase survey for unprompted Reddit mentions.
- At day thirty, apply your written rules. Kill, extend or scale. No renegotiating.
The whole exercise costs you a week of research and a few thousand dollars of test budget. What you get back is a definitive answer on a channel where CPMs are running at a third of Meta’s, before the rest of the Australian market works it out and bids the price up.
Because that is the real clock on this. Reddit ad revenue grew 64% year on year in the last quarter. Those CPMs are cheap because demand has not caught up with the inventory yet. That window closes.
Inside eCommerce Circle, channel testing discipline is one of the core pillars we work on with every member, because most stores are one channel deep and do not know it until costs move against them. If you want a second opinion on where your next channel should come from, let’s talk.
