Reddit's split testing rollout hands all advertisers controlled A/B tests at user level

Reddit has made its split testing feature generally available to all advertisers, bringing controlled A/B testing capabilities directly into Ads Manager for the first time. The rollout follows testing with selected ad partners over recent months.

The tool splits audiences at the user level, runs two flights with a single variable changed, and delivers a winner declaration at 65% confidence. Tests can run between two and six weeks, depending on sample size requirements.

For performance marketers, this is the clearest signal yet that Reddit is building for conversion-focused advertisers, not just brand awareness budgets.

What's different about this

The tool is available globally for advertisers using supported campaign objectives, including Awareness/Reach, Traffic, Conversions, Shopping, App Installs and Video Views. There's a catch: advertisers must spend a minimum of $1,000 per day to access the feature, which narrows the audience to mid-market brands and above.

The feature includes pre-built templates for commonly used experiments, removing the need for marketers to design test structures from scratch. Setting up a test takes a few minutes through the Experiments dashboard in Ads Manager, though some templates, including Reddit Max, Custom and Creative tests, require advertisers to create the treatment variant manually.

The platform splits the audience at the user level to avoid overlap and declares a winning variant once it reaches 65% statistical confidence. That matters because it sidesteps the "divergent delivery" problem that has plagued A/B tests on algorithmically optimised platforms, where delivery systems can skew results by targeting different ad variants to different audience segments.

According to Reddit, beta data showed that four out of five split tests successfully identified a winning variant on return on ad spend. When no clear winner emerged, advertisers were able to determine that both strategies performed similarly, which is itself a useful data point when deciding where not to spend optimisation time.

Why this update matters now

This isn't just a feature launch. It's infrastructure that changes what kind of advertiser can succeed on Reddit.

The platform has been posting exceptional growth in its ad business. Ad revenue rose 74% year over year to $625 million in Q1 2026, and performance advertising represented more than 60% of total ad revenue, up sharply from previous quarters. The advertiser base grew 75% year over year during the quarter.

That growth has been driven partly by Reddit's push into lower-funnel tools. The split testing rollout sits alongside other performance-focused updates launched earlier in 2026, including Max campaigns for app promotions, which automate targeting, creative selection, placements, and budget allocation, and App Event Optimization, which is now generally available and has driven an average 22% improvement in cost per acquisition.

Split testing closes a measurement gap that has historically made Reddit harder to justify for performance teams. Previously, advertisers tested via sequential flighting (running one variant, then another) or duplicated campaigns with custom audiences, both of which introduced bias and made clean attribution difficult. Now they can run true controlled experiments without leaving the platform.

Where Reddit still lags

The $1,000 daily spend threshold is a sharp filter. It excludes smaller brands and performance marketers running lean test budgets on newer platforms. Meta and TikTok both offer split testing tools without minimum spend gates at this level, making them more accessible for early-stage testing.

TikTok's split testing is designed to deliver results with a 90% confidence rate, higher than Reddit's 65% threshold. That difference in statistical rigour may matter to performance teams used to tighter confidence intervals, though Reddit's lower bar means faster winner declarations in practice.

The feature also arrives later than similar tools on rival platforms. Meta and TikTok have offered native A/B testing for years. Reddit is catching up, not leading, and the performance marketing playbook has already been written elsewhere.

What this means for social media marketers

If you've dismissed Reddit as a brand awareness channel or assumed it couldn't deliver measurable performance, this changes the calculation. The combination of split testing, rising performance ad share, and proven ROAS data from beta tests makes Reddit a viable test for mid-market and enterprise performance budgets in 2026.

The platform's contextual targeting model, which doesn't rely on personal data in the way Meta's does, also gives it an edge in privacy-conscious markets. Subreddit-based targeting lets brands reach high-intent audiences in environments where users actively seek recommendations, a rare advantage in the current social landscape.

For performance teams, the strategic question is whether Reddit's audience and intent model justifies the $1,000-per-day entry point for testing. If your category has active discussion on Reddit and you're already spending mid-five-figures monthly on Meta or TikTok, this is now a cleaner path to validating Reddit as a channel.

If you're running leaner budgets or testing new markets, the spend floor remains a barrier. But the direction of travel is clear: Reddit is building to compete directly with Meta and TikTok on performance marketing infrastructure, not just community-driven reach.