ONE/SIZE is a TikTok-native beauty brand built on the idea that great makeup works for every skin tone. Heading into Q4 2025, they partnered with Acceler8 Labs to execute two bold platform moves — a full Meta restructure and aggressive early scaling of TikTok GMV Max — with Fospha’s measurement in the loop to validate every reallocation in real time.
Industry: Personal Care & Beauty | Services: Meta Ads, TikTok Advertising, Paid Media Management | Market: United States | Campaign Duration: Q4 2025
The Challenge
Q4 compresses decision-making, inflates CPMs, and punishes brands whose campaign structure isn’t matched to how platform algorithms allocate signal. Two specific problems needed solving before peak.
On Meta, the account had drifted into the classic fragmented setup: too many small, segmented campaigns, high-spend creatives buried inside low-ROAS structures, and no consistent Hero SKU messaging.
On TikTok, the problem was conviction. GMV Max had just launched, on-platform ROAS looked modest, and most brands were treating it cautiously. Scaling it aggressively into peak was the right call, but without cross-channel measurement to prove the halo, it was hard to defend internally.
What We Did
On Meta, we rebuilt the account around what Andromeda actually rewards. That meant consolidating dozens of segmented campaigns into fewer, larger ones with diversified creative inside each, and re-anchoring spend and messaging to top-performing Hero SKUs.
The mechanics here matter. Andromeda’s optimization surface gets sharper as more signal flows through fewer decision points. Small, segmented campaigns starve the algorithm of the data it needs to find your best pockets of demand. Consolidation looks counterintuitive if you’re used to tight audience control, but it lets the platform do what it’s actually good at. Fospha’s incrementality view then fed back which creatives were truly driving lift versus burning budget, so we reallocated inside the quarter instead of learning after the fact.
On TikTok, we scaled GMV Max from a negligible test line in Q4 2024 to 42% of total media budget in Q4 2025 — ONE/SIZE’s single largest channel by peak.
Three things made that defensible. First, creative diversity: a wide asset variety to prevent algorithm fatigue at peak. Second, affiliate integration: affiliate content became GMV Max fuel, an approach most of the market still hasn’t caught onto. Third, ring-fenced Hero SKU budget so the algorithm had a clean optimization target instead of chasing a shifting product mix. Fospha’s full-funnel attribution then surfaced GMV Max’s halo into Direct, Organic Social, and Paid Search, proving the true return was well above what on-platform ROAS alone suggested.
The Results
- +35% blended revenue YoY — on 53% higher spend, a deliberate investment in new customer acquisition
- +164% Meta ROAS YoY — with CAC down 65% and revenue up 329% on 62% more spend
- +421% TikTok combined ROAS YoY — revenue grew 525% on just 22% more spend as GMV Max scaled to primary channel status
- +145% new customer ROAS on Meta — efficient acquisition inside peak, not just efficient conversion of existing demand
- CPMs -23%, CTR +53%, AOV +6%, conversions +27% — underlying media efficiency improved across every direction
The Takeaway
Platform fluency and measurement compound each other. Moving early on new mechanics like GMV Max or Andromeda-aligned consolidation creates the biggest window of arbitrage, but only if you can prove it’s working fast enough to keep pressing. The brands that win Q4 aren’t the ones with the most historical data. They’re the ones who can act on new signal before the rest of the market has decided it’s real.
“We’ve always believed in moving early on new platform mechanics, but moving early only works if you trust the data behind the decision. Fospha gave us the measurement confidence to scale GMV Max when most brands were still waiting, and to restructure Meta in a way that felt counterintuitive but turned out to be exactly right. Q4 proved both bets.”
Niket Shah, Co-founder, Acceler8 Labs