Generative engine optimization · San Diego
Day spas get cited by AI twice as often as med spas — here's why that's not the win it sounds like
AI mentions day spas at double the rate it does med spas. That may sound like a win, but it all falls apart when you see who’s actually getting the shout-out.
We put both categories through the exact same paces in the same week: 10 real, independently-owned day spas in San Diego, tested against GPT-4o and Perplexity's Sonar. We used the kind of question a real customer would type in — "what are the best day spas in San Diego?" We covered the med spa results from that test in a previous post — a big fat zero out of ten were cited. The day spa results told a different story. Five out of ten got mentioned by at least one of the engines.
That’s twice the frequency. It’s also still a 50/50 gamble, and the story behind that five-out-of-ten is not the one you want to hear.
Who actually got cited
GPT-4o listed two businesses: The Catamaran Spa and La Jolla Cove Salon & Spa. Perplexity surfaced two others: Yu Spa and Spa Pendry. One more, The Spa at Fairmont Grand Del Mar, was also named by GPT-4o. Not a single one of the ten businesses was picked up by both engines at the same time — it's the same "consistency crisis" we saw with med spas, where two AI systems asked the exact same question in the same week spit out lists that have almost no overlap.
The other five — Cascade Spa, Whispering Day Spa, Spa Kingston, The Spa at Legacy, La Vie Day Spa — were named by neither model. Zero times.
Why day spa isn't the same problem as med spa
The med spa category breaks because it lives in a trust gray area — is it a spa, is it a doctor’s office — and the AI resolves that confusion by grabbing a named doctor or a big brand name. Day spas don’t have that particular issue. Nobody’s wondering if your day spa is about to perform surgery.
What day spas have instead is a citation infrastructure problem. Med spas at least have platforms like RealSelf, Healthgrades, and Zocdoc — review sites built specifically for medical-adjacent credibility. Day spas have no real equivalent. There isn't a single third-party authority whose only job is to vouch for a day spa the way those sites do for a clinic. What day spas have are Yelp, Google Reviews, and booking platforms like Vagaro, Booksy, and MindBody — general tools, not category-specific trust signals.
That gap is obvious in who got cited. Spa Pendry and The Spa at Fairmont Grand Del Mar are both hotel spas, tied to properties with their own marketing departments, press mentions, and review volume that completely overshadows a standalone business. When a model has to choose between a hotel spa with thousands of reviews across many sites and an independent day spa with a tiny fraction of that footprint, the hotel spa wins on sheer weight of third-party signal, not because it's necessarily any better.
What the two independents that made it have in common
La Jolla Cove Salon & Spa and Yu Spa are the two truly independent businesses that got cited. Both have been around for a while, both have a specific neighborhood identity built right into their name, and both appear consistently across Google Maps, Yelp, and local directories with perfectly matching business details. Neither is trying to be all things to all people — the name itself signals a specific place and a specific type of experience.
It’s a small sample size, and we’re not going to argue that two businesses prove a theory. But it matches a pattern we’ve seen in every single category we’ve tested: specificity travels further than a generic name, and consistency across listings becomes critical once a model actually has multiple sources to check against.
What we'd check first if this were our day spa
We’re not saying this is the magic bullet for the fifty percent that's invisible. But this is our starting line.
Make sure your name, address, and phone number are identical on Google Business Profile, Yelp, and your booking platform. A discrepancy — "Encinitas Day Spa" on one profile and "Day Spa Encinitas" on another — looks like two separate, less-established businesses to a model, not one consistent one.
Claim and completely fill out your booking platform listing. Vagaro, Booksy, and MindBody profiles are being pulled into local search and, more and more, into what these engines retrieve — an empty or half-baked profile isn't neutral; it's a missed citation opportunity.
Pursue local press and neighborhood coverage like you’d pursue a Yelp review. A day spa mentioned in a local "best of" list or a neighborhood blog is grabbing exactly the kind of third-party signal that hotel spas get for free and independents have to work for.
And check where you actually stand before you assume anything. You might already be one of the five that gets named. You might be starting from the same invisible half our test uncovered.
That last one takes thirty seconds. Put your business name and city into our free check, and you’ll see exactly what ChatGPT and Perplexity are saying about you right now. No signup required, nothing to install. Most day spa owners have never bothered to look — and considering half the category vanishes in this test, that’s the first thing worth fixing.