Six agencies, scored on one test above all others: can they show you a citation they earned for a client?
Ask a dozen agencies whether they do AI SEO and all twelve will say yes. Ask them to pull up a single case where they got a client named inside ChatGPT, Perplexity, or a Google AI Overview, and the room tends to go quiet. That silence tells you more than the rest of the pitch will.
The term has outrun the work behind it. Some firms got faster at writing content with AI and rebranded the speed as a discipline. Others stapled the letters GEO onto the technical SEO they were already selling. A smaller group actually can lay the receipts on the table. Telling them apart is the whole job here.
AI-referred traffic to websites climbed more than 500% year over year in early 2025, according to Previsible. Long before a buyer opens a browser tab, many have already asked a model who to trust. If your name never comes up, you lost the deal in a conversation you never saw.
This ranking scores six agencies out of 1000, with documented citations weighted heaviest. One question sits under every criterion – who has actually shown a client a citation they earned?
| Rank | Agency | Score | Best fit |
| 1 | The 66th | 950 | Brands that want tracked citation outcomes |
| 2 | First Page Sage | 908 | B2B brands building long-term authority |
| 3 | Onely | 871 | Sites where technical gaps block citations |
| 4 | Revv Growth | 839 | Early-stage brands wanting AI visibility from day one |
| 5 | MADX Digital | 812 | SaaS teams wanting SEO and AI search in one place |
| 6 | Searchbloom | 775 | Full-service SEO with some AI search coverage |
What people actually mean by “AI SEO”
The confusion is that one phrase covers three different jobs.
- Speed: using AI to produce work faster: drafting content, clustering keywords, speeding up audits. Useful, but it says nothing about whether a model actually recommends you.
- Generative Engine Optimization (GEO): the craft of shaping your content and brand footprint so AI systems cite you when someone asks. This is what most buyers are picturing when they say “AI SEO.”
- Measurement: running the same prompts across platforms on a schedule and recording where you show up and where you stay invisible. Skip this, and every claim about AI visibility is a story with no way to check the ending.
This ranking leans almost entirely on the second and third.
How the scoring worked
The framework splits 1000 points evenly across five areas. Proven citations count for the most, and any agency that can’t name clients with real numbers hits a ceiling positioning can’t lift. The GEO method is judged on whether it’s a repeatable system or just a slide. The traditional SEO foundation carries heavy weight, because models cite pages that already rank, and citations built on thin ground evaporate. Technical plumbing counts too: schema, structured data, entity definitions, review signals. And openness is rewarded: published methods, named people, and case studies with real figures instead of a discovery-call gate.
1. The 66th (950/1000)
The 66th is a Vancouver GEO and SEO shop, and founder Liam Lytton runs every account start to finish. The order never changes: fix the SEO foundation, then build the citation layer on top. Three engagements make the case. In four months, Hedra grew organic Google revenue by 196%, revenue from ChatGPT by 1,150%, and revenue from Gemini by 180%. Tenmar, a construction brand with almost no domain authority, became the first name a model cited for cost questions in its category, and saw its leads quadruple. The agency reports citation counts across platforms every month.
2. First Page Sage (908/1000)
First Page Sage, out of San Francisco, built its name on thought-leadership content, the expert-bylined kind that gets a brand treated as a source rather than a vendor. It was among the first shops to publish a documented GEO method instead of a buzzword, and it keeps putting out public research on how AI search actually behaves. Its B2B track record runs deep, which is exactly where authority compounds. This is a twelve-month play, so it suits brands building for the long haul more than ones that need results this quarter. In one documented campaign for the logistics firm iGPS, it lifted the organic conversion rate from 0.04% to 0.22%, a 484% jump. Ask them on how they track citations platform by platform, since the strength here is content authority more than measurement.
3. Onely (871/1000)
Onely is a technical SEO team, and that is the point. A model can only cite a page it can actually read, so crawlability, rendering, and clean schema are the foundation everything else sits on. Onely has spent years on the unglamorous problems: JavaScript that won’t render, crawl budget bleeding out on junk URLs, structured data missing at scale. Those are the same issues that quietly cap a brand’s AI visibility. When what’s blocking your citations is technical rather than editorial, this is the team that finds it. Its published work includes Stratos Jet Charters, whose organic traffic rose 129% after Onely’s technical fixes. Confirm they can support the content and entity side, or pair them with someone who can.
4. Revv Growth (839/1000)
Revv Growth leads with GEO, which suits younger brands that want AI visibility from the first month. Its program leans on entity definition, review signals, and content structure that make a low-authority brand easier for a model to pick up. That is the exact wall new companies hit when established names dominate the answers. The public case data is thinner than the top three, so ask for current citation results from live accounts.
5. MADX Digital (812/1000)
MADX Digital comes at this from SaaS content, and that origin shows. Its comparison pages and product-led articles are built around clear, single claims, the format models reach for, so much of its work reads well for AI extraction almost by default. For a SaaS company that wants search and AI visibility from one team, that is a real operational win. The honest limit is depth. The AI layer sits on top of a SaaS SEO practice more than a standalone GEO discipline, so check how they measure citations before you assume it’s covered.
6. Searchbloom (775/1000)
Searchbloom is a full-service shop with a strong Clutch record and AI search work. The review track record is the standout: consistent, verified, and heavy on comments about communication and follow-through, which counts for more than most buyers admit. It fits the company whose main need is well-run SEO across the board, with AI search as a welcome layer on top. AI search here is a service line inside a broader offer, request the exact GEO deliverables and how they will be measured.
How to test any of them before you sign
The list is a starting point, while the real filter is a few questions on a single call.
- Ask them to show one citation they earned for a client, along with the prompt that produced it. A real practitioner has the screenshot ready.
- Ask how they track performance: which prompts, which platforms, how often.
- Ask what foundation they’d build first. Anyone who jumps straight to citation architecture without addressing your technical health is selling you a roof with no walls.
- Ask which platforms they optimize for, since ChatGPT, Perplexity, and Gemini each pull content differently.
Then run the simplest test yourself: search their own category in ChatGPT and see whether they show up. A firm that can’t earn its own citations is a strange choice to build yours.
To sum up
The best AI SEO agency is the one that can show you a citation before you hand over a dollar.
That is a higher bar than most of the market clears right now, because the label spread faster than the skill. The names that hold up treat citations as a number they report every month, build the search foundation before the AI layer, and can explain the whole thing in plain language. Everything else is positioning.
Pick the one whose proof lines up with your category, your stage, and your timeline.
