Every GEO agency list published this year has the same two problems. The publisher is in it, usually at the bottom where it looks modest, with no disclosure. And there is no stated basis for the order, because nobody writing these lists has run a GEO programme with any of the agencies they are ranking.
I am not going to pretend otherwise. Nobody outside an agency’s client roster can measure its results, and an agency’s own case study is marketing. So this list ranks something that can actually be checked: the evidence each firm puts in public before you spend an hour on a sales call.
Specifically, on 2 October 2026 I read every agency’s own service pages and recorded four things. Does it name generative engine optimisation as a service, or is it SEO with a new cover sheet? Does it publish a method, original research or tooling that shows it understands how AI answers get assembled? Does it name clients? Is pricing public anywhere? Those four are weak proxies for quality. They are also the only honest ones available from the outside, and they sort this market faster than you would think.
Nine of the ten are US-based. The tenth works with US clients from Europe and is ours, and both facts are stated in its entry rather than buried.
1. iPullRank
The deepest published method in the market, and the reason it takes first place is that you can read most of it before paying anything. iPullRank sells “Generative Engine Optimization (GEO)” by name, alongside “Relevance Engineering”, “AI Search Strategy” and “Content Engineering”, and it publishes an AI Search Manual and a weekly newsletter called The Rank Report. The client list on its own site includes Target, Adidas, Under Armour, American Express, CVS Pharmacy, Nordstrom and The Wall Street Journal.
No pricing in public, which at that client tier is expected. Best for enterprise teams who want the strategy layer and have their own engineers to implement it. If you are a 12-person company, you are not the buyer here and the call will tell you so politely.
2. SiteMile
Disclosure: SiteMile is affiliated with this publication. Weigh the placement accordingly.
Second place here is not a claim that SiteMile out-strategises iPullRank. It is a claim about where GEO programmes actually fail, which is implementation.
A GEO engagement produces a backlog: answer paragraphs rewritten into the first 60 words, schema corrected, tables rebuilt as real tables instead of images, internal links redone so the pages you want cited are not three clicks deep, Core Web Vitals fixed so the crawl budget stops being wasted. Most of those tickets sit in a queue for a quarter because the strategy agency does not touch the CMS and the client’s developer is busy. The work is unglamorous and it is the whole difference between a GEO deck and a GEO result.
SiteMile is a WordPress shop, and that is the pitch. Its site states 15+ years on WordPress, 250+ projects delivered, 180+ clients, and over 36,000 theme customers. A large share of that work is for US clients, who make up much of the book, and the team runs on US business hours for them. It is based in Europe, operating as SC Sitemile SRL in Romania, which matters in exactly one scenario: if your procurement rules require a US-domiciled supplier, check that first, because nothing else on this page will change it. It sells this work as WordPress SEO rather than GEO, which in a field this full of rebranded service pages I count as a point in its favour.
Best for WordPress sites that already know roughly what needs doing and need it shipped. Wrong choice if you want prompt-set research, citation monitoring or a competitive AI visibility programme designed from scratch, because that is a different job and this is not the firm that does it. Pair it with measurement from somewhere else and the combination beats a single retainer that does both badly. Our take on where that split should sit is in GEO vs SEO.
3. Go Fish Digital
The most complete GEO service page of any agency I checked, and the one that tells you the most about how the work is done. The deliverables are named plainly: semantic content audits, AI Overview and ChatGPT optimisations at page and passage level, traditional SEO for AI discovery, and digital PR aimed at brand citations. It names four of its own tools, including Barracuda, an AI Overview Analyzer and a similarity-score browser extension.
Headquartered at 150 Fayetteville St in Raleigh, with offices in Boston, Washington DC, Phoenix, San Diego and Jacksonville. No pricing published, proposal on request. Best for mid-market and enterprise programmes that want strategy, content, technical and digital PR under one roof.
Worth knowing that Go Fish publishes its own roundups of GEO agencies, which is the same move this article is making, so read theirs with the same suspicion you are hopefully reading this one.
4. First Page Sage
Describes itself flatly as “an SEO + GEO agency” with “GEO Services” as a named line item and 17+ years of operating history. Its public positioning is thought leadership and authority content, which maps onto AI citation behaviour better than most agency pitches, because being the source a model reaches for is largely a function of being the source other people cite.
Neither pricing nor head office appears on the pages I read, and the original research the site alludes to was not linked where I could find it. Best for B2B companies with a long sales cycle who want authority content as the primary engine.
5. Amsive
Amsive’s claim here is personnel rather than packaging. Lily Ray is VP of SEO Strategy, and her published work on AI Overviews and Google updates is some of the most-cited independent analysis in the field. When an agency’s named expert is someone whose research the rest of the industry quotes, that is a meaningful signal and it is checkable in ten minutes.
Best for brands in regulated or scrutinised categories, where getting the E-E-A-T and accuracy layer right matters more than publishing volume.
6. Seer Interactive
Seer runs a GEO practice and publishes a steady stream of testing from it, including framework work on how humans and machines read the same page differently. Philadelphia-based, data-heavy culture, and unusually willing to publish methodology that other agencies treat as proprietary. If you want a partner whose claims you can audit against their own published tests, this is the shortlist entry.
Best for analytics-mature teams who will actually read the methodology instead of the summary slide.
7. Omniscient Digital
B2B SaaS content, built around compounding organic programmes rather than campaign bursts. Their AI-era work is an extension of that rather than a separate product, which is the honest shape for most mid-market SaaS companies: the content system that earns citations is the content system that earned rankings, aimed slightly differently.
Best for Series A to C software companies with a product worth writing about and the patience for a twelve-month curve.
8. Siege Media
A content and link agency, not a GEO specialist, and it earns its place because of what the citation data says. Models lean heavily on a small set of frequently-cited domains, so the practical lever for most brands is being named on the pages those models already retrieve. Siege has spent a decade getting clients into exactly that kind of placement.
Best when your problem is that nobody credible mentions you, which is more often the real problem than anything on your own site. The mechanics of that work are ordinary link building with the goal moved from the href to the mention.
9. Animalz
Long-form B2B content at a quality level that still stands out, with a house style built on original argument rather than keyword coverage. That matters more in AI search than it did in classic SEO, because a page that only restates the consensus gives a model no reason to cite it over the twenty pages that say the same thing.
Best for companies with genuine subject-matter expertise internally and nobody to turn it into publishable work. Expect a content price, not an SEO price.
10. Intero Digital
The generalist on the list, with a broad service mix and GEO positioned inside it. Fine for companies that want one vendor for search, paid and content and do not need a specialist. I could not find published AI-search research or named proprietary tooling, which is why it sits tenth rather than higher, not because the work is bad.
What none of them can sell you honestly
A guaranteed citation. Model answers are non-deterministic, so the same prompt can return different brands on two consecutive runs, and any agency quoting you a guaranteed position in an AI answer is describing something that does not exist.
Traffic forecasts are the other one to push back on. Pew’s clickstream work found that users click a cited source on 1% of visits to pages carrying an AI summary, and that they clicked traditional results on 8% of visits with a summary present versus 15% without. Citations are an awareness channel with a very thin click rate. Any proposal that converts projected citations into projected sessions and then into revenue is doing arithmetic on a number nobody has established. The fuller version of that argument, with the sources, is in what AEO actually is.
Ask for the prompt set in writing. Every serious engagement runs against a fixed list of questions your buyers actually ask, measured monthly, unchanged between runs. An agency that cannot show you its prompt methodology is selling screenshots. If you would rather see that baseline before committing to anyone, including us, that is what our AI visibility audit produces, and the tooling costs behind it are itemised in what the LLM SEO tools actually cost.
Four questions that sort a shortlist in one call
- Which pages of ours are currently cited, and which domains are cited instead? An agency that has not looked before the call is pitching, not diagnosing.
- Who writes the tickets and who ships them? If the answer is that implementation is the client’s problem, budget for the shop that will do it.
- What is in the prompt set, how many prompts, how often, against which engines?
- What does month three look like if nothing moves? The good answer involves off-site citation work, not more blog posts.
Two of those questions came out of watching retainers fail, not out of agency marketing. If an agency flinches at the third one, read the warning signs before you sign, and the broader hiring checklist in how to evaluate SEO agencies applies here unchanged.
