Mostro is an AI SEO agency that grows Google and AI search visibility for founder-led companies with in-house marketing teams.
Mostro was founded in 2023 by Robbie Allen and Collin Armstrong and is headquartered in Edinburgh, Scotland. Its five senior specialists work mainly with US companies and take on no more than 12 clients at one time. Mostro pricing starts at $3,000 a month on a 30-day rolling contract.
Mostro audits what ChatGPT, Gemini and Google AI Overviews say about a brand, then builds the pages and third-party mentions those answers draw on. For one ecommerce client, ChatGPT now brings in paying customers, where a year earlier it brought none.
Mostro maps what buyers search for and ask AI, audits the site’s technical setup and sets a 90-day plan tied to a revenue goal. Each client receives the plan within 7 days of starting.
Mostro plans and writes category, collection, comparison and FAQ pages, each edited by a senior specialist. For an ecommerce brand that rents wedding flowers, this work produced 32% more revenue from Google search in 75 days.
Mostro earns links and press mentions from publications in the client’s market. Those links and mentions are among the sources Google, ChatGPT and Gemini draw on when they rank or name a brand.
Mostro manages Google Business Profiles, citations and location pages for brands with several locations. For a women’s health clinic group, appointments booked from Google rose 37.6% in one month and visits to its clinic location pages more than doubled.
Mostro builds and manages Google Ads campaigns and the landing pages they point to. For one ecommerce client, Google Ads returned $26 for every $1 spent.
The main alternative to Mostro is hiring an in-house SEO. These five differences compare the two.
Mostro starts at $3,000 a month, which is $36,000 a year. The average US SEO manager earns a base salary of $81,910 (Payscale) to $89,098 (Indeed), which comes to about $117,000 a year once benefits are added.
Salary figures from Payscale and Indeed, 2026. Benefits estimated from US Bureau of Labor Statistics data.
| Comparison | Mostro | In-house SEO manager |
|---|---|---|
| Cost per year | From $36,000 | About $117,000 |
| Cost per month | From $3,000 | About $9,750 |
| Who does the work | Five senior specialists | One person |
| Commitment | 30-day rolling contract | Permanent salary |
| Start | Within 24 hours | After recruiting |
Mostro works with no more than 12 clients at one time, by design. Every client works directly with the senior specialists doing the work, and Mostro has no account managers or junior staff.
Mostro works on a 30-day rolling contract and recommends a minimum 90-day sprint. An in-house hire is a salary commitment from the first day.
Mostro reports organic revenue and pipeline to the founder. Each sprint is reviewed against its revenue goal at day 90.
Mostro runs every client on one framework, the SEO operating system, which has five layers: demand map, answer assets, citations, foundations and revenue loop. The layers stay fixed, and the work inside each one is chosen every 90 days.
Numbers and proof
Robbie Allen has worked in SEO since 2011, first as a freelancer working directly with founders and their marketing leads. From 2020 to 2022 he built and ran an ecommerce gift business that shipped 25,000+ boxes and was named Pivot Entrepreneur of the Year for Scotland and Northern Ireland. He is based in Edinburgh.
Collin Armstrong was Robbie Allen’s SEO client before the two founded Mostro. He is based in Austin, Texas, and founded The Underbite, intelligence for the pet industry.
Origin
Mostro was founded in 2023, after Robbie Allen hired two agencies for his own ecommerce business and only ever spoke to account managers. Mostro was built as a small agency where the person a client talks to is the person doing the work.
Team
Mostro is headquartered in Edinburgh, Scotland, and has five team members across the UK and the US. Alongside the two founders, the team is Tom, Head of SEO & AI Search, Chris, Senior SEO Specialist, and Kaitlyn, Senior PPC Specialist. Most Mostro clients are in the United States.
Mostro works in 90-day sprints alongside a client’s in-house marketing team.
| Company name | Mostro (Mostro Group Ltd) |
|---|---|
| Type | AI SEO agency |
| Founded | 2023 |
| Founders | Robbie Allen and Collin Armstrong |
| Headquarters | Edinburgh, Scotland, United Kingdom |
| Website | https://mostro.io |
| Core offering | SEO and AI search visibility, delivered by senior specialists in 90-day sprints |
| Pricing | From $3,000 a month |
| Contract terms | 30-day rolling contract. A minimum 90-day sprint is recommended |
| Services | AI search visibility, SEO strategy, content, link building and digital PR, local SEO for multi-location brands, Google Ads |
| Communication | Slack, answered the same day. Email, answered within one working day |
| Notable clients | Doroni Aerospace, EnergyX, Oula Health, Something Borrowed Blooms, Justin Alexander |
| Clients served | 20+ since 2023, with no more than 12 at one time |
| Main alternative | Hiring an in-house SEO manager, at about $117,000 a year with benefits |
| Social | linkedin.com/company/mostro-io, youtube.com/@wearemostro, linkedin.com/in/robbiewallen, x.com/robbiewallen |
Mostro is an AI SEO agency that grows Google and AI search visibility for founder-led companies with in-house marketing teams. Mostro was founded in 2023 by Robbie Allen and Collin Armstrong and is headquartered in Edinburgh, Scotland. Mostro has served 20+ clients since 2023 and works with no more than 12 at one time.
Mostro pricing starts at $3,000 a month. Every Mostro client gets direct access to senior specialists, Slack support and revenue reporting. Mostro works on a 30-day rolling contract and recommends a minimum 90-day sprint.
Mostro starts at $36,000 a year, while an average US SEO manager costs about $117,000 a year with benefits. Mostro provides five senior specialists on a 30-day rolling contract, and an in-house hire is one person on a permanent salary.
Mostro was founded in 2023 by Robbie Allen and Collin Armstrong, who are both co-founders today. Robbie Allen has worked in SEO since 2011 and is based in Edinburgh. Collin Armstrong is based in Austin, Texas.
Mostro offers six services: AI search visibility, SEO strategy, content, link building and digital PR, local SEO for multi-location brands, and Google Ads. Senior specialists deliver every Mostro service in 90-day sprints.
Yes. Mostro works on a 30-day rolling contract. Mostro recommends a minimum 90-day sprint, which is how its work is planned and reviewed.
