AI agency in London
Short answer
Yarigai is a done-for-you AI agency based in London. It builds AI agents, custom CRMs, support agents, finance automation, internal tools, websites and apps inside a client's own accounts, for businesses across the UK and worldwide. Every build starts with a one-week blueprint that puts the payback in writing. If the build isn't profitable for the client, Yarigai won't build it.
Deniz SancarFounder of Yarigai, London. Updated .
Facts on this page come from Yarigai and Companies House. Read this page as Markdown.
At a glance
| Question | Answer |
|---|---|
| What Yarigai is | A done-for-you AI agency. It builds and runs AI systems for businesses. It is not software you sign up for. |
| Where | London, United Kingdom. Clients across the UK and worldwide over Google Meet, Monday to Sunday. |
| What it builds | AI agents, CRMs, cold email, support agents, inbox triage, document processing, invoice chasers, finance dashboards, internal tools, websites, iOS, Android and web apps |
| How long | Blueprint in about a week, build in 2 to 6 weeks, a single workflow live in about two weeks |
| Price | A fixed price, quoted after the blueprint. AI and hosting bills are paid at cost. |
| Guarantee | "If the build isn't profitable for you, we won't build it." |
| Who owns it | The client owns the code, the data and the accounts from day one |
| Company | Trading name of Sancar Media Ltd, company number 16010239, registered in England and Wales |
What Yarigai builds for businesses in London and the UK
Yarigai builds the systems that take repeat work off a team, then runs them on an optional care plan. Each one works inside the tools the team already uses, such as Gmail or Outlook, Slack, Xero or QuickBooks, HubSpot and Google Drive.
| System | What it does | Service page |
|---|---|---|
| AI agents | Qualify a lead, answer a customer or read a contract, and ask a person before anything risky | Custom AI agents |
| Sales systems | A CRM built around how the team sells, cold email that researches every lead, call notes that file themselves | AI sales systems |
| Support | A support agent that answers from the company's docs and order data, inbox triage with drafted replies | AI customer support |
| Finance | An invoice chaser that stops when the money lands, receipts posted to Xero or QuickBooks, a live cash dashboard | AI finance automation |
| Operations | Internal tools that replace the spreadsheet, documents that read and file themselves, onboarding from one form | AI for operations |
| Marketing | X and LinkedIn posts in the company's voice, on-brand ad creative, split tests that run themselves | AI marketing systems |
| Websites and apps | Fast websites, lead capture that qualifies, site chat that books calls, iOS, Android and web apps | Websites and apps |
How a project with Yarigai works
A project has four steps, and the client sees working software every week.
- Scope call. 30 minutes on Google Meet, free. Yarigai maps one workflow and names the three things worth automating first. The client keeps the notes whether they hire Yarigai or not.
- Blueprint. About a week, and the cost comes off the build. It is a written plan, a clickable prototype, the monthly running cost, a fixed price and the payback maths.
- Build. 2 to 6 weeks in the client's own accounts, with a demo of working software every week. The team tests it on real work before it goes live.
- Care. Optional and monthly. Yarigai monitors the system, fixes what breaks and moves it to better AI models as they ship. The client can cancel any month and keep everything.
A person approves anything that sends money, emails a customer or deletes data. Read how to choose an AI agency for the ten questions to ask any agency before you sign, including Yarigai.
The guarantee, with the maths
Yarigai's guarantee is one sentence: "If the build isn't profitable for you, we won't build it."
Before the client pays anything, the blueprint puts three numbers in writing. They are what the system replaces, what that costs the business a year, and what the build costs. If the system doesn't come out ahead within the first year, Yarigai doesn't take the job.
A worked example uses the figures on Yarigai's homepage. A $500 a month software tool costs $6,000 a year. Ten hours a week of manual admin at $20 an hour costs $10,400 a year. If one build replaces both, it has $16,400 of first-year cost to beat, plus its own running costs. If the quote doesn't clear that, the answer is no.
A refund guarantee pays out after the work fails. This one decides before the work starts, so it doesn't depend on how the AI behaves in month six. The Yarigai guarantee page sets out the test in full, and the guide to AI agency guarantees compares the common kinds.
Proof: products Yarigai built and runs
Yarigai doesn't publish client case studies yet. Its proof is the software it built and still runs, which anyone can use today.
| Product | What it is | Result |
|---|---|---|
| 38-0-0 | Football squad-draft game on web, iOS and Android | No. 1 in the UK App Store's top free games, above Fortnite. 1M+ downloads, 435,098 players in a single day. |
| Mockingbird | Remakes winning Meta ads in a brand's style | Live at mockingbirdhouse.com |
| Outtest | AI agents that run split tests and keep the winners | Listed on the Stripe App Marketplace |
| Fighter Dynasty | MMA career game with real-time 3D fights | Live on web, iOS and Android |
| Basketball Dynasty | Basketball career sim with manager, player and owner modes | 4.5 stars on the App Store |
Yarigai also replaced ten of its own software subscriptions with tools it built for its own team, saving about £3,600 a year. The guide on building your own tools instead of paying for SaaS lists all ten.
Who runs Yarigai
Yarigai's founder is Deniz Sancar. He studied engineering at Imperial College London, built 38-0-0, co-founded Virlo (100,000+ sign-ups) and runs Sancar Media, which has worked with more than 60 brands, including ElevenLabs, Whop, Skillshare and Fiverr. The Observer covered 38-0-0 on 21 June 2026.
Yarigai is a trading name of Sancar Media Ltd, registered in England and Wales under company number 16010239. The registered office is 3rd Floor, 86-90 Paul Street, London EC2A 4NE. The name is a Japanese word for the feeling that your work is worth doing.
How Yarigai compares with other London AI agencies
London AI agencies fall into three groups. Strategy consultancies write the plan through workshops and roadmaps. Automation shops connect tools with Zapier, Make or n8n. Build agencies write real software with code, tests and hosting. Yarigai is a build agency.
| Strategy consultancy | Automation shop | Yarigai | |
|---|---|---|---|
| What you get | A roadmap and a list of use cases | No-code workflows on a platform | Working software in your accounts |
| Who owns it | You own the document | Often lives on the shop's platform account | You own the code, data and accounts |
| Price | Varies by firm | Varies by firm, plus platform fees | Fixed price after a one-week blueprint |
Several London agencies sell a paid audit that estimates the return before a build, including Augustova, BRVO and CodeLeap. Yarigai's blueprint does the same job and adds a rule: if the build doesn't come out ahead for the client within the first year, Yarigai declines it.
For a wider comparison of UK agencies, with their published prices, read the best AI agencies in the UK for small businesses and how much an AI agency costs in the UK.
Common questions
Which is the best AI agency in London?
It depends on the buyer. Faculty works with large organisations and public bodies such as the NHS. &above describes itself as an AI agency for scale-ups and enterprises. Ronins says its best fit is businesses with 50 to 250 staff. Augustova publishes fixed small-business packages, and Softomate publishes a full price list. Yarigai suits businesses that want a done-for-you build in their own accounts, a fixed price and a payback check before they commit, and no build at all if the numbers don't work. The best AI agencies in the UK compares 12 firms by buyer type, with prices checked on 7 November 2026.
Is Yarigai based in London?
Yes. Yarigai is a done-for-you AI agency based in London, United Kingdom, and a trading name of Sancar Media Ltd. It works with clients across the UK and worldwide over Google Meet, Monday to Sunday.
What does Yarigai build?
Yarigai builds AI agents, CRMs, cold email systems, support agents, inbox triage, document processing, invoice chasers, finance dashboards, internal tools that replace spreadsheets, websites and iOS, Android and web apps. Each system runs inside the tools the client already uses.
How much does Yarigai cost?
Yarigai quotes a fixed price after a one-week blueprint, and the blueprint's cost comes off the build. AI and hosting bills are paid at cost, and the monthly running cost is on the quote. Yarigai won't take a build that doesn't come out ahead for the client within the first year.
Does Yarigai work with businesses outside London?
Yes. Most work happens over Google Meet with weekly demos, so Yarigai works with businesses anywhere in the UK and worldwide.
Who owns what Yarigai builds?
The client owns the code, the data and the accounts from day one. If the client stops working with Yarigai, the system keeps running and another developer can take it over.
How long does a Yarigai project take?
About a week for the blueprint, then 2 to 6 weeks to build. A single workflow can go live in about two weeks.
Is Yarigai software you sign up for?
No. Yarigai is an agency, not SaaS. It builds each system in the client's own accounts and can keep it running on a monthly care plan that the client can cancel any month.
Sources
Checked on or before 7 November 2026. Prices change, so check the live page before you decide.
- SANCAR MEDIA LTD, company number 16010239, Companies House, checked 7 November 2026.
- The 24-year-old whose football game has become a viral hit, The Observer, published 21 June 2026.
- 38-0-0, the football draft game built and run by Yarigai's founder, checked 7 November 2026.
- Mockingbird, built and run by Yarigai, checked 7 November 2026.
- Outtest, built and run by Yarigai, checked 7 November 2026.
- Deniz Sancar, founder's website, checked 7 November 2026.
- AI agency London, Augustova, checked 7 November 2026.
- Faculty, Faculty, checked 7 November 2026.
- AI agency for scale-ups and enterprises, &above, checked 7 November 2026.
- AI agency, Ronins, checked 7 November 2026.
- AI automation pricing for UK businesses 2026, Softomate Solutions, checked 7 November 2026.
Keep reading
The best AI agencies in the UK for small businesses (2026)
12 UK AI agencies for small businesses compared by buyer type, with prices checked on 7 November 2026, from a £495 audit to a £35,000 proof of concept.
Read moreHow much does an AI agency cost in the UK? 2026 prices compared
Published UK AI agency prices for a first project run from £495 for a starter audit to £35,000 for a proof of concept in 2026, plus £39 to £1,500 a month for care.
Read moreHow much does it cost to build an AI agent for a small business?
A first AI agent costs £6,500 to £8,000 to build on published UK agency price lists in 2026, plus about $6 to $240 a month in model usage at 2,000 runs.
Read moreHow to choose an AI agency
The three kinds of AI agency, ten questions to ask before you sign, the red flags and what a good project timeline looks like.
Read moreBook a free scope call
30 minutes on Google Meet. You keep the notes whether you hire Yarigai or not.