Top Tech Startups in London, United Kingdom in 2026

Alchemy is a fractional collective, not a staffing agency and not a management consultancy in the old mould. We exist because two things are true at once: senior technology and AI leadership is in more demand than ever, and fewer people want the traditional full-time employment relationship attached to delivering it. Founded by David Viney, a Fractional CIO and AI Transformation Director with 30+ years leading technology at WPP, Heathrow Airport, BSI, Arup and the BBC, Alchemy takes on established fractional-consulting incumbents directly, with a leaner, sharper model built for how this kind of work should actually operate. The hard problem we're solving is matching: clients need proven, board-ready technology leadership without the cost and rigidity of a permanent hire, and senior fractional professionals need a trusted network bringing them real engagements, rather than competing alone for scraps of visibility. We're building that bridge deliberately, one relationship at a time. Early stage, growing steadily, and already ranking prominently across major search engines and LLMs for "Fractional CIO London." Right now, the priority is forming the right connections ahead of the point where capacity becomes the real constraint.

Brain health today is invisible and inaccessible. Over 300 million people live with untreated or misdiagnosed cognitive conditions, facing long waiting lists, fragmented specialists, and high out-of-pocket costs. Unlike physical health, there is no routine panel for the brain. Connectome solves this by making brain insights as accessible as a blood test — turning the brain into a routine, trackable part of whole-body health, and building the world’s largest longitudinal brain dataset in the process. At its core Connectome is a fast, non-invasive brain scan that produces a standardized panel of metrics. These power our predictive ML engine, and lifestyle alignment score that integrates wearables and behaviour data. Together, they make brain health measurable, optimisable, and scalable through clinics, wellness centers, and digital health partners.

What we believe.. We believe life is about socialising & smiling more. Face to face. Every day. Every week. Facebook feeds don’t count. We believe humans should be more active. Not because we’re told to but because we enjoy how it makes us feel. We believe sharing team experiences gives us all a stronger sense of belonging & purpose, in a world with less and less. We believe we’re all just over-evolved apes with mobile phones stuck to our noses. We believe salvation can be found in social sports & team events. So that’s what we spend our days delivering.

We advise regulated firms on the obligations attaching to the artificial intelligence systems they build, buy and deploy. We identify which of those systems will fail regulatory scrutiny, and what must change before they are examined. Our work spans the EU Artificial Intelligence Act, UK GDPR, FCA Consumer Duty, the Senior Managers and Certification Regime, PRA model risk expectations, the Money Laundering Regulations, and the Equality Act. Most firms are subject to several of these at once. Few have assessed their systems against all of them. Engagements are fixed in scope and fixed in fee. Findings are cited to the article, and to the enforcement record that shows how regulators have actually applied it. Others advise on artificial intelligence among many things. We advise on nothing else. Strathwill Ltd, London. Company No. 17133379. Regulatory compliance advice. Not legal advice.

Mickai builds MICKAI, a Sovereign Intelligence Operating System (SIOS): AI that regulated organisations own and run inside their own walls, offline, on hardware they control. Where mainstream AI rents you someone else's model, on someone else's cloud, under someone else's rules, we move all three inside your perimeter. We have built it. Instead of one monolithic model, a cooperative substrate of specialist brains that reach consensus before any sensitive action. Every action is written to a tamper-evident, cryptographically signed, post-quantum Open Audit Record you can verify offline for years. Sensitive actions are voice-biometric gated and reversible, keyed to hardware the operator holds. On top of it we have built the everyday tools a business runs on, email, CRM, help desk, collaboration, finance and more, as 87 studios of private, on-device AI. We launch with ten; the rest follow in sequence. The architecture is protected by 104 filed UK patent applications across 2,340 claims, owned outright. We serve defence, finance, government, healthcare and other regulated sectors that cannot send their data to the public cloud. We are a small, fast, deeply technical team, hiring the people who will help us define the category.

Splitsense is building an AI agent that does conversion optimization the way a senior CRO specialist would, end to end and continuously. The problem we're solving is one every founder and growth team knows. You have analytics, heatmaps, session recordings and dashboards, but none of them tell you what to actually do. Turning that data into insight takes hours of digging. Turning insight into an experiment takes developer time most teams don't have. So most websites never get optimized at all, and the ones that do run a handful of tests a year instead of a steady stream. That's a hard problem because good CRO isn't one skill, it's a pipeline of them: reading funnels and spotting where users drop off, forming hypotheses worth testing, writing copy that converts, building variants without breaking the site, running the statistics honestly, and knowing what to test next. We're encoding that entire pipeline into autonomous agents. Splitsense crawls your site, learns your brand and audience, analyzes real visitor behavior through its own analytics and session replay, finds the leaks, then writes, launches and measures A/B tests on its own. Multi-armed bandits shift traffic to winners while tests run, so learning turns into revenue faster. The result: the kind of continuous experimentation program that used to require a CRO consultant, a copywriter, an analyst and an engineer, now available to a solo founder for the price of a SaaS subscription. We're a small, senior, fully remote team that ships fast and uses our own product on our own funnel every day. If you want your work to compound, everything we learn makes the agent smarter for every customer.