Top Tech Startups in United Kingdom in 2026

Constructor.io is the only search and product discovery platform tailor-made for enterprise eCommerce where conversions matter. Constructor's cloud-based solutions use natural language processing, machine learning-enhanced results ranking, and collaborative personalization to deliver powerful user experiences across all facets of product discovery -- from search to browse, recommendations, and autosuggest. We optimize revenue before relevance. This has allowed us to generate consistent $10M+ lifts for our customers, which include some of the biggest brands in retail like Sephora, Backcountry, Tommy John, Lego and Bonobos. Constructor is a U.S.-based company that was founded in 2015 by Eli Finkelshteyn and Dan McCormick.

CreativeX, formerly known as Picasso Labs, powers creative excellence for the world’s most loved brands. By analyzing creative at scale, our technology aims to advance creative expression through the clarity of data. Used globally by Fortune 500 brands like Unilever, Mondelez, Heineken, ABI, Google, and more, CreativeX measures and improves creative efficiency, consistency, and effectiveness across all their creative content worldwide. Visit creativex.com to learn more or reach out anytime: [email protected].

We eliminate tens of thousands in upfront data expenses, while giving you the instant flexibility to pick up real-time full exchange feeds or terabytes of historical data when you need it. Whether you're a Fortune 500 bank or a single-person startup, we scale with your budget and needs to deliver the same cutting edge performance and data integrity. For more info, visit databento.com

Madison Reed (madison-reed.com) is an e-commerce start-up with a team of 180+ rock stars in San Francisco. We’re revolutionizing the $50B hair care market using technology (web, mobile, tablet, social) to radically innovate the user experience and business model. Madison Reed is headquartered in SF and backed by top-tier venture capital firms Norwest VP, True Ventures, Maveron and Shea Ventures.

Softr is the easiest way to build custom apps and portals from Airtable, in minutes. #nocode required. With Softr, you can build client portals, internal tools, marketplaces, online communities, resource directories, websites and more. Our mission is to democratize the engineering genius. Start for free - softr.io

Plum is powered by automation, and acts like an autopilot for your money. You sit at the controls, with smart spending analytics and budgeting tools to help you set your financial destination. Plum gets you there safely, so you don’t need to remember things like setting money aside, getting the best deal on household bills. Plum’s making your savings and investments work for you.. Our Mission: We’ve Imagined a world where people effortlessly manage their money without having to worry, or even think about it. A world where our users’ money has a brain that’s configured to automatically reach what is important to them. ...And here at Plum, we made it our mission to build that world... and we’re now ready to make it a reality for Plumsters. We welcome them to our reality! Where their money works for them, and their entire financial journey is easier by an autopilot, controlled by them.

Tremendous is the simplest way to send rewards and payouts around the world. We handle almost any form of payment that isn’t payroll. And our platform is free to use. We handle the tricky stuff that comes with sending money, so orgs can easily send rewards to research participants, sales prospects, employees, and so on in over 200 countries. We're 75 people, fully remote, highly profitable, and self-funded (yes, crazy, we know). Come work with us!

Postman is the leading API platform, used by 17 million developers and 500,000 organizations worldwide. Postman simplifies each step of the API lifecycle and streamlines collaboration so developers and teams can create better APIs—faster. Postman is a global company with headquarters in San Francisco, a large office in Bangalore (where the company was founded), and distributed team members on four continents. Postman is privately held, with funding from Insight Partners, CRV, Nexus Venture Partners, Coatue, Battery Ventures, and BOND. Learn more at postman.com or connect with Postman on Twitter via @getpostman.

SeedLegals is the one-stop destination for taking care of all the legals you’ll need to build, run and fund your company. There are 100,000 new growth startups in the UK every year. Each spends thousands of pounds on unique documentation. SeedLegals uses the power of the network to change that. Using mass deal data and the network effect, SeedLegals gives you the knowledge, documentation and data to build corporate, team and funding agreements that are perfect for your company. SeedLegals gives each the knowledge & data to make the best decisions for their startup funding & legals, and puts them in control.