SaaS & devtools startups in London

London edtech founded 2016 by Euan Blair and Sophie Adelman, delivering apprenticeship-based training and AI upskilling as an alternative to university. Became the UK's first edtech unicorn (2022) and reache...

London AI-infrastructure and GPU-cloud provider that closed a $1.1bn Series B in September 2025 — reported as the largest Series B in European history — backed by Aker, Microsoft, OpenAI, NVIDIA, Dell, Nokia...

London decision-intelligence platform using entity resolution and network analytics for financial crime, fraud, KYC and risk. Raised a $175m Series F in 2025 at a $2.6bn valuation (led by Ontario Teachers' V...

Matthew O'Riordan, Paddy Byers

Founded 2016; realtime experience/pub-sub infrastructure powering live chat, notifications and data sync — serving over a billion devices monthly and powering more WebSocket connections than any other pub/su...

Jeremy King

Founded 2015; consumer-research SaaS letting brands survey 110M+ consumers across 45+ countries in minutes for market insight. Raised a $60M round and ~$147M total (NEA, Oxford Capital, Episode 1). A martech...

London social-impact tech company that started by crowdfunding training and support for homeless people and has grown into a caseworker platform (MAGIC) helping councils and charities move people into homes ...

Abakar Saidov, Sultan Saidov, Michael Paterson

Founded 2013 in a London garage by the Saidov brothers (children of immigrants) and Michael Paterson. 'Talent lifecycle management' / talent-intelligence SaaS matching people to roles by skills. Reached unic...

Sachin Dev Duggal

Founded 2016 by Indian-origin founder Sachin Dev Duggal; London-HQ'd 'AI-assisted' app-development platform. Hit a $1.5B unicorn valuation in 2023 (Microsoft, QIA backing) but collapsed into insolvency in 20...

Brad Van Leeuwen, Cristina Vila Vives

Founded 2018; SaaS spend-management platform combining virtual cards, subscription tracking and renewal control so finance teams can eliminate SaaS sprawl. Raised a $20M Series A (2022); ~$27M total. Reached...

Barnaby Hussey-Yeo

Founded 2016; generative-AI personal-finance assistant (chat-based budgeting, saving and credit) named a Forbes 'Next Billion-Dollar Startup'. A consumer-facing AI SaaS with strong data/ML core; borders fint...

James Isilay, Stjepan Buljat

Founded 2015; global B2B sales-intelligence and prospecting SaaS providing compliant contact and company data for go-to-market teams. Scaled to ~$70–83M ARR and 6,400+ customers by 2024 with $120M+ raised. A...

Charles Delingpole

Founded 2014; RegTech SaaS using AI/AML technology to screen millions of data points daily for financial-crime risk, serving 500+ enterprises. CEO is Vatsa Narasimha (Indian-origin, ex-OANDA). A pillar of Lo...

Marc Warner, Angie Ma, Andy Brookes

Founded 2014 (as ASI); applied-AI software, consulting and decision-intelligence for enterprise and government (NHS, national security). Agreed to be acquired by Accenture for £600M+ in Jan 2026 — cited as e...

London-headquartered fintech that secured a full UK banking licence and runs an API-driven banking-as-a-service platform — providing regulated accounts, payments and embedded-finance/compliance infrastructur...

Johnny Boufarhat

Founded 2019; virtual/hybrid-events platform that became Europe's fastest company to unicorn status (2020) and peaked at a $7.8B valuation in Aug 2021 after raising ~$1B and acquiring StreamYard. Sold its co...

Euan Blair, Sophie Adelman

Founded 2016 (as WhiteHat) by Euan Blair. Apprenticeship and applied-skills SaaS platform delivering tech/data/AI training as an alternative to university. Became the UK's first ed/HR-tech unicorn in 2022 ($...

Husayn Kassai, Eamon Jubbawy, Ruhul Amin

Founded 2012 by University of Oxford students; HQ'd in London. AI identity-verification / KYC platform matching a user's photo ID to their face. Acquired by Entrust for ~$650M in April 2024 — one of the larg...

Christian Owens, Harrison Rose

Founded 2012; merchant-of-record platform handling payments, sales tax/VAT compliance and billing for software and app businesses. Became a UK unicorn in 2022 (£162M raise, ~$1.4B valuation); raised a furthe...

London enterprise voice-AI company (University of Cambridge spinout, founded 2017) building lifelike AI agents that answer customer-service calls. Raised an $86m Series D in December 2025 (Georgian, Hedosoph...

Vishal Marria

Founded 2016 by London-born, Indian-descent Vishal Marria. Decision-intelligence platform using contextual data + AI/entity resolution to fight financial crime, AML and fraud for banks and government. Raised...

Martin Sweeney, Nick Lally, Leonard Austin, Mairtin O'Riada

Founded 2014; AI-native fraud-detection and payments platform for e-commerce and marketplaces, using machine learning and graph networks to block payment fraud. Raised a $20M Series C (2020); acquired by Wor...

Richard Robinson, James Clough

Founded 2019 by an ex-Clifford Chance lawyer and an ML researcher. LLM-powered legal 'copilot' for contract drafting, review and negotiation, serving UBS, GE, Pfizer, PwC and others. Raised a $26M Series B (...

Guy Podjarny, Assaf Hefetz, Danny Grander

Founded 2015 out of London and Tel Aviv; developer-first security platform that finds and fixes vulnerabilities in open-source code, containers and IaC. ~$1.32B raised, ~$7.4B valuation, frequently cited as ...

Victor Riparbelli, Steffen Tjerrild, Matthias Niessner, Lourdes Agapito

Founded 2017; enterprise AI-video platform generating studio-quality video from text with AI avatars, used for corporate training and comms. Raised $180M Series D (Jan 2025, NEA-led) then a ~$200M round in O...

Guy Podjarny

Founded 2023 by Snyk co-founder Guy Podjarny. 'AI-native', spec-centric software-development / agent-enablement platform where AI builds and maintains applications from specs. Emerged from stealth in Nov 202...

Alexandre Dalyac, Razvan Ranca, Adrien Cohen

Founded 2014 (Entrepreneur First alumnus). Computer-vision + deep-learning SaaS that appraises accident and disaster damage (vehicles, property) from photos to speed insurance claims. Became the UK's first c...

Martin Buhr

Founded 2015; open-source API management platform — gateway, analytics, dashboard and developer portal for maintaining, securing and monetising APIs. Has raised ~$41M, the highest among London API-management...