SaaS made in the United Kingdom

UK-public accounting incumbent (FTSE 100, Newcastle, est. 1981); Sage Accounting cloud product for SMB.

UK bot-protection service (Prosopo Limited) with the category's most transparent DPA, naming seven sub-processors, four EU and three US; free tier of 10,000 requests a month.

Nottingham UK developer-API-first calendar / scheduling platform (Cronofy, founded 2013), ISO 27001 + SOC 2; Wise / GoCardless / Indeed customers.

Manchester-based UK CRM (Zestia Ltd) with a free tier, public DPA, and AWS hosting; post-Brexit jurisdiction.

Reading-based UK mid-market CRM, BGF-funded, multi-currency pricing in GBP/EUR/USD; post-Brexit jurisdiction with US sales office.

UK solo-dev MIT-licensed self-hosted wiki + documentation platform (Dan Brown, 2015); no SaaS, no vendor counterparty risk.

Cambridge-based LibreOffice Online (MPL-2.0/LGPL) by Collabora Productivity Ltd: free CODE dev edition + €3/user/mo Business; self-hostable on EU infra.

England-and-Wales-governed email-alias service (formerly AnonAddy), hosted in the Netherlands; unlimited aliases, PGP-encrypted forwarding and reply-from-alias on paid tiers, open-source and self-hostable. Its operating legal entity is not named in its own Terms or Privacy Policy.

London-based low-cost email marketing (Three Hearts Digital, 2014), generous free tier, indie-friendly, campaign sending via Bird's EU infrastructure.

UK/Gibraltar cloud storage (ID Cloud Services Ltd), opt-in Twofish client-side encryption, lifetime plans; UK/DE/US data centres, no region pinning.

Sage Group plc's HR cloud product (formerly CakeHR from Riga, acquired 2019); UK-public parent, modular SMB HR.

Israeli-founded modern HRIS for mid-market (Tel Aviv + London); 5,000+ customers, heavy US VC, mostly listed for completeness.

UK creator platform (Ko-fi Labs Limited) for tips, memberships and digital shops: 0-5% service fee, but payouts run only through PayPal, Inc. or Stripe, Inc., with no EU payment option.

London-based UK direct-debit and recurring-payments specialist (FCA-authorised); Mollie acquisition announced Dec 2025.

London-based mPOS fintech (originally Berlin), 4M+ SMBs, heavy US-VC funding (Goldman Sachs led €1.5B 2024); US$10-15B London listing in preparation.

London-based open-banking A2A real-time payments (Volt Technologies, 2019), FCA EMI, 2,500 banks across 31 territories; US-VC-led.

UK-incorporated open-source E2EE messenger (SimpleX Chat Ltd, 2021) with no user identifiers of any kind; Double Ratchet + post-quantum key exchange; self-hostable relays, twice audited by Trail of Bits.

UK-headquartered open-source Matrix protocol commercialisation; powers Bundeswehr BwMessenger + French Tchap + NATO + UN.

London-based open-source product analytics (PostHog, 2020, Y Combinator W20), US + EU Frankfurt cloud regions, MIT-licensed self-host.