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Top Developer APIs Companies and Startups in the UK

This article showcases some of the most popular players in the Developer APIs space. Our analysts selected these companies for a variety of reasons. This list may include both state and private ventures providing the most value within the Developer APIs industry.

Data sourced from Crunchbase and SEMRush.

Top Developer APIs Companies


Zamzar

Zamzar provides online file conversion services for individuals and businesses.

Monthly Visits6836348
Page Views / Visit2.68
Monthly Visits Growth0.0369%
Average Visits (6 months)7063226.5

Pusher

Pusher Ltd. provides a hosted API service for adding real-time bi-directional.

Find out more about their financials on Crunchbase.

Website | Twitter | Facebook | Linkedin

Monthly Visits272017
Page Views / Visit2.1
Monthly Visits Growth0.0505%
Average Visits (6 months)398913.5

FONDY

International smart payment platform. Online acquiring with global benefits.

Monthly Visits218190
Page Views / Visit1.91
Monthly Visits Growth-0.3229%
Average Visits (6 months)259434

Moosend

Email marketing service provider

Monthly Visits194803
Page Views / Visit2.26
Monthly Visits Growth-0.0323%
Average Visits (6 months)254118

Matrix

Open Source, Interoperable IP Comms

Monthly Visits143375
Page Views / Visit1.6
Monthly Visits Growth0.0125%
Average Visits (6 months)148469.5

Careerjet

Careerjet is a semantic analysis technology-based vertical search engine connecting various job vacancy listings globally.

Monthly Visits129628
Page Views / Visit2.57
Monthly Visits Growth0.1994%
Average Visits (6 months)86213.83

TouchNote

TouchNote helps you send thoughtful cards and prints to loved ones, right from your mobile, tablet or desktop.

Monthly Visits113055
Page Views / Visit2.4
Monthly Visits Growth0.5308%
Average Visits (6 months)140276

TrueLayer

TrueLayer provides a platform to build financial apps that connect to bank data, verify accounts, and access transactions in real-time.

Monthly Visits79354
Page Views / Visit3.27
Monthly Visits Growth-0.2047%
Average Visits (6 months)89902.67

42Crunch

42Crunch is the only enterprise grade, fully fledged end-to-end api security platform.

Monthly Visits24467
Page Views / Visit1.87
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Cronofy

Scheduling APIs and UI elements with real-time calendar sync. Embed scheduling into your SaaS application.

Monthly Visits23443
Page Views / Visit2.65
Monthly Visits Growth-0.4504%
Average Visits (6 months)50481.67

Copernica

Solution that helps you create your own advanced marketing campaigns

Monthly Visits22473
Page Views / Visit1.32
Monthly Visits Growth-0.0024%
Average Visits (6 months)28022.67

Pwinty

Pwinty is an API for printing photos and posters. Pwinty allows you to offer photo or poster printing from within your website or app.

Monthly Visits20996
Page Views / Visit3.81
Monthly Visits Growth0.1817%
Average Visits (6 months)18777.67

MockLab

Super-fast hosted API mocking (Service Virtualization), with a QA-friendly UI

Monthly Visits17276
Page Views / Visit2.4
Monthly Visits Growth2.7753%
Average Visits (6 months)6392.5

Impala

Impala allows products to connect to hotel systems using a well-documented JSON API.

Monthly Visits13138
Page Views / Visit2.06
Monthly Visits Growth1.1701%
Average Visits (6 months)10966.5

Metomic

The power of data without the risk. Metomic detects & protects sensitive data across all your internal databases & cloud applications.

Monthly Visits12110
Page Views / Visit1.02
Monthly Visits Growth-0.6906%
Average Visits (6 months)22341.83

Zzish

Zzish is helping app developers create, distribute and monetize education applications that have a real impact on student learning.

Monthly Visits11982
Page Views / Visit2.88
Monthly Visits Growth-0.6629%
Average Visits (6 months)14546.83

Tyk

Tyk is an open source API gateway and management platform that provides on-premises, cloud/multi-cloud, and enterprise.

Monthly Visits11337
Page Views / Visit1.11
Monthly Visits Growth-0.5794%
Average Visits (6 months)21149.17

Magora Systems

Magora Systems is a team of result-driven people, who love what they do. We like to wow people with our fresh and inspiring products.

Monthly Visits10484
Page Views / Visit1.06
Monthly Visits Growth-0.5085%
Average Visits (6 months)15048.67

Photon Interactive

Photon is a provider of omni-channel and digital experiences.

Monthly Visits8742
Page Views / Visit1.42
Monthly Visits Growth-0.3126%
Average Visits (6 months)10846.5

Civo

Cloud hosting specialists running the the world’s first Kubernetes service powered by Rancher Lab’s K3s.

Monthly Visits5820
Page Views / Visit4.33
Monthly Visits Growth-0.2508%
Average Visits (6 months)23800.5

Finage

Finage is a stock, currency and cryptocurrency real-time & historical data provider company.

Monthly Visits5736
Page Views / Visit2
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Cyclr

SaaS integration platform for SaaS companies. Deliver powerful integrations and workflows direct to users from within your SaaS application.

Monthly Visits5732
Page Views / Visit1
Monthly Visits Growth2.8188%
Average Visits (6 months)Unknown

Duffel

Duffel provides an online platform that allows users to search, book, and manage flights from multiple airlines.

Monthly Visits5180
Page Views / Visit1.14
Monthly Visits Growth6.5953%
Average Visits (6 months)3901.17

Infosit

Infosit is a Digital Agency that transforms ideas into Digital Assets.

Monthly Visits4628
Page Views / Visit5.5
Monthly Visits Growth-0.1765%
Average Visits (6 months)Unknown

SerpWow

Google Search Results API

Monthly Visits4079
Page Views / Visit2.17
Monthly Visits Growth0.1036%
Average Visits (6 months)4047

ClickAlgo

We are a Financial Technology UK-based company providing a high-quality programming service specialising with the cTrader trading platform.

Monthly Visits3936
Page Views / Visit3.33
Monthly Visits Growth-0.6199%
Average Visits (6 months)13112.83

Therapy-Box

Therapy-Box are developers specialising in healthcare and education.

Monthly Visits3283
Page Views / Visit4.58
Monthly Visits Growth0.0102%
Average Visits (6 months)3109.5

World Text

World Text is an international delivery service and supplier of text messages.

Monthly Visits2906
Page Views / Visit1.1
Monthly Visits Growth2.7161%
Average Visits (6 months)2042.33

WealthKernel

WealthKernel is a supplier of infrastructure for companies looking to offer digital investment services.

Monthly Visits2476
Page Views / Visit1
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Railsbank

Railsbank is an open banking API and platform that gives regulated and un-regulated companies access to global banking.

Monthly Visits1635
Page Views / Visit2.91
Monthly Visits Growth-0.8247%
Average Visits (6 months)3370.17

Kite

KITE is the most advanced software platform for powering a global print-on-demand internet business.

Monthly Visits1212
Page Views / Visit1.89
Monthly Visits Growth-0.5768%
Average Visits (6 months)1666.67

cloudThing

UK Managed Software Product Outsourcing – Microsoft Gold Partner.

Monthly Visits1124
Page Views / Visit2.5
Monthly Visits Growth-0.0475%
Average Visits (6 months)2525.17

Coposition

Coposition is the secure and trusted way to manage location data

Monthly Visits1001
Page Views / Visit1
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Melrose Labs

Communication services inception, development and operation. Enabling and optimising communications. #CPaaS #SaaS #UCaaS #APIs

Monthly Visits869
Page Views / Visit2
Monthly Visits Growth2.1036%
Average Visits (6 months)Unknown

Popularowl

Popularowl helps to build public-facing APIs and API platforms to e-commerce, financial, and telecommunications companies.

Monthly Visits869
Page Views / Visit1
Monthly Visits Growth3.9657%
Average Visits (6 months)Unknown

Pole Star Space Applications

Pole Star is a SaaS software solutions and APIs development company.

Monthly Visits795
Page Views / Visit7.57
Monthly Visits Growth-0.4943%
Average Visits (6 months)3796

ARWAY

Global location intelligence platform using AR/AI

Monthly Visits640
Page Views / Visit5
Monthly Visits Growth-0.0909%
Average Visits (6 months)795.5

fixspec

fixspec is a supported, cloud-based FIX connectivity platform.

Monthly Visits478
Page Views / Visit2
Monthly Visits Growth-0.8216%
Average Visits (6 months)Unknown

MindLink Software

MindLink provides business critical collaboration enabled through Enterprise Chat.

Monthly Visits467
Page Views / Visit1
Monthly Visits Growth-0.1002%
Average Visits (6 months)471

KashFlow Software

KashFlow Software is a simple but powerful, online accounting package developed with small business owners in mind.

Monthly Visits278
Page Views / Visit1
Monthly Visits Growth0.1488%
Average Visits (6 months)241.67

Allies Computing Ltd

Address data solutions for validation, verification and cleansing.

Monthly Visits276
Page Views / Visit1
Monthly Visits Growth-0.1481%
Average Visits (6 months)5110

Nethermind

API marketplace with blockchain payments for pay as you go for API usage, Ethereum clients, infrastructure and consulting.

Monthly Visits248
Page Views / Visit2
Monthly Visits Growth0.1022%
Average Visits (6 months)227

Photocert

Validates the authenticity of photos & videos and performs image analysis to automate processes with a focus in the insurance sector.

Monthly Visits236
Page Views / Visit1
Monthly Visits Growth0.1401%
Average Visits (6 months)Unknown

sheet2api

Use any Google Sheet or Excel Online spreadsheet to power a fully-fledged JSON API, no coding required.

Monthly Visits174
Page Views / Visit2
Monthly Visits Growth-0.7993%
Average Visits (6 months)Unknown

Woodseer Global

Woodseer Global is an advanced algorithmic system that gives huge coverage matched with high levels of accuracy.

Monthly Visits168
Page Views / Visit1
Monthly Visits Growth-0.9212%
Average Visits (6 months)1334

SQR Systems

SQR Systems is the secure communications backbone for Fintech & Regtech to protect mobile and Internet of Things (IoT) devices.

Monthly Visits150
Page Views / Visit2
Monthly Visits Growth0.5789%
Average Visits (6 months)115.33

Catchy

Catchy is a developer relations agency, specialising in developer program management and developer marketing.

Monthly Visits120
Page Views / Visit7
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

FIDEL API

Fidel is a payments API platform for developers, providing tools to build powerful, real-time products on top of payment cards.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Qredo

Secure and fast movement of digital assets.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Cyferd

Cyferd are pioneering the first SaaS multi-experience digital transformation platform.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Bud

Bud is a financial network combining APIs & data to create a new species of connected experiences.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Modularity Grid

Intelligent power management for terrestrial and aerospace use cases

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Hutoma

Hutoma is a building emotionally evolved AI interfaces for connected devices, app and web powered by Deep Learning.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Synth

Synthetic data for quicker and privacy compliant development and testing

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Fabacus

Innovative technology company creating transformational SAAS solutions for the licensing industry.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Apply Financial

Validate API ( for single realtime payment validation) and Validate Data Manager API (for bulk payment file validation )

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

ParcelBright

ParcelBright provides small e-commerce stores with package deliver services.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

TRAMONEX

Tramonex offers competitive, fast and safe online international payment services to small and medium enterprises

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Repay Solutions

Over The Top payment platform connecting businesses to the latest real-time payments innovations without changing bank.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Klappo

Klappo is a semantic platform for ingredients.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Eutechnyx

Eutechnyx is a computer and video games developer, based in Dunston, Gateshead in the United Kingdom.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

imin

Making physical activity searchable & bookable

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

CRUZEO Protocol

CRUZEO is a platform which lets users build at-scale decentralized marketplaces; with just a few clicks, no code necessary.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Hostarium

Hostarium’s unique platform provides scalable, affordable hosting solutions using the power of Google Cloud

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Imperium Media

Helping companies to maximize their potential on new and existing technologies.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Flagsmith

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. We’re 100% Open Source.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Carryr

We’re on a mission to supercharge the end-to-end delivery experience for fashion retailers and their customers.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Speakserve (trading as Babl)

A Cloud, SaaS Secure Video, Audio meeting and Events business using our own proprietary technology.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

iCyber-Security (Acquired by SOARX)

Our leading SOARX Cyber Defence Platform integrates all your tools in a single management GUI to effectively protect vs all types of attacks

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Data Catalyst

Personal Data Mobility delivered as a Service – simply, safely, and securely.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

SwiftDil

A connected platform to automate Anti-Money Laundering (AML) and Know Your Customer (KYC) Processes — API & Web Portal

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

BlockFacts

Real-Time Financial Data & Analytics for Digital Assets. Tick-level API & Customised Platform for Investors, Traders, Regulators.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

NStack

NStack is a platform which connects data sources, predictive models, and internal tools together.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

dividiti

Providing R&D services to help customers automate ML and Systems benchmarking

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Teech.io

Teech.io is a full stack edtech platform intended for developers to build educational applications for the mobile and web.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Pirean

Consumer and Workforce Identity as a Service, Pirean simplifies how customer’s deliver IAM capabilities for enterprise web and mobile apps.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

TxtSync

SaaS business is a provider of reliable low cost SMS thats easy to integrate to existing products.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Retechnica

What it is Ingenia is a text analytics API + web app that tags your content automatically.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Connect2Media

Connect2Media, a Manchester, UK-based digital entertainment publisher. The company, which publishes, develops and distributes games across

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Global Personals

Launched in 2003, Global Personals Ltd is one of the largest privately owned online dating companies worldwide.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Ukey1

Authentication & Data Protection as a Service #CyberSecurityStartup #London

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Powershift

Powershift is business-to-business agency specialized in increasing the value of businesses.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

CFH Docmail

CFH Docmail is an online platform that enables its users to send letters and documents directly from their computers or devices.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Automorph

AI for software development

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Qwerly

Qwerly aggregates social media data from various sources and makes it available via an API.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

ApiAxle

ApiAxle is a proxy software that manages network features and provides analytical data on network traffic.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Carbon Calculated

Carbon Management Software and Services

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

TappingStone

TappingStone offers user behavior prediction services for app developers.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

TLC Mobile

Bulk SMS Messaging Service

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Clothes Network

Fashion Technology Platform for Brands, Retailers and Influencers

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

baskt Labs

baskt Labs focusses on building sophisticated software that meets the latest and changing needs of the modern consumer.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Simunix

Directory services & data validation

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Pathway GDS

Pathway GDS is a B2B platform that provides connectivity solutions to the vacation rental sector.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Order Dragon

Payment Gateway aggregater to collect payments and subscription from any Payment gateways in the world.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Datahoard

Monetize your data, view & control your digital footprint. Earn money via sharing your data with vetted companies.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Kensei Media

Media platform development company

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Supportive.io

Supportive.io is an application program interface for customer feedback.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

BitArts Labs

BitArts Labs is a software development company that is focused primarily on the development of protection.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Bondable

API integration service

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

FitSyncMe

FitSyncMe is a fitness and health platform.

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

IDEASCHECKER

Fast validation service of an idea

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown

Click2Digital

Click2Digital is a cutting-edge digital marketing agency that offers innovative Search Engine Marketing (SEM) solutions to its clients.

Find out more about their financials on Crunchbase.

Website | Twitter | Facebook | Linkedin

Monthly VisitsUnknown
Page Views / VisitUnknown
Monthly Visits GrowthUnknown%
Average Visits (6 months)Unknown
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