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🏴󠁧󠁢󠁥󠁮󠁧󠁿 56 Top English Developer APIs Startups & Firms

This article showcases our top picks for the best English Developer APIs companies. These startups and companies are taking a variety of approaches to innovating the Developer APIs industry, but are all exceptional companies well worth a follow.

We tried to pick companies across the size spectrum from cutting edge startups to established brands.

We selected these startups and companies for exceptional performance in one of these categories:

  • Innovation
    • Innovative ideas
    • Innovative route to market
    • Innovative product
  • Growth
    • Exceptional growth
    • Exceptional growth strategy
  • Management
  • Societal impact

Top English Developer APIs Startups

Data sourced from Crunchbase and SemRush.

Railsbank

Railsbank

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

TrueLayer

TrueLayer

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TrueLayer is a fintech platform utilized to build financial apps that connect to bank data, verify accounts, and access transactions.

TrueLayer

Codat

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Codat is an API platform that provides real-time connectivity to the financial software used by small businesses.

TrueLayer

Duffel

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

TrueLayer

Bud

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

TrueLayer

42Crunch

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42Crunch is an API Security platform, addressing the development, testing, and deployment security requirements of API infrastructure.

TrueLayer

FIDEL API

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

TrueLayer

Amity

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Amity powers in-app social experiences, helping developers to easily add pre-built social features to any app with a few lines of code.

TrueLayer

WealthKernel

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

TrueLayer

Tyk

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

TrueLayer

Pusher

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

TrueLayer

tru.ID

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tru.ID is reinventing mobile authentication for today’s world through a modern developer platform.

TrueLayer

ARWAY

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ARWAY is a spatial mapping platform critical to building the Metaverse.

TrueLayer

Matrix

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Open Source, Interoperable IP Comms

TrueLayer

Nethermind

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

TrueLayer

TouchNote

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

TrueLayer

Metomic

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

TrueLayer

Hutoma

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

TrueLayer

Synth

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Synthetic data for quicker and privacy compliant development and testing

TrueLayer

Photocert

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

TrueLayer

Modularity Grid

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Intelligent power management for terrestrial and aerospace use cases

TrueLayer

MindLink Software

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MindLink provides business critical collaboration enabled through Enterprise Chat.

TrueLayer

ParcelBright

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

TrueLayer

Repay Solutions

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

TrueLayer

Imin

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Imin is a technology firm that makes physical activity searchable & bookable by using open data in the health and fitness sector.

TrueLayer

Apply Financial

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

TrueLayer

Impala

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Impala’s API connects room sellers and hotels, instantly. We empower you to build, innovate and sell.

TrueLayer

Kite

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

TrueLayer

Therapy-Box

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Therapy-Box are developers specialising in healthcare and education.

TrueLayer

Hostarium

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

TrueLayer

Safe & The City

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The Waze for personal safety navigation.

TrueLayer

CRUZEO Protocol

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

TrueLayer

Careerjet

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

TrueLayer

Moosend

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Email marketing service provider

TrueLayer

Klappo

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Klappo is a semantic platform for ingredients.

TrueLayer

Pole Star Space Applications

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

TrueLayer

Fondy

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International smart payment platform. Online acquiring with global benefits.

TrueLayer

Flagsmith

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

TrueLayer

ComplyCube

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ComplyCube is a cloud platform for automating Identity Verification (IDV), Anti-Money Laundering (AML) & Know Your Customer (KYC) compliance

TrueLayer

Babl Global Limited

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

TrueLayer

KashFlow Software

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

TrueLayer

Ceerus

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Security to communicate freely

TrueLayer

Magora Systems

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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.

TrueLayer

Qwerly

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

TrueLayer

Carryr

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

TrueLayer

NStack

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

TrueLayer

MockLab

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

TrueLayer

SwiftDil

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

TrueLayer

Pirean

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

TrueLayer

Data Catalyst

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

TrueLayer

Qoder

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Secure and Protect your companies customer facing APIs by using the Qoder geo-dispersed network of API gateways.

TrueLayer

Retechnica

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

TrueLayer

fixspec

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

TrueLayer

Infosit

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

TrueLayer

All Markets

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One-for-All Platform For Traders. Stocks, Crypto and FX. Data Consumable via API & Sheets Add-Ins.

TrueLayer

Woodseer Global

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

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