Best API Management Software in the UK - Page 2
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Compare the Top API Management Software in the UK as of October 2026 - Page 2
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1
The OptimalCloud
Optimal IdM
The OptimalCloud platform is a full featured, award winning, SSO Federation & IAM solution that provides a single point of authentication, policy management and auditing for a seamless end user experience. The OptimalCloud is deployed in workforce and consumer scenarios, used by some of the most recognizable companies on the globe, and used in some of the most secure environments in the world. Each feature-rich pricing tier comes with multi-factor authentication (MFA), because proper security shouldn't cost extra. The OptimalCloud is integrated with more than eleven thousand applications, simplifying set up and configuration and also has 24 x 7 x 365 support with a guaranteed uptime of 99.99%.Starting Price: $2/user/month -
2
Advantage CSP
Advantage CSP
Advantage CSP is an enterprise-class content services platform that powers complex websites, mobile apps, and business applications while offering the flexibility to adapt to each organization's unique processes and workflows. From public-facing websites to business applications that drive organizational processes, Advantage CSP unifies an enterprise for efficiency. Centrally manage thousands of sites using just one interface. 30% faster development and deployment time compared to a traditional CMS. Spend less time on coding and more time on scaling your business. The multi-tenant architecture enables multi-site and multi-language deployments from a single dashboard. Effortlessly help your team efficiently create beautiful digital experiences for every user on any device. Achieve true flexibility and power.Starting Price: $79 per month -
3
Impala
Command Line Software
Connect your product to hotel data in minutes Securely read from and write to many hotel systems using one powerful, well-documented JSON API. Connect your app to our Test Hotel in minutes, and connect to real hotels in days, not weeks. One easy-to-understand, universal REST API to connect to many hotel systems. Impala uses bank-grade security, is fully GDPR-compliant and uses geographically diverse hosting. Impala will be the last PMS integration you’ll ever need. We’re connecting your app to hotel data by integrating with a growing number of property management systems, so you don't have to. We're continuously adding hotel systems, so you can sell to a wider range of hotels every month. Modern hotel technology needs complete data and that's what Impala provides, seamlessly and in both directions. Whether you need to read guest information, write a new transaction or receive an update on a rate change, the Impala API provides a full range of data.Starting Price: €17 per month -
4
Gravitee
Gravitee.io
Gravitee is an AI agent management and API management platform designed to secure, observe, and govern interactions between AI agents, models, APIs, event streams, and enterprise services. Its AI Gateway provides centralized control for LLM traffic, MCP tool access, and agent-to-agent communication through LLM Proxy, MCP Proxy, and A2A Proxy capabilities. The platform can enforce authentication, authorization, least-privilege access, PII redaction, rate limits, spending controls, and audit logging across AI traffic. Gravitee also provides visibility into agent behavior, token consumption, dependencies, costs, and usage patterns so organizations can identify shadow AI and unmonitored workloads. Beyond AI governance, the platform manages APIs and event streams, including REST, GraphQL, gRPC, Kafka, and related enterprise integration patterns. Gravitee is designed for organizations that want a unified control layer for AI agents, APIs, events, and model access.Starting Price: $2500 per month -
5
Martini
TORO Cloud
Join the growing community of integration ninjas using Martini™ to integrate faster. Gloop eliminates the grunt work required when creating services for application and data integration, building APIs, and managing data. Gloop makes it easy to perform common development tasks such as mapping and transforming data, iterating over arrays, executing if-else and switch-case logic, invoking external code, running jobs in parallel, and so much more. Flux is Martini’s event based workflow engine for managing asynchronous workflows and event based triggers of Gloop microservices. With Flux you can invoke Gloop microservices sequentially, passing the output of one to the other, and/or in parallel, and Flux will maintain the state of each execution for you. Flux workflows are created visually by dragging Flux states onto a canvas and selecting the Gloop microservice you would like executed when the state is invoked.Starting Price: $500 per month -
6
SyncTree
Ntuple
SyncTree strives to be a "Super Connecting Platform" that can easily connect any services you want. With SyncTree, which consists of SyncTree STUDIO, a solution for building backend business logic with block coding, and Block Store, a platform for buying and selling pre-made backend function blocks like App Store, you can organically utilize data and connect services to achieve unlimited service expansion. Based on aPaaS, Block Store provides APIs from various services such as ChatGPT, DALLE, YouTube, etc. in the form of 'backend function blocks', which you can subscribe to and then combine as you want quickly in SyncTree STUDIO to build your business logic. SyncTree is for everyone, whether you're an individual or a business, and you can subscribe and use it according to your needs, from the free version to the PRO version.Starting Price: Free/1Month/3,000 Call -
7
Pangea
Pangea
Pangea is the first Security Platform as a Service (SPaaS) delivering comprehensive security functionality which app developers can leverage with a simple call to Pangea’s APIs. The platform offers foundational security services such as Authentication, Authorization, Audit Logging, Secrets Management, Entitlement and Licensing. Other security functions include PII Redaction, Embargo, as well as File, IP, URL and Domain intelligence. Just as you would use AWS for compute, Twilio for communications, or Stripe for payments - Pangea provides security functions directly into your apps. Pangea unifies security for developers, delivering a single platform where API-first security services are streamlined and easy for any developer to deliver secure user experiences.Starting Price: $0 -
8
Treblle
Treblle
Treblle is a federated API Intelligence platform built for enterprises that need full visibility, control, and security over their APIs. With a single integration, Treblle provides real-time API Discovery, Observability, Analytics, Governance, Runtime Security, and Developer Portals. It supports on-prem and private cloud deployments to meet strict compliance and data privacy requirements. Treblle helps teams shift left by surfacing API issues early in development and ensuring consistency across environments. Its AI-powered Integration Assistant simplifies onboarding and reduces manual effort. Trusted by global enterprises and recognized over 15 times by Gartner, Treblle accelerates innovation while giving you complete control over your API landscape.Starting Price: $25 per month -
9
holidays.rest
holidays.rest
holidays.rest provides the most accurate and comprehensive holiday data delivered at blazing speed for customers at any scale. Cover national, public, and religious holidays for 190+ countries in milliseconds with our RESTful API. We take pride in delivering authentic, accurate data. Our API exclusively offers real historical information without artificial records. For example, it recognizes that October 3rd wasn’t German Unity Day in 1985 because Germany wasn’t unified at the time—something many other APIs fail to account for. We also don’t provide fictional data. The United Nations recognizes 195 countries, with an additional 9 partially recognized states. Unlike others, we don’t exaggerate by claiming to cover 250 countries. Our pricing is straightforward: all plans give you full access to the capabilities of our API, without restrictions on parameters or features. No hidden limitations—just simplicity.Starting Price: $39/month -
10
CodeRifts
CodeRifts
CodeRifts is signed, offline-verifiable authorization for API-contract changes. Before a change to an OpenAPI, GraphQL, protobuf, AsyncAPI or MCP tool contract merges, deploys or publishes, CodeRifts decides whether it is authorized and signs the decision into a receipt that anyone can verify without CodeRifts — MIT verifiers in JavaScript and Python, no API key, no database to trust. A GitHub required check makes the decision enforcing: without a valid receipt for the pull request's actual diff, the merge is blocked. MCP tools, an SDK and a CLI let AI agents ask before they change a contract; the agent branches on one field, execution_action. Breaking-change detection, risk scoring and policy checks are the analysis underneath, free for public repositories. Every decision states what it does not prove. Only a granted change can proceed. Supports GitHub App and Actions, GitLab CI (API derivation), CLI, REST API and the MCP protocol.Starting Price: Free -
11
Zunoy MockAPI
Mentcube Innovations Pvt Ltd
Zunoy MockAPI - a game changer for developers looking to create and use mock APIs without needing to set up a full backend service. It's ideal for those times when you just can't wait for the actual API to be ready, whether it's a matter of frontend dev, testing, or prototyping. Quick to get up and running, users can whip up mock endpoints in no time, define the request & response data, and make the whole thing behave just like a real API - totally on point for development & testing purposes. This platform really does make life easier for teams to keep on working independently, regardless of whether the backend is ready or not - no dependencies to hold things up. You can test integrations, validate app workflows & show off product concepts, all with realistic API responses. The truth is, MockAPI is a real lifesaver for building prototypes, testing apps, speeding up dev cycles & reducing delays caused by a half-built backend.Starting Price: $5/month -
12
ReqKey
ReqKey
ReqKey adds API key authentication, usage credits, rate limiting and request analytics to an API you own. Your own middleware makes a single verify call per incoming request: ReqKey validates the caller’s key, deducts a credit from that consumer’s pool, enforces their rate limit, and records the request with status code, latency and location. It never sits in front of your API — no proxy, no gateway, no DNS change — so it adds no hop to your critical path. Validation averages under 5ms. Credits pool per consumer rather than per key, so issuing a customer a second key does not hand them a second quota, and balances stay synced across regions. Also included: shadow limits, controlled overage, reusable plans, low-credit alerts, and per-request logs filterable by endpoint, status, consumer and time range. ReqKey meters and tracks usage — you keep your own billing stack. SDKs for Python, Node.js, Go, Rust, PHP, .NET and Java, with framework adapters for FastAPI, Express, Django, and more.Starting Price: $0 (free tier), $25/month Pro -
13
Boomi
Boomi
Boomi is a leader in integration and automation, offering an intelligent iPaaS platform that connects applications, APIs, data, and AI agents to drive digital transformation. With its seamless integration capabilities, Boomi enables businesses to scale securely, automate workflows, and manage data effortlessly across diverse environments. The platform includes AI-powered features, robust API management, and real-time insights to help enterprises streamline their operations, optimize efficiency, and innovate without compromising security. Boomi Agentstudio is a comprehensive AI agent management platform that allows businesses to design, govern, and orchestrate AI agents at scale. It simplifies the management of AI agents across their entire lifecycle, from development to deployment. With tools that provide real-time insights, observability, and compliance, Boomi Agentstudio empowers enterprises to automate processes, optimize workflows, and drive hyperproductivity.Starting Price: $550.00/month -
14
Enterprise Universal ERP API
STFB Inc.
Enterprise Universal ERP API is a complete HTTP REST API with hundreds of accounting & ERP functions that you can use to add accounting and ERP functionality to your own applications! All basic Accounting and ERP functionality is included and made available via API calls! GL, AR, AP, OE, Inv, Warehousing, CRM, MRP, and ECommerce calls included. Since the Enterprise ERP API is implemented in stored procedures, and can be called either directly or via HTTP REST, ANY LANGUAGE or PLATFORM can be used to access the ERP business logic! IF the language / development environment / software platform can access MySQL or SQL Server, then it can use the ERP business logic directly! One of the BEST new features of this API, is that it will allow your company to hire outside developers to build sub-systems and add-ons to your software product WITHOUT having to SHARE THE SOURCE CODE WITH THEM! You can simply send your new outside developers the API Call List & API Documentation!Starting Price: $999.99 One Time -
15
AvAIO
SysAIO
At SysAIO, we create all-in-one software solutions to simplify complex operations. Our flagship product, AvAIO, is built for aviation—seamlessly managing reservations, operations, and management, all within in a single platform. Gain full oversight of your airline’s operations with advanced management tools covering compliance tracking, aircraft airworthiness, and maintenance scheduling. AvAIO centralizes critical data, automates reporting, and enhances decision-making, ensuring regulatory compliance, operational efficiency, and improved resource allocation. Deliver a seamless booking experience with integrated DCS, automated check-in options, and secure payment processing. AvAIO optimizes inventory management, reduces manual workload, and ensures a smooth reservation process—enhancing both passenger satisfaction and operational efficiency. Gain full oversight of your airline’s operations with advanced management tools. Visit our website for more details.Starting Price: $2000 per month -
16
Conholdate.Total For .NET
Aspose
Conholdate.Total for .NET is the complete package of all .NET APIs as offered by Aspose and GroupDocs. It empowers the developers to perform a wide range of document processing tasks from within their own .NET based applications. This .NET package is an all-in-one solution for all types of document managements systems because it offers the ability to create, edit, print, view, annotate, compare, sign, automate, search and convert between a wide range of popular document formats. Process a Multitude of File Formats - Conholdate.Total for .NET empowers you to build an incredibly versatile file processing system capable of handling many popular file formats. You can easily open, create, modify and convert file formats. Conholdate.Total for .NET currently supports following file types: Microsoft Word documents Microsoft Excel spreadsheets Microsoft PowerPoint presentations Adobe PDF documents Microsoft Outlook Microsoft Project files and more than 100 other file formatsStarting Price: $4,999 -
17
DreamFactory
DreamFactory Software
DreamFactory Software is the fastest way to build secure, internal REST APIs. Instantly generate APIs from any database with built-in enterprise security controls that operates on-premises, air-gapped, or in the cloud. Develop 4x faster, save 70% on new projects, remove project management uncertainty, focus talent on truly critical issues, win more clients, and integrate with newer & legacy technologies instantly as needed. DreamFactory is the easiest and fastest way to automatically generate, publish, manage, and secure REST APIs, convert SOAP to REST, and aggregate disparate data sources through a single API platform. See why companies like Disney, Bosch, Netgear, T-Mobile, Intel, and many more are embracing DreamFactory's innovative platform to get a competitive edge. Start a hosted trial or talk to our engineers to get access to an on-prem environment!Starting Price: $1500/month -
18
Connectbase
Connectbase
Connectbase's Industry Growth Cloud for connectivity is a system of intelligence around location to enable buyers and sellers to drive growth for connectivity providers. Combining location intelligence, workflow including planning, prospecting, pricing and market participation, along with the award winning ecosystem within The Connected World. Over 600 million locations are being managed to drive growth across 150+ service providers globally. -
19
Kong Konnect
Kong
Kong Konnect Enterprise Service Connectivity Platform brokers an organization’s information across all services. Built on top of Kong’s battle-tested core, Kong Konnect Enterprise enables customers to simplify management of APIs and microservices across hybrid-cloud and multi-cloud deployments. With Kong Konnect Enterprise, customers can proactively identify anomalies and threats, automate tasks, and improve visibility across their entire organization. Stop managing your applications and services, and start owning them with the Kong Konnect Enterprise Service Connectivity Platform. Kong Konnect Enterprise provides the industry’s lowest latency and highest scalability to ensure your services always perform at their best. Kong Konnect has a lightweight, open source core that allows you to optimize performance across all your services, no matter where they run. -
20
3scale
Red Hat
3scale is the API infrastructure to build on now, and for the future. We make it easy to manage your APIs for internal or external users. Share, secure, distribute. Control who gets access to your APIs. Implement your corporate business, usage, and governance policies from a simple console. Package APIs in the tiers of service that make sense for your business. Take advantage of a wide range of authentication patterns and credentials to create the safest interactions for your partners, customers, and users. Plan, design, implement, publish, govern, operate, analyze, optimize, and retire your APIs from a one continuous experience. Implement this lifecycle in an open standard devops pipeline. Foster a community of users with a sophisticated developer portal. Design your own systems for provisioning developers and provide the content and tools they need with a CMS out of the box. Provide interactive documentation to speed developers to productive use.Starting Price: $750 per month -
21
Autochat
Autochat.io
Live Chat that Sells for you. Do you think Live Chat is only a customer support tool? We would like to change your mind. Engage shoppers in real time before they get stuck or leave. Train bots to respond to common customer queries. Target shoppers based on their history and behavior. Automate common scenarios to engage shoppers 24x7. Power to influence and assist your shoppers throughout their purchase journey. Every customer conversation gets automatically augmented with activity trail from the current session and historical transactions. It helps respond to customer queries in the blink of an eye. Features like Proactive Messaging, Live Shopper Insights and Real-time Shopper Journeys help identify live shopping sessions with highest revenue potential. All our powerful features are available with a simple DIY graphical interface. Zero programming skills required. Our Deep Integration with Shopify starts powering your store automatically as soon as you install the app.Starting Price: $1 per month -
22
SheetDB
SheetDB
SheetDB will turn your sheets into a JSON API, easy to integrate with other tools and all programming languages. We have prepared many libraries working with common tools, other APIs and programming languages. If you work with non-IT people, use Google Sheets as a database for your projects. Spreadsheet is a great CMS that everyone know how to use! SheetDB is really easy to implement with any programming language. We take care about tokens and security stuff, so you can focus on your ideas.Starting Price: $19 per month -
23
APIMatic
APIMatic
Enable faster integrations of your API by providing multi-language SDKs with API reference docs, dynamic code samples, assisted authentication and more - all auto-generated to provide a comprehensive developer experience beyond any API documentation tool. Get programmatic access to APIMatic offerings via CodeGen-as-a-Service (CGaaS). Looking to build code generation directly into your CI/CD pipelines, update API docs on the fly, or publish a package to npm? CGaaS can assist wherever, whenever and however you want. CGaaS is available in flexible options like APIs and GitHub Actions. Effortlessly integrate your APIs, and drastically reduce time to update and release APIs or microservices with no fear of breaking changes.Starting Price: $15 per month -
24
Atatus
NamLabs Technologies
Atatus is a next-gen observability platform for modern, cloud-native systems, built for developers, DevOps engineers, and SREs who require deep visibility across applications and infrastructure. Trusted by organizations of all sizes and across diverse industries, Atatus provides a unified SaaS platform for comprehensive system monitoring. The platform combines metrics, logs, and traces to deliver full-stack observability across microservices, containers, and cloud environments. With distributed tracing, code-level performance analysis, and intelligent error detection, teams can pinpoint issues faster, understand system behavior, and minimize downtime. Atatus also delivers real-user experience and behavioral insights, helping teams connect application performance with how digital services are actually consumed.Starting Price: $49.00/month -
25
Apollo GraphOS
Apollo GraphQL
Apollo GraphOS is an API orchestration platform designed to help teams build, scale, and manage a unified supergraph across any number of services and applications. It brings together a secure, high-performance runtime layer with a centralized cloud management plane for seamless collaboration. Developers can unify REST APIs using Apollo Connectors, making it easy to migrate or integrate systems into GraphQL Federation. The GraphOS Router provides real-time capabilities, advanced caching, policy enforcement, and observability for large, distributed architectures. GraphOS Studio further enhances workflows with schema collaboration, CI/CD integration, and tooling that accelerates development. With flexible hosting options, GraphOS simplifies the delivery of modern, scalable GraphQL experiences.Starting Price: $49 per month -
26
Stream
GetStream.io
Why spend months building in-app activity feeds and messaging from scratch when you can implement in just weeks with Stream's activity feeds and in-app chat APIs? Stream's reliable APIs, developer-friendly SDKs, and flexible UI kits enable product teams to quickly integrate polished communication functionality often found in social media platforms such as WhatsApp, Facebook Messenger, and Instagram. With an industry-leading 99.999% uptime SLA, over a billion end users, and 5 million concurrent connections recently supported in a single chat channel, Stream's APIs are highly scalable, making them ideal for enterprise-grade businesses and growing startup platforms alike. Ship fully-featured activity feeds and in-app chat functionality faster with easy-to-use software components that give your product a competitive edge. -
27
Insomnia
Kong
Design, debug, and test APIs like a human, not a robot. Finally, a workflow you'll love. The Collaborative API Design Tool for designing, testing and managing OpenAPI specifications. The Desktop API client for REST and GraphQL. Make requests, inspect responses. Quickly create and group requests, specify environment variables, authentication, generate code snippets, and more. Get all the details on responses. View the whole request timeline, status codes, body, headers, cookies, and more. Create workspaces, folders, environments, drag-and-drop requests, and easily import and export your data. Create, edit, lint, debug, preview, and manage all of your OpenAPI specs in one collaborative API design editor. Generate configuration for common API gateways such as the Kong API Gateway, and Kong for Kubernetes. Sync your API designs with source control such as Github / Gitlab, and deploy directly to API Gateways such as Kong with one click.Starting Price: $5 per month -
28
Switchover
Takso
We help companies in every industry to accelerate their software development processes. Our clearly arranged feature flag solution allows you to switch your features on and off at any time. Use it for User Targeting, A/B Testing, Canary Releases, Experimenting and everything else you can think of.Starting Price: 0,-EUR -
29
API Science
API Science
APIs aren't just plumbing. They're critical to your business, your apps, and your reputation. That means you need to make sure they're always up, working and performing as they should. Don't let customers call you to tell you your API is down. Don't suffer bad app reviews because of slow or unreliable APIs. Traditional monitoring services were designed long before APIs became core to modern applications. API Science is designed specifically for monitoring APIs. Sure, we understand REST, JSON, OAuth, XML. No problem. Our worldwide API monitoring network lets you see how developers and apps really experience your APIs. You setup API monitors with your own tests. We then call your APIs (up to every minute) from around the world. If anything goes wrong we'll immediately let you know. Quickly identify performance issues, outages, errors. Troubleshoot faster and easier.Starting Price: $29 per month -
30
Stoplight
Stoplight
Stoplight is an API Design, Development, and Documentation platform. Use Stoplight Platform to enable consistency, reusability, and quality in your API lifecycle, all with an easy, enjoyable developer experience. Here's what you can do with Stoplight Platform: - Design APIs with our easy visual designer, Stoplight Studio - Mock API designs automatically with Stoplight Prism mocking - Collaborate on your designs and invite internal and external users to provide feedback - Develop faster and better APIs - Test and enforce against style guides with Stoplight Spectral - Document both internal and external APIs automatically to create a delightful experience Utilize and integrate design-first workflows to quickly scale up standardized, collaborative, and well-governed API programs.Starting Price: Free
