Best API Testing Tools with a Free Trial - Page 2
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Compare the Top API Testing Tools with a Free Trial as of December 2025 - Page 2
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1
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 -
2
Checkly
Pink Robots
Monitor the status and performance of your API endpoints & vital site transactions from a single, simple dashboard. Checkly is an active reliability platform that brings together the best of end-to-end testing and active monitoring to serve modern, cross-functional DevOps teams. With a focus on JavaScript-based Open Source tech stacks, Checkly is easy to get started with and seamlessly integrates into your development workflow. Checkly is the API & E2E monitoring platform for the modern stack: programmable, flexible and loving JavaScript. Monitor and validate your crucial site transactions. Take screenshots and get instant insights into what's working and what's not. Coding browser click-flows used to be hard. Not anymore. Use modern open source frameworks like Playwright and Puppeteer to automate your flows. Run your checks in 20 locations worldwide. Make sure your APIs always responds quickly and with the correct payload.Starting Price: $0.80 /10k API check runs -
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EthicalCheck
EthicalCheck
Submit API test requests via the UI form or invoke EthicalCheck API using cURL/Postman. Request input requires a public-facing OpenAPI Spec URL, an API authentication token valid for at least 10 mins, an active license key, and an email. EthicalCheck engine automatically creates and runs custom security tests for your APIs covering OWASP API Top 10 list Automatically removes false positives from the results, creates a custom developer-friendly report, and emails it to you. According to Gartner, APIs are the most-frequent attack vector. Hackers/bots have exploited API vulnerabilities resulting in major breaches across thousands of organizations. Only see real vulnerabilities; false positives are automatically separated. Generate enterprise-grade penetration test reports. Confidently share it with developers, customers, partners, and compliance teams. Using EthicalCheck is similar to running a private bug-bounty program.Starting Price: $99 one-time payment -
4
One APIMarketplace
DigitalAPICraft
Publish, consume, collaborate, accelerate your API journey, and enhance developer experience with our enterprise-grade, API platform-agnostic One APIMarketplace. Reduces API sprawl and API complexities through the operationalization of APIs, making them discoverable, consumable, easy to access, easy to collaborate, and more. One APIMarketplace brings down the time to market by effectively increasing the API adoption, through ease of access, API usage, and performance insights to boost the API consumption. Empower developers with intuitive documentation, community engagement, resources, SDKs, and sandboxes to accelerate API adoption. One APIMarketplace streamlines the discovery and usage of your APIs, guaranteeing a smooth and hassle-free experience for developers and businesses alike. Access comprehensive documentation and test APIs in a sandbox before integration. Gain insights into API usage, performance, and user behavior with our analytics dashboard.Starting Price: $99 per month -
5
Zoho QEngine
Zoho
Manage all test cases across platforms in one place, with Zoho QEngine's no-code, low-code as well manual coding features. Create, develop, manage and execute automated functional tests while collaborating with your team. Zoho QEngine's test automation software is everything you need to run your entire testing lifecycle. Zoho QEngine comes equipped to test web applications across browsers. With minimal coding/no-code build and manage automated test cases for web applications 10X faster. Automated testing for web applications is made simple with Zoho QEngine. With functionalities such as mobile emulators and simulators, Appium compatibility, and real devices Zoho QEngine ensures your test cases for mobile meets quality standards. Test, assert, manage, and automate all types of API requests and responses with Zoho QEngine's intuitive cloud-based API testing software. With interoperability API testing, Zoho QEngine has the functionalities you seek in a testing tool.Starting Price: $101.57 per month -
6
Testfully
Testfully
From powerful API client features to advanced testing and monitoring, Testfully does it all. Enjoy the flexibility of cloud and offline-only storage, seamless team collaboration, and easy migration, all in one multi-platform tool. Easily transfer your data from Postman or Insomnia directly into Testfully. Flexible and secure, set global, environment, and folder variables scoped to workspace or user. Customize auth, parameters, headers, and body to build any HTTP request easily. Work together effortlessly, add teams, assign roles, and control folder access. Supports major schemes like OAuth2 for secure and streamlined authorization. From basic to complex, Testfully enables quick, effective testing without the need for coding, making advanced API testing accessible and hassle-free. Execute all requests in a folder simultaneously, sequentially, or randomly with just one click. Validate responses and perform contract testing using a declarative format, no coding is needed.Starting Price: $49 per month -
7
Speedscale
Speedscale
Validate the performance and quality of your apps with real-world traffic scenarios. Preview code performance, quickly spot problems, and rest assured your app runs optimally when it’s time to release. Mimic real-life scenarios, test load, and create intelligent simulations of third-party and internal backend systems to better prepare for production. No need to spin up costly new environments each time you test. Built-in autoscaling drives your cloud costs down even further. Bypass complex, homegrown frameworks and manual test scripts so you can ship more code, faster. Be confident that new code changes can handle high-traffic scenarios. Prevent major outages, meet SLAs, and protect the customer experience. Simulate third-party systems and internal backends for more reliable, affordable testing. No need to spin up costly, end-to-end environments that take days to deploy. Seamlessly migrate off legacy architecture without disrupting the customer experience.Starting Price: $100 per GB -
8
Pynt
Pynt
Pynt is an innovative API Security Testing platform exposing verified API threats through simulated attacks. We help hundreds of companies such as Telefonica, Sage, Halodoc, and more, to continuously monitor, classify and attack poorly secured APIs, before hackers do. Pynt's leverages an integrated shift-left approach, and unique hack technology using home-grown attack scenarios, to detect real threats, discover APIs, suggest fixes to verified vulnerabilities, thereby eliminating the API attack surface risk. Thousands of companies rely on Pynt to secure the no. 1 attack surface - APIs, as part of their AppSec strategy.Starting Price: $1888/month -
9
Hoverfly Cloud
Hoverfly Cloud
Hoverfly Cloud is a SaaS API simulation solution, owned by iOCO, allowing you to speed up delivery, reduce costs, and get resilient software to market faster. Designed from the ground up for integration, automation, and performance, Hoverfly Cloud allows developers and test engineers to replace the APIs their applications depend on with flexible lightweight simulations. This decouples the development and testing process from unreliable, expensive test systems and restrictive API sandboxes. API simulations can be configured to reproduce unexpected API behaviors such as high latency or random failures, making it possible to ensure that applications respond gracefully when the APIs they depend on misbehave. Hoverfly Cloud offers extremely cost-effective running costs, even for extreme and complex testing. Create API mocks and simulations in minutes with a fully featured testing solution, uncluttered by costly, complex features.Starting Price: $10 per month -
10
Mocki
Mocki
If you want to create a simple API for testing purposes, simply enter a response body and get your custom API URL. Use Mocki to create a fully-fledged mock API. Using Mocki you can create, run, and deploy mock APIs. Use your mocks to design your API, serve static responses, simulate error scenarios, and remove dependencies to external services. Sign up today for a free 7-day trial. Sync your service with your code repository to keep your mock service up to date with the latest changes without manual steps. Using our managed hosting solution your mock service is always available for any consumer. Access a dashboard to gather insights on how your mock service is used. Using our open source CLI you can run your services locally. This enables you to run your service without requiring an internet connection to reach external services. A mock API can also be useful when testing backend apps. A common case is that your API or service needs to call external services over HTTP.Starting Price: $15 per month -
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Speakeasy
Speakeasy
Speakeasy is a platform that enhances API integration by generating handwritten, type-safe SDKs in over nine programming languages, including TypeScript, Python, Go, Java, and C#. These SDKs improve API integration times by up to 60% by eliminating the need for users to write boilerplate code, reducing common implementation errors, and expanding API accessibility across various programming communities. The platform also simplifies the creation of Terraform providers, allowing for the definition of resources and operations, automatic validation from OpenAPI specifications, and handling complex API landscapes. Additionally, Speakeasy offers end-to-end testing workflows to enforce API standards and protect against breaking changes, as well as SDK documentation that remains up-to-date with compilable usage snippets for every SDK method. Trusted by top API companies, Speakeasy's solutions are designed to provide robust SDKs, Terraform providers, and comprehensive testing tools.Starting Price: $250 per month -
12
Devzery
Devzery Technologies
Devzery is an AI-powered platform that revolutionizes API regression testing with codeless automation and seamless CI/CD integration. It enables teams to create, execute, and manage tests effortlessly, reducing manual effort while maximizing coverage. With support for multiple programming languages, Devzery caters to diverse environments, offering intelligent change detection, automated test case updates, and detailed reporting. It ensures comprehensive API validation, including performance and security testing, helping teams deliver robust, high-quality software faster. Perfect for startups and enterprises, Devzery streamlines QA, minimizes risks, and accelerates development timelines.Starting Price: $25 -
13
Qodex.ai
Qodex.ai
Qodex.ai is an AI-powered platform that streamlines API testing and documentation, offering full automation without human intervention. Developed by and for developers, it enables users to add tests in plain English, eliminating the need for coding. The system automatically adapts as products evolve, ensuring continuous test coverage. Users can upload existing API files or utilize Qodex's SDK to create new ones, ready for testing in minutes. The AI learns the API and generates tests automatically, with the option to create custom tests by writing requirements in simple English. Tests can be run anytime, providing easy-to-read reports to quickly identify and fix issues. The platform also offers interactive API documentation, allowing users to ask questions and receive instant answers in an intuitive interface. It is a reliable tool for both front-end as well as back-end testing.Starting Price: $199 per month -
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SwytchCode
SwytchCode
SwytchCode is an AI-powered “solutions engineer” platform that transforms API and SDK documentation into interactive developer experiences. It allows API publishers to upload an OpenAPI spec, Postman collection, or SDK, and within minutes, the system generates multilingual code samples (15+ programming languages), live playgrounds, and ready-to-run workflows that reduce developer integration time from hours to under two minutes. It supports smart testing with mock calls, analytics to surface developer drop-off or usage issues, and multi-step workflow generation via drag-and-drop or natural-language prompts, enabling API teams to significantly reduce support costs and improve adoption while maintaining high uptime and broad language support. With a mission to eliminate friction between APIs and developers, SwytchCode is a unified AI-driven interface that sits alongside your API.Starting Price: $19 per month -
15
Yethi Tenjin
Yethi
Take your enterprise software testing to the next level with Tenjin’s superior automated test suite powered by an intuitive and path-breaking algorithm that automatically “learns” the software’s UI and “re-learns” any changes without manual assistance. Adopt Tenjin today to benefit from immense savings in time, money, and resource strength. Tenjin Connect automates testing at the API level, enabling granular and faster test cycles in a multi-system environment; thereby facilitating early test adoption in today’s agile world. Multiple applications interacting via APIs have become the norm in a modern bank. With the adoption of API / Open Banking, the divide between internal and client facing systems is also getting blurry. Testing these platforms requires rapidly switching between API’s and the GUI. Comprehensive regression testing in integrated environments ensures you are able to balance agility with prudence. -
16
Katalon Studio
Katalon
An all-in-one test automation solution Get started in no time, scale up with no limit, for any team, at any level. Katalon Studio Robust test generation on all platforms Productive IDE to generate automated tests easily for all platforms and OSs, regardless of application complexity. Powerful recording utility for effortlessly storing all UI elements to maximize reusability. Codeless experience for beginners. Infinite testing extension for experts. Set Up Projects Built-in project templates Start immediately with ready-made templates, test case libraries, keywords, and object repositories. All kinds of end-to-end testing in one place Uniquely perform web, mobile, API, and desktop testing – all in a single project. -
17
Autostub
Torry Harris Business Solutions
AutoStub® is an essential tool to speed up API development. It can significantly reduce your build time by quickly designing, prototyping, documenting and testing APIs. AutoStub® creates a functional mock that allows developers to work with APIs before they are fully implemented. Available as a SaaS offering, for On-Premise deployments and in a hybrid model. Key Features Simulate ReST and SOAP services Input format - Swagger files for ReST, WSDL files for SOAP services Support for GET, POST, PUT, DELETE methods in ReST Create WSDL/Swagger 2.0 based mock services; generate dummy data for API testing Get an endpoint URL that can be used on a third party SOAP client tool Improves quality by facilitating functional testing Can handle multiple test scenarios together -
18
Apiary
Oracle
Write an API in 30 minutes. Share it with your teammates or customers. Let them use the API mock to take your API for a spin--without writing any code. Iterate, rinse & repeat. Coding can wait until you know what your developers really need. DNA for your API, powerful, open sourced and developer-friendly. The ease of Markdown combined with the power of automated mock servers, tests, validations, proxies, and code samples in your language bindings. It's often hard to see how an API will be used until you have the chance to code against it. What wireframes are for UI design, a server mock is for API design. A quick way to prototype an API - even before you start writing code. Two clicks will link Apiary to a repository of your choice. It’s up to you whether you make the API Blueprint private or public and let the community contribute. We update API docs every time you commit, and we push commits to the repo whenever you update your documentation at Apiary. It's a virtuous cycle. -
19
API Fortress
API Fortress
Discover a better breed of continuous API testing and monitoring that unifies functional, integration, and load testing across internal, partner, and third party APIs. Test REST, SOAP, GraphQL, Web Services, and Microservices. Automate tests as part of a CI pipeline. Monitor internal APIs continuously. Available by Hosted Cloud, Self-Hosted Cloud, or Hybrid. At many innovative organizations, continuous API quality is more than a competitive advantage - it’s the new normal. API Fortress allows any company to simplify continuous API quality, helping developers and test engineers to significantly accelerate time-to-market without increasing risk. Automatically create your first tests in seconds from a payload, spec file, or recorded API traffic. Then edit tests in your own IDE, our downloadable IDE Forge, or the simple drag-and-drop GUI. All tests are unlocked for painless editing as part of your existing workflow. -
20
Loadmill
Loadmill
Create automated API tests from real user sessions. Loadmill helps companies unclog the Dev pipeline, boost velocity and automate manual testing by replaying real user behavior. Eliminate regression bugs by replaying thousands of tests based on real user flows. Reduce your regression cycle duration and keep your team focused on what matters. Cut costs on ineffective testing efforts and maintenance. Automatically generate regression tests from real user recordings. Move fast and keep your team focused on what matters. Automate the entire QA process by replaying real user behavior. Integrate Loadmill into your continuous delivery pipeline and start shipping faster. Loadmill is using real traffic from websites around the world to test your server's performance. Get results fast - launch tests within seconds & detect bottle-necks before production. Truly distributed - unlimited unique IPs and locations per test. Record and replay your own user scenarios at scale. -
21
TestEngine
SmartBear
TestEngine is an optimized test execution engine for automating SoapUI and ReadyAPI tests at a tremendous scale. With flexible deployment options, TestEngine can be installed in any cloud or on-premise environment using Docker, VMs, Mac, Linux, or Windows, supporting centralized execution models or distributed options. Accelerate your delivery pipelines by executing tests concurrently with TestEngine. Run large test suites alongside shorter ad-hoc test cases with minimal infrastructure maintenance. TestEngine queues requests to execute tests as they arrive, staging projects being submitted during peak times. Results are returned to distributed clients as demand fluctuates, while also being stored for consumption later. Testing is an integral part of shipping and maintaining high-quality, stable applications and services. TestEngine allows teams to accelerate test executions while avoiding complex environments. -
22
Qyrus
Qyrus
Utilize web, mobile, API, and component testing for seamless digital user journeys. Test your web applications with confidence, our platform gives you the assurance you need when it comes to speed, efficiency, and cost reduction. Leverage the Qyrus web recorder, in an already low code no-code platform to build tests faster and reduce time to market. Maximize coverage across scripts using test-building features including data parameterization and global variables. Run comprehensive test suites on the go with the scheduled runs feature. Deploy AI-driven script repair to combat flakiness and brittleness due to element shifts and UI changes to ensure application functionality throughout the development life cycle. Manage the test data in one place, eliminating the tedious steps of importing data from external sources using Qyrus’ Test Data Management (TDM). Allow users to synthetically generate data within the TDM system for usage during runtime. -
23
Kusho
Kusho
Transform your Postman collection into exhaustive test suites that plug into your CI/CD pipeline. Simply add a link to your Postman collection and generate exhaustive test suites. You can also manually prompt Kusho AI with basic API details. Runs in sync with your development process and auto-updates. Modern software teams are all about multitasking, and writing test cases can take away hours of a developer's valuable time. At KushoAI, we’re building the first AI agent that takes API testing off a developer’s plate. Developers focus on what they do best, and product releases are smoother than ever. Generate exhaustive test suites for each API so you save hours of manual effort. Customizable to meet your company's context; simply input additional natural language prompts and get test code in seconds. KushoAI understands your natural language prompt and produces test case code instantly. KushoAI can auto-run relevant test suites at any stage of your CI/CD pipeline. -
24
KeyRunner
Launchiam
The Platform to Build, Test & Secure APIs. Transform how you design, test, and manage APIs. Collaborate easily, run tests locally, and protect sensitive data every step of the way. No Signup or Login Get started instantly—no need for lengthy sign-ups or logins. VS Code Extension & Desktop Apps Work where you're comfortable! Our VS Code extension and desktop apps integrate seamlessly with your existing workflow. Local Storage & Execution Keep data secure with local storage and execution, ensuring sensitive information stays on your device. Run Unlimited Collections Test and manage unlimited API collections, enabling effortless scaling for all your projects. Mock Servers Streamline development by creating mock servers for fast testing and API response simulation. Scriptless Testing & Playground Simplify testing with our user-friendly interface—experiment with APIs without writing any code. Our enterprise features take it even further. Contact us!Starting Price: $39/month/user -
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Testlemon
Testlemon
Get real, relevant followers, increase impressions, and build your network - all in one place.Starting Price: $10/month -
26
Requestly
RQ Labs, Inc.
Requestly API Client offers a range of tools to help you design, manage, and test APIs effectively. With distinct combination of features Requestly acts as a companion to developers and QAs. 1. Design APIs: Requestly simplifies API Design by allowing you to create individual API requests, specify HTTP methods, headers, query parameters, and request bodies. 2. Send API Requests: Sending API Requests is at the core of API testing. Responses can be viewed in detail, including status codes, headers, and payloads. 3. API Collections: Collections allow you to group related API requests for better organization and collaboration. 4. Variables: Requestly simplify API testing and management by allowing you to replace hardcoded values with placeholders - Collection, Environment, and Global Variables. 5. Scripts (Pre & Post): Scripts allow you to add logic or modify requests before they are sent, or process responses and manipulate variables that can be used in subsequent API call.Starting Price: $0 -
27
NativeRest
NativeSoft
NativeRest is a high-performance, memory-efficient REST API client available for Windows, macOS, and Linux. Unlike Electron-based apps, it is a fully native application, which results in faster startup times and significantly lower memory and CPU usage. NativeRest supports offline work with local and cloud-based workspaces, enabling both individual and team collaboration. It includes a preconfigured proxy server to enhance privacy and security during API testing. Users benefit from an intuitive interface, powerful environment variable management, customizable HTTP methods, and code snippet generation in over 15 programming languages. A portable version is also available, requiring no installation or admin rights.Starting Price: $199 -
28
Akamai API Security
Akamai
Akamai API Security is a vendor-neutral, platform-agnostic API threat protection solution that works across SaaS, on-premises, and hybrid environments, giving enterprises full visibility into their API estate regardless of where the APIs are deployed. It provides continuous API discovery and inventory, automated posture assessment of exposed APIs, runtime monitoring of API traffic (both north-south and east-west), behaviour analytics to detect anomalous or abusive API usage, and integrates with development workflows to test and remediate API-specific vulnerabilities earlier in the lifecycle. Key benefits include enabling teams to create a comprehensive inventory of APIs, identify and protect vulnerable endpoints, automate API security testing, and respond to API threats in real time, while integrating with existing gateways, WAFs, and infrastructure without requiring replacement of those tools. -
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TestWheel
TestWheel
TestWheel is an AI-powered, no-code platform that delivers fast, end-to-end automated testing for web, performance, API, and native mobile applications. Whether you’re transitioning from manual testing or moving away from open-source frameworks, TestWheel simplifies the process with codeless test creation and intuitive workflows. Our mission is to make software testing accessible for teams of all sizes through a comprehensive, easy-to-use framework. TestWheel offers the full range of AI-powered testing features available on the market, including an AI agent that writes test cases through natural language conversation. The platform supports self-healing tests, reducing maintenance time, and serves as a seamless transition tool—allowing teams to import existing manual tests from Jira, Azure DevOps, or Selenium scripts into a fully automated, self-healing, no-code suite. Free trials are available for teams, and we also provide custom integrations and on-premises solutions.Starting Price: $10/month -
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Leapwork
Leapwork
Leapwork has created the world’s most accessible automation platform. Through a visual, no-code approach, Leapwork makes it easy for business and IT users to automate repetitive processes, so enterprises can adopt and scale automation faster. Leapwork is used by more than 400 global enterprises across all industries, from banks and insurance companies to life science, government and aerospace. Clients include NASA, PayPal, BNP Paribas and Daimler. The company is headquartered in Copenhagen, Denmark, and has local offices across Europe, US and Asia.
