Compare the Top Small Business API Testing Tools as of April 2025

What are Small Business API Testing Tools?

API testing software is used to test and validate the functionality, performance, security, and reliability of Application Programming Interfaces (APIs). These tools help ensure that APIs perform as expected under various conditions and meet the required business and technical requirements. Features typically include automated testing, request/response validation, load testing, security testing (e.g., for vulnerabilities and authentication), and performance testing. API testing software often supports integration with continuous integration/continuous deployment (CI/CD) pipelines to facilitate automated testing as part of the software development lifecycle. Compare and read user reviews of the best Small Business API Testing tools currently available using the table below. This list is updated regularly.

  • 1
    NeoLoad

    NeoLoad

    Tricentis

    Continuous performance testing software to automate API and application load testing. Design code-less performance tests for complex applications. Script performance tests <as:code /> within automated pipelines for API testing. Design, maintain and run performance tests as code and analyze results within continuous integration pipelines using pre-packaged plugins for CI/CD tools and the NeoLoad API. Create test scripts quickly for large, complex applications using a graphical user interface and skip the complexity of hand coding new and updated tests. Define SLAs based on built-in monitoring metrics. Put pressure on the app and compare SLAs to server-level statistics to determine performance. Automate pass/fail triggers based on SLAs. Contributes to root cause analysis. Update test scripts faster with automatic test script updates. Update only the part of the test that’s changed and re-use the rest for easy test maintenance.
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  • 2
    Testsigma

    Testsigma

    Testsigma

    Testsigma is a low-code end-to-end software testing platform that works out of the box. It's built to enable modern Product teams to collaboratively plan, develop, execute, analyze, debug, and report on their automated testing—for websites, native Android and iOS apps, and APIs. Testsigma test scripts are code-agnostic. While the platform itself is built with Java, you can write test scripts in simple English or use the Test Recorder to generate airtight test scripts for websites and native mobile apps. You can also use the test recorder on your own device farm/grid or on Testsigma's built-in device lab on the cloud. The platform has built-in visual testing, parametrized or data-driven testing, 2FA testing, and more advanced features for easy test automation. Our AI automatically fixes unstable elements and test steps, identifies and isolates regression-affected scripts, and provides suggestions to help you find and fix test failures.
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  • 3
    TAST

    TAST

    SIPSA

    TAST, Test Automation System Tool is a comprehensive cloud test automation framework that enables businesses to maximize their test automation across the complete testing process from an End User´s perspective. It is easy to use and its graphical interface defines the automated test cases across technological platforms. TAST automates: *Cross Browser testing *Mobile testing *Desktop applications testing *DDBB testing: Oracle, PostgreSQL, MySQL, Db2. *File testing: txt, pdf, word, excel, csv, xml. *Mainframe testing: AS400, Host *APIs testing *Interface testing. *Remote Server testing. Types of tests you can automate with TAST: *Integration *Functional *System: Regressive, stress, load, parallel *Acceptance *A/B.
  • 4
    ZAPTEST

    ZAPTEST

    ZAPTEST Inc.

    ZAPTEST is a leading Free and Enterprise software test automation and RPA tool. Offerings include Computer Vision technology that allows for Cross-Platform digital interface automation for UI, API, Load testing, and RPA in a seamless process. Combine that with our 1SCRIPT methodology, seamless automation, parallel execution, and unlimited licenses– you get an efficient testing suite that generates up to 10X ROI. We promise that if you can perform a procedure via any digital interface (live application or mockup) manually, ZAPTEST can automate this procedure As-Is! With ZAPTEST’s Enterprise Solution subscription program, you receive unlimited licenses across the entire organization. Regardless of whether your automation needs increase, your cost remains fixed. FARM allows ZAPTEST users to manage all of their devices so you can remotely control cross-environments and projects from any location. ZAPTEST uses many practical applications to enhance its software testing software capabilities
  • 5
    Alithya GoTest
    Alithya GoTest is a collaborative test hub that is easy and quick to master and integrate, ensuring the quality of any professional digital solutions for companies requiring reliability without compromises. Ensure the quality of your application without sacrificing speed or agility with an easy-to-use, GUI test automation tool. Whether using scripts or not, our flexibility is unmatched, letting you create manual, automated or hybrid test suites for every desktop, web, and mobile application with ease including .Net, Java, WPF and Windows 10, modern JavaScript frameworks like React and Angular and iOS or Andoid with 2050+ browser and platform configurations. No need to jailbreak your devices. Alithya GoTest comes with a keyword library of over 1500 keywords, so you can ensure your GUI and API tests are scalable, robust, and easy to maintain. Alithya also offers consulting, coaching and training to ensure the success of your teams.
  • 6
    HttpMaster
    HttpMaster is a debugging and testing tool for various HTTP applications with special focus on web APIs and RESTful web services. Key features: - HttpMaster project to store complete definition of HTTP calls in one single place. - Broad set of HTTP properties (HTTP headers, URL encoding, etc.). - Dynamic parameters to simulate variations of input data or create global API values. - Response data validation with logical expressions. - Request chaining to use data from previous request with the next request. - Extensive data upload support, including 'multipart/form-data'. - Request data builder for creating request body with an optional dynamic parameters. - Request item execution with detailed progress monitoring. - Execution groups to create batches of requests. - Comprehensive execution data review and management. - Basic request tool for ad-hoc execution. - Command line interface. - PDF reports. - Support for cURL commands.
    Starting Price: Starting from $69
  • 7
    SOAPSonar

    SOAPSonar

    Crosscheck Networks

    Validate the functional behavior of APIs with client input simulations. Success criteria rules provide validation and regression testing of API behavior. Tests can be run on-demand or automated. Supports latest OpenAPI standards for automatically parsing OpenAPI documents and building test cases for all of the defined operations. Test authentication schemes including OAuth, SAML, PKI, Basic Auth, Amazon Auth, and Kerberos. Verify SSO tokens and cookies. Create behavior baselines and run regression tests to determine if any breakage or change of behavior occurs. Includes JSON and XML Diff capability. Test encryption and decryption of JSON, XML, REST, and SOAP message patterns. Simulate load from multiple virtual clients to measure and validate the performance criteria of the target APIs. Dynamic security and identity provide real world simulated inputs. Built-in support for AWSv4 signatures to authenticate to and test Amazon AWS APIs.
    Starting Price: $80/month
  • 8
    ACCELQ

    ACCELQ

    ACCELQ

    ACCELQ offers AI-powered No-Code test automation and management built on a cloud-native platform. ACCELQ provides a unified platform for web, mobile, API, database, and packaged apps. Automation-first, codeless capabilities make it easy to use for testing teams without deep programming expertise. ACCELQ allows businesses to achieve 3x productivity and over 70% savings with its industry-first autonomics-based automation platform. ACCELQ was named a leader in The Forrester Wave™: Continuous Automation Testing Platforms, Q4 2022. ACCELQ’s App Universe and predictive scenario designer enable the development of test scenarios based on path analysis and predictive analytics, and unique test data permutations are determined to provide coverage for all possible business process scenarios.
  • 9
    Katalon Studio
    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.
  • 10
    Leapwork

    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.
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