15 Best Postman Alternatives for API Testing (2026)

Postman alternatives at a glance (as of November 2026)

Use this table to shortlist by need. An API client is where you send, inspect, and debug requests. An API test automation tool is where you build test suites with assertions, test data, and reports, and run them in a pipeline.

Prices change often. Check each vendor's pricing page before you buy. Katalon Studio plans and add-ons are on the Katalon pricing page.

Where Postman still fits, and where it falls short

Postman is still a capable API platform. As of November 2026, every plan, including Free, includes the Collection Runner for automated collection runs, the Postman CLI for CI/CD, API monitors (1,000 requests a month on Free, 10,000 on paid plans), and local performance tests. Paid plans add cloud performance runs at $0.04 per virtual user hour.

The reasons teams look elsewhere are narrower than older articles suggest:

• Collaboration costs more since March 2026: the Free plan is limited to 1 user and cannot create a team, so a shared workspace now needs Team at $19 per user per month, billed annually.
• Some test features are paid: data-driven collection runs with CSV or JSON data files and monitor reports need Solo or above.
• Scripting is JavaScript only: pre-request and test scripts use Postman's JavaScript API, which suits developers more than testers who prefer keywords or Java.
• APIs only: Postman does not test web UIs, mobile apps, or desktop apps, so end-to-end flows that mix UI and API steps need a second tool.

If those points do not affect your team, Postman may still be the right choice. If they do, the tools below cover each gap differently.

API test automation tools

These tools are built to run API tests as repeatable suites (functional, and in JMeter's case load), with assertions, test data, reporting, and CI/CD runs.

1. Katalon Studio

Katalon Studio is a test automation tool for web, API, mobile, and desktop testing. For API work, it covers REST, SOAP, and GraphQL requests, and it imports existing work: you can import a Postman collection, REST requests from an OpenAPI (Swagger) file, or SOAP requests from a WSDL. Imported requests land in the Object Repository, where test cases reuse them.

A typical API test adds a Web Service keyword such as Send Request, then adds Verify Element Property Value to check a field in the response, without writing code. When you need more control, switch to script view and write Groovy or Java. The same test case can mix API steps with web or mobile steps, which helps when a UI flow depends on data an API created.

How the products split the work:

• Katalon Studio: authoring, local runs, data-driven tests, and debugging.
• Katalon Runtime Engine (KRE): runs Studio tests from the command line and in CI/CD tools such as Jenkins, GitHub Actions, Azure DevOps, and GitLab. KRE is an add-on.
• Katalon TestOps: test management, scheduling, and shared reports across runs.

Pros:

• One tool for API, web, mobile, and desktop tests, so mixed UI and API flows live in one project.
• Imports requests from Postman (collection format v2.1), OpenAPI 2.0 and 3.0, and WSDL, so you do not rebuild requests by hand.
• Keyword steps for testers, plus Groovy and Java scripting for engineers.
• Data-driven testing with basic data sources on every plan; database sources and data binding on Professional and above.

Cons:

• A desktop IDE is heavier than a lightweight client if you only need to send a few requests.
• Headless and CI/CD runs need Katalon Runtime Engine add-ons, and the Free plan does not include them.
• Desktop testing, parallel runs, AI self-healing, Cucumber BDD, and database data sources are Professional and above.
• Postman pre-request and test scripts are not converted, so assertions are rebuilt with Katalon keywords or Groovy.
• GraphQL support is basic next to dedicated GraphQL clients: requests run as RESTful calls over GET or POST, schema checks use a validation keyword, and the docs list GraphQL variables as not working yet.

Best for: QA teams that want API regression suites in CI and also test web, mobile, or desktop apps.

Pricing (as of November 2026): a Free plan for local authoring and runs; Professional at $1,800 per seat per year (about $150 a month), billed annually; Enterprise custom. There is a 30-day free trial. Katalon Runtime Engine (KRE), needed for CLI and CI/CD runs, is an add-on, and TestCloud, for cloud browsers and devices in UI tests, is a separate add-on. See the Katalon pricing page for the full plan comparison, and Katalon vs Postman for a head-to-head.

If your team needs training, Katalon Academy has free courses from Basic API Testing to Advanced API Testing.

2. ReadyAPI

ReadyAPI is SmartBear's commercial API testing suite, the paid sibling of SoapUI Open Source. It is sold in modules for functional and security testing, performance testing, and API virtualization, and it connects tests to data sources such as Excel, CSV, and databases.

Pros: deep SOAP and REST coverage, security scans, service virtualization for dependencies that are not ready, and data-driven tests.

Cons: licenses are priced per module and quoted by sales, and the desktop tool takes time to learn.

Best for: enterprise teams with large SOAP and REST estates that need security tests and virtualized services.

Pricing (as of November 2026): no list price on SmartBear's ReadyAPI pricing page; quotes come from SmartBear. Website: ReadyAPI

3. SoapUI Open Source

SoapUI Open Source is SmartBear's free desktop tool for SOAP and REST functional tests. Version 5.10.0 shipped in June 2026. It supports mock services, assertions, and command line runs.

Pros: free, mature SOAP support, mock services for testing in isolation.

Cons: data-driven testing is not available in the open source edition (it is a ReadyAPI feature), and the interface feels dated next to newer clients.

Best for: testers who need free SOAP and REST functional tests. For more options in this space, see our SoapUI alternatives guide.

Pricing (as of November 2026): free. Website: SoapUI

4. Karate

Karate is an open source (MIT) framework that combines API testing, API mocks, performance tests, and UI tests. Tests are written in a readable, Gherkin-style syntax, so you do not need Java step definitions for most API checks. Version 2.1.4 shipped in October 2026.

Pros: readable tests that live in Git, a built-in HTTP client and JSON assertions, HTML reports, and runs through standard Java build tools in CI.

Cons: no GUI for building requests; IDE support beyond the basics is a paid plugin, and teams still need a Java toolchain.

Best for: engineering-minded QA teams that want code-light API tests in the same repo as the service.

Pricing (as of November 2026): the core framework is free. IDE Plus is $100 per user per year, IDE Pro $640 per user per year, and Karate Enterprise is custom. Website: Karate Labs

5. REST Assured

REST Assured is an open source (Apache 2.0) Java library for testing REST services. You write tests in a given, when, then style and run them with JUnit or TestNG, so they fit any Java build and CI pipeline.

Pros: full control in code, easy to version and review, and no license cost.

Cons: Java skills required, no GUI, and no built-in reporting beyond what your test runner and plugins provide.

Best for: Java developers and SDETs who want API tests next to application code.

Pricing (as of November 2026): free. Git: REST Assured

6. Apache JMeter

Apache JMeter is an open source performance testing tool and an active Apache project (latest release 5.6.3). To test an API, you build a Test Plan with a Thread Group for virtual users, HTTP Request samplers, and assertions, then read results in listeners or an HTML dashboard.

Pros: free, scriptable from the command line for headless runs in CI, and widely documented.

Cons: built for load more than functional testing, and the Test Plan model takes time to learn. Postman now covers basic load tests too, so JMeter earns its place at higher volumes.

Best for: API load and performance testing.

Pricing (as of November 2026): free. Website: Apache JMeter

7. Testsigma

Testsigma is a cloud test automation platform for codeless API, web, and mobile tests. API responses can be validated with different comparison modes, and test data can be stored as parameters and reused across tests.

Pros: codeless authoring, API and UI tests in one cloud tool.

Cons: pricing is quote-only, and the open source community edition has had no release since August 2023.

Best for: teams that want codeless API and UI tests in a hosted platform.

Pricing (as of November 2026): Pro and Enterprise plans, both by quote. Website: Testsigma

API clients

These tools replace Postman's request builder: you send requests, inspect responses, and organize collections. Most add lightweight scripting and a CLI for CI.

8. Bruno

Bruno is an open source (MIT) API client that stores collections as plain text files (the Bru format) on your file system, so they go into Git with your code. It works offline and does not need an account. Version 4.3.0 shipped in October 2026.

Pros: offline and Git-friendly by design, a CLI for running collections in CI, and a free open source edition.

Cons: some team features sit in paid tiers, and the ecosystem of integrations is smaller than Postman's.

Best for: teams that want collections in Git and no cloud sync.

Pricing (as of November 2026): Open Source edition free; Pro $6, Ultimate $11, and Enterprise $18 per user per month, billed annually. Git: Bruno

9. Insomnia

Insomnia is Kong's open source (Apache 2.0) API client for REST, GraphQL, and gRPC. It stores projects locally, in the cloud, or in Git, and the Inso CLI runs collections and linting in CI.

Pros: a free Essentials plan with unlimited collection runs and Git Sync for up to 3 users, plus mock servers and design linting.

Cons: larger teams need paid plans, and its strength is API design and debugging more than test management.

Best for: developers who work across REST, GraphQL, and gRPC and want Git Sync, including on Mac.

Pricing (as of November 2026): Essentials free; Pro $12 per user per month; Enterprise $45 per user per month (self-serve up to 50 users), both billed annually. Website: Insomnia

10. Hoppscotch

Hoppscotch is an open source (MIT) API client that runs in the browser, as a desktop app, or self-hosted on your own servers. It supports HTTP, GraphQL, WebSocket, Socket.IO, MQTT, and Server-Sent Events. Because the code is public under MIT and it can be self-hosted, teams with data rules can keep requests inside their own network.

Pros: fast and light, usable without an account, and self-hostable for teams with data rules.

Cons: test scripting is lighter than in dedicated test tools, and team features such as SSO and audit logs are on paid plans.

Best for: quick requests in the browser, and teams that want to self-host their API client.

Pricing (as of November 2026): Free; Business $6 and Enterprise $11 per user per month, billed annually. Git: Hoppscotch

11. Thunder Client

Thunder Client is a REST API client that runs as a VS Code extension and a JetBrains plugin. Requests and collections stay on your computer, and paid plans add Git Sync for sharing them.

Pros: no context switching for developers, local storage, and a free plan that allows commercial use.

Cons: the Free plan caps you at 10 collections and 50 requests per collection, and Git Sync is paid.

Best for: developers who want to test endpoints inside their IDE.

Pricing (as of November 2026): Free; Starter $3, Business $7, and Enterprise $16 per user per month, billed annually. Website: Thunder Client

12. HTTPie

HTTPie is an open source (BSD-3) command line HTTP client with readable syntax and colorized output. It is a friendlier option than curl for everyday API debugging. A graphical web and desktop app is in public beta.

Pros: readable commands, built-in JSON support, persistent sessions, and runs on Linux, macOS, and Windows.

Cons: the CLI's last release was 3.2.4 in November 2024, and there are no collections or test reports in the CLI.

Best for: developers who debug APIs in the terminal.

Pricing (as of November 2026): the CLI is free. Website: HTTPie

13. Apidog

Apidog is an all-in-one API tool for design, documentation, mocking, and testing, with test scenarios that run in CI.

Pros: one app across the API lifecycle and a free plan to start.

Cons: not open source, and teams that already document APIs elsewhere may not need its design and docs features.

Best for: small teams that want design, docs, mocks, and tests in one place.

Pricing (as of November 2026): free plan; paid plans from $9 per user per month. Website: Apidog

14. Requestly

Requestly combines an API client with HTTP interception, so you can modify, redirect, or mock live traffic as well as send requests. Its API client covers REST, GraphQL, SOAP, WebSocket, gRPC, and MQTT, and its source code is on GitHub.

Pros: client and interceptor in one tool, which helps frontend developers mock APIs during UI work.

Cons: no permanent free plan on the pricing page (a 30-day trial instead), and testing features are lighter than in dedicated test tools.

Best for: frontend developers who debug and mock API traffic while building UIs.

Pricing (as of November 2026): Team $10 and Team Pro $15 per user per month, billed annually; Enterprise by quote. Website: Requestly

15. curl

curl is the open source command line tool for transferring data with URLs, available on almost every operating system. Version 8.23.0 shipped in October 2026.

Pros: already installed on most machines, fully scriptable, and supports HTTP, HTTPS, FTP, proxies, and many authentication options.

Cons: no collections, assertions, or reports; anything beyond a single request means writing shell scripts.

Best for: one-off requests and shell scripts in pipelines.

Pricing (as of November 2026): free. Website: curl

Free and open source Postman alternatives

If cost or data control drives the switch, these options are free and open source as of November 2026: Bruno (MIT), Hoppscotch (MIT), Insomnia (Apache 2.0), HTTPie CLI (BSD-3), and curl for API clients, and SoapUI Open Source, Karate (MIT), REST Assured (Apache 2.0), and Apache JMeter (Apache 2.0) for testing. Katalon Studio and Thunder Client are not open source, but both have free plans. For a wider list of free API test tools, see our guide to API testing tools.

Postman alternatives for Mac

Paw's successor, RapidAPI for Mac, is no longer developed, so Mac users who relied on it need a new client. Insomnia, Bruno, and Hoppscotch all have macOS desktop apps, and for automated API test suites, Katalon Studio, Karate, and REST Assured run on macOS.

Is Postman obsolete?

No. Postman is actively developed and widely used. What changed is its pricing: since March 2026 the Free plan is for 1 user only, and the old Basic plan was replaced by Team. Teams that only need a personal API client, or that want collections stored as files in Git, now have good free options. Teams that need cross-app regression testing look at test automation tools.

Is Swagger better than Postman?

They do different jobs. Swagger's open source tools (Swagger Editor, Swagger UI, and Swagger Codegen) help you design an OpenAPI definition, publish interactive docs, and generate server stubs and SDKs. SmartBear sells the commercial SwaggerHub for team design work. Postman is for sending, testing, and sharing requests. Many teams use both: they design in Swagger, then import the OpenAPI file into a client or a test tool such as Katalon Studio.

How to choose the right Postman alternative

Start with the job, not the feature list:

1. Decide whether you need a client or a test suite. If you mainly send and debug requests, pick an API client. If you need regression suites with assertions, test data, and CI runs, pick a test automation tool.
2. Check where collections live. Local files in Git (Bruno, Thunder Client, Insomnia Git Sync) suit code review workflows. Cloud workspaces suit wider sharing.
3. Match the skills on your team. Keyword or codeless steps (Katalon Studio, Testsigma) suit testers; code-first tools (REST Assured, Karate) suit developers and SDETs.
4. Price the whole team, not one seat. Check per-user prices, add-ons for CI runs, and which features sit on paid tiers.
5. Test your import path. Most tools import Postman collections or OpenAPI files. Try a real collection before you commit.

Verdict

Choose an API client such as Bruno, Insomnia, or Hoppscotch if you want a lighter, cheaper Postman for sending and debugging requests, especially if you want collections in Git. Choose Karate or REST Assured if your developers want API tests in code. Choose ReadyAPI for enterprise SOAP work with security tests and virtualization.

Choose Katalon Studio if your QA team needs API regression suites in CI and also tests web, mobile, or desktop apps, so API and UI checks share one project and one report. Stay with Postman if your team already relies on its shared workspaces and the Team plan price works for you.