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About

API Tester is a completely free mobile app available on iOS, Android, macOS, and watchOS. It is a functional API testing tool that allows users to complete compound tasks on any device. - Test any API on the go: REST, GraphQL, WebSocket, SOAP, JSON RPC, XML, HTTP, HTTPS. - GET, POST, PUT, PATCH, DELETE, etc. HTTP request methods are supported. - Perform the API calls with any kind of request data encoding and transfer type. - Import collections from Swagger, Postman, and YAML, or import requests using cURL, as well as export created requests via link or cURL. - Use a powerful GraphQL editor with full-scale experience. - WebSocket testing tool is available: handles connection and message exchange via WS or WSS. The API Tester mobile app allows you to get the job away from your workstation. Save time, work from anywhere!

About

Toolaska is a web-based platform that provides free online tools for developers, students, and tech professionals. It brings together a variety of utilities such as text converters, JSON formatters, API testers, encoders, hash generators, style converters, and time tools in one clean and easy-to-use place. Built with a focus on speed, simplicity, and privacy, Toolaska is designed to save time and reduce effort by offering reliable tools without ads, clutter, or distractions. It is continuously updated with new features to meet the real needs of developers and learners, making it a secure and all-in-one toolbox for everyday technical tasks.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Programmers and developers who design, debug, and test APIs

Audience

Toolaska is designed for developers, students, and tech enthusiasts who need fast, reliable, and privacy-focused online tools for code formatting, data conversion, encoding, and everyday development tasks.

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

Completely free
All features are available for free
Free Version
Free Trial

Pricing

$0
Free Version
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 4.5 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 4.0 / 5

Pros & Cons from Real Users

Pros

  • API Tester is free. The best GraphQL editor I ever saw. It gives the option to run literally any type of API. Easy import options. Pleasant user experience overall. Learning how to use the app wouldn't take too long.
  • Application is pretty simple, straightforward and works well. Validating Restful and SOAP APIs, WebSocket applications, as well as GraphQL applications has been a good experience using API Tester. All the underlying challenges that come to mind for testing backend applications are well served. What is more important - it's completely free and all features are available without any fees. This mobile app increased my productivity, and I can test APIs from anywhere on the planet using only a mobile device.

Cons

  • Not optimal for fully automated testing, but it would be unfair to demand this from a mobile solution.
  • The only cons is the lack of a desktop version. I think it could replace my other desktop alternatives.

Pros & Cons from Real Users

Pros

  • I’ve been using Toolaska JSON Tool for a while, and it has become one of my go-to utilities whenever I need to work with JSON. The interface is clean, lightweight, and fast — no unnecessary clutter. What I like the most: Format & Beautify: Makes even the messiest JSON instantly readable. Minify: Perfect for compressing before pushing to production. Validate: Quickly catches mistakes in JSON structure. Convert JSON ↔ CSV / XML / YAML: Saves a ton of time when working across formats. Escape / Unescape: Very useful for preparing JSON for APIs. Sort Keys: Keeps my files consistent and easier to manage. Download / Copy: No hassle in exporting results. Save Recent JSON: It remembers my last 10 JSON files locally, which is super handy when switching between tasks. The fact that it’s free, ad-free, and doesn’t require login makes it even better. Everything runs directly in the browser, so it’s quick and private.

Cons

  • Limited to JSON-related tasks → It doesn’t support other data formats (like TOML, INI, etc.) that some developers might use. No collaboration features → Everything is local, so you can’t share JSON edits or sessions directly with teammates. Local-only storage → The “recent JSON” feature only works in the same browser/device (no cloud sync). Basic UI → Very clean and minimal, but may feel too simple compared to full IDE plugins or desktop apps. No advanced JSON querying → Lacks features like JMESPath/JSONPath querying for deep data manipulation. Offline use → Needs an internet connection since it’s a web app (unless cached in browser).

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

API Tester
Founded: 2020
United Kingdom
apitester.org

Company Information

Toolaska
Founded: 2025
India
toolaska.com

Alternatives

JIterator

JIterator

Windex Inc

Alternatives

HttpMaster

HttpMaster

Borvid
JSON Crack

JSON Crack

ToDiagram
SoapUI

SoapUI

SmartBear

Categories

Categories

API Testing Features

Functional Testing
Fuzz Testing
Load Testing
Penetration Testing
Runtime and Error Detection
Security Testing
UI Testing
Validation Testing

Integrations

CSS
HTML
JSON
JavaScript

Integrations

CSS
HTML
JSON
JavaScript
Claim API Tester and update features and information
Claim API Tester and update features and information
Claim Toolaska and update features and information
Claim Toolaska and update features and information