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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

OpenMail gives AI agents a dedicated email address. Provision an inbox with one CLI command or API call, each agent gets its own address, not a shared inbox or forwarding alias. Inbound email arrives instantly via webhook or WebSocket, parsed and threaded, with no polling required. Replies land in context so agents can respond without any new interface on the human side. Attachments: PDFs, CSVs, images, spreadsheets, Word documents are automatically converted to LLM-ready text; the agent never touches raw MIME. The API is small by design: one call to provision, standard calls to send, webhooks or WebSocket to receive. Integrates with LangChain, n8n, Make, Vercel AI SDK, and OpenClaw. Custom domains supported. Runs in the EU, GDPR-covered, 99.9% uptime SLA, SOC 2 in progress.

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

Developers, AI agent companies, software companies innovating with agentic technology

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

No images available

Pricing

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

Pricing

9 EUR
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 4.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 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 was playing with OpenClaw quite a bit when I hit a roadblock, which is it can't sign up to services? Luckily, OpenMail was here to help, I own them one.

Cons

  • The onboarding was a bit tricky with so many integrations to choose from. But I got some help from Discord, fast responses too.

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

OpenMail
Founded: 2026
Lithuania
Openmail.sh

Alternatives

JIterator

JIterator

Windex Inc

Alternatives

HttpMaster

HttpMaster

Borvid
Mailsac

Mailsac

Forking Software

Categories

Categories

API Testing Features

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

Integrations

LangChain
Make
OpenClaw
Vercel
n8n

Integrations

LangChain
Make
OpenClaw
Vercel
n8n
Claim API Tester and update features and information
Claim API Tester and update features and information
Claim OpenMail and update features and information
Claim OpenMail and update features and information