Why Developers Are Switching to Browser-Based API Testing

If you've ever needed to quickly test an API endpoint, you know the pain: download Postman (500MB+), create an account, wait for updates, manage workspaces... all just to send a simple GET request.

What if you could test any REST or SOAP API instantly — right in your browser?

That's exactly what SUDTCore's REST Web Client and SOAP Web Client deliver. Zero downloads. Zero sign-ups. Just open the URL and start testing.

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The Problem with Desktop API Clients

Postman

Postman is powerful, but it comes with significant overhead:

• 500MB+ download — heavier than most IDEs
• Mandatory sign-in — can't even use it without creating an account
• Electron-based — consumes 300-500MB RAM just sitting idle
• Feature bloat — monitors, flows, environments... most developers just want to send a request
• Paid features — collaboration and advanced features require a subscription

SoapUI

For SOAP testing, the situation is worse:

• Requires Java Runtime — another dependency to manage
• 200MB+ download — and a slow, dated UI
• Steep learning curve — complex interface for simple SOAP calls
• SmartBear upselling — constant prompts to upgrade to the paid version

Insomnia & Thunder Client

• Insomnia recently added mandatory cloud sync and account requirements
• Thunder Client is VS Code-only — not available outside the editor

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The SUDTCore Solution: API Testing in Your Browser

🚀 REST Web Client — Postman Alternative

Our REST Web Client provides everything you need for REST API testing:

Full HTTP Method Support

• GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS
• Custom headers with enable/disable toggles
• Request body with JSON, XML, and plain text format switching

Smart Features

• 🔄 CORS Proxy — Test any API without browser restrictions
• 💾 Save & Organize — Collections with organizations and projects (like Postman)
• 📊 Response Inspector — Status codes, timing, headers, and formatted body
• 🔒 Security — Requests proxied through secure cloud backend; responses are never stored

Who is it for?

• Frontend developers testing backend APIs
• QA engineers validating endpoints
• Backend developers debugging their services
• Students learning about REST APIs
• Anyone who needs to quickly test an HTTP endpoint

📜 SOAP Web Client — SoapUI Alternative

Our SOAP Web Client is purpose-built for enterprise SOAP testing:

Enterprise-Ready Features

• Custom SOAP XML envelope editor
• Dedicated SOAPAction header field
• Support for SOAP 1.1 and 1.2
• Full XML response viewer with headers

Perfect for:

• Enterprise developers working with financial APIs (banking, payments)
• Integration engineers connecting to legacy systems
• Healthcare developers working with HL7/FHIR SOAP services
• Government systems that mandate SOAP/XML protocols

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Feature Comparison

| Feature | SUDTCore | Postman | SoapUI | Insomnia | |---------|----------|---------|--------|----------| | Price | Free | Freemium | Freemium | Freemium | | Installation | None | 500MB+ | 200MB+ | 200MB+ | | Sign-up Required | No | Yes | No | Yes | | REST Support | ✅ | ✅ | ✅ | ✅ | | SOAP Support | ✅ | ❌ | ✅ | ❌ | | JSON Body | ✅ | ✅ | ✅ | ✅ | | XML Body | ✅ | ✅ | ✅ | ✅ | | CORS Proxy | ✅ Built-in | ❌ | N/A | ❌ | | Save Collections | ✅ | ✅ | ✅ | ✅ | | Cross-device Sync | ✅ (with login) | ✅ (paid) | ❌ | ✅ (paid) | | Works on Mobile | ✅ | ❌ | ❌ | ❌ | | Response Storage | Never | Cloud | Local | Cloud |

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Security & Privacy

One of our core principles: we never store API responses.

When you use SUDTCore's REST or SOAP client:

• Your request is routed through our secure cloud proxy server
• The proxy forwards your request to the target API and returns the response
• The response exists only in your browser session — it's never logged, stored, or cached on our servers
• When you save a request to a collection, only the URL, method, headers, and body template are stored — never any response data

This makes SUDTCore ideal for testing APIs that handle sensitive data — financial endpoints, healthcare APIs, authentication services, and more.

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How to Get Started

Testing a REST API

1. Go to SUDTCore REST Client
2. Select your HTTP method (GET, POST, etc.)
3. Enter the API URL
4. Add headers if needed (Authorization, Content-Type, etc.)
5. For POST/PUT, switch body format (JSON/XML/Text) and enter your payload
6. Click Send — view the response instantly
7. Click Save to store the request in a collection for later

Testing a SOAP Service

1. Go to SUDTCore SOAP Client
2. Enter the WSDL/endpoint URL
3. Set the SOAPAction header value
4. Paste or write your SOAP XML envelope
5. Click Invoke Service — view the XML response
6. Click Save to store the envelope for reuse

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When to Use SUDTCore vs. Postman

Use SUDTCore when:

• You need to quickly test an endpoint without installing anything
• You're on a shared/restricted computer (library, office, client site)
• You want to test from a tablet or phone
• You need CORS bypass without browser extensions
• You're working with SOAP services and don't want to install SoapUI
• Privacy is critical and you don't want responses stored in the cloud

Use Postman when:

• You need advanced features like test scripts, newman CLI, or mock servers
• Your entire team is already on Postman's paid plan
• You need environment variable management across large projects

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Try It Now

Stop downloading software just to send an HTTP request. SUDTCore's API clients are free, instant, and secure.

👉 Open REST Web Client — Test REST APIs now

👉 Open SOAP Web Client — Test SOAP services now

No sign-up. No installation. Just open and test.