ApiClient : REST API Client

Abcoderz Software

Contains adsIn-app purchases

About this app

ApiClient is a mobile developer client to test, debug, and manage REST, GraphQL, and WebSocket APIs anytime, anywhere directly on your Android device.

No need to open your laptop just to test an API endpoint, inspect SSE event streams, test FCM push notifications, or generate code snippets. ApiClient gives you desktop-grade API testing power on mobile.

KEY FEATURES

1. Multi-Protocol API Testing
• REST Client: Support for GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS.
• GraphQL Suite: Dedicated Query and Variables editor with syntax formatting and error handling.
• Real-Time WebSockets: Connect to ws:// and wss:// endpoints with live frame logging, custom headers, and message composer.
• Live SSE Streaming: Inspect Server-Sent Events in real-time for AI and LLM streaming APIs.

2. Postman & OpenAPI Compatibility
• Postman Collections: Support for Postman Collection v1, v2.0, and v2.1 with multi-level nested folders.
• OpenAPI / Swagger: Import OpenAPI 2.0 and 3.0 specifications in both JSON and YAML.
• 1-Click cURL: Instant cURL import from clipboard and export to cURL.

3. 9-Language Code Generator
Convert API requests into clean, ready-to-run code snippets:
• Python (requests)
• JavaScript (fetch)
• Kotlin (OkHttp)
• Swift (URLSession)
• Dart / Flutter (http)
• Go (net/http)
• PHP (cURL)
• Java (OkHttp)
• cURL command

4. Push Notification Tester (FCM HTTP v1)
• FCM HTTP v1 support with on-device OAuth2 token generation.
• Import Service Account JSON securely or use Bearer tokens.
• Custom notification payloads and topic messaging.

5. Session Cookie Manager & Variables
• Automatic Cookie Jar captures response Set-Cookie headers.
• Domain-grouped cookie inspector with add, edit, and clear capabilities.
• Dynamic Variables: Use {{variable}} substitution across URLs, headers, and request bodies.

6. Developer Power Tools
• AI Response Diagnostics: Instant offline root-cause troubleshooting for HTTP errors.
• JSON Formatter: Beautify and minify JSON with syntax highlighting.
• Crypto Suite: Base64 and AES 128/256 Encryption and Decryption utilities.
• History & Collections: Auto-saves request history with search, export, and quick replay.

7. Modern UI & Dark Theme
• Full Dark and Light theme parity with automatic system theme synchronization.
• Clean, responsive interface optimized for all screen sizes.

8. 100% Private & Local-First
Your API keys, tokens, requests, and cookies stay strictly on your device. Zero cloud sync, zero telemetry, and zero middleman servers.

Ratings and reviews

Does a great job of sending a request and showing you the full response details. Handles a full range of response types with options to follow redirects or not as required and show all the response headers - would be nice if these were also available on the response view rather than just as a menu item.

This app is a must-have tool for developers who need to send HTTP requests quickly and efficiently. Its user interface is clean and easy to use, and it supports all HTTP methods. You can add custom headers and parameters, and save requests as templates. The app is fast and reliable. Highly recommended.

Great app easy to use. The 'send' button needs to be replaced to top or move up when the keypad is active, I have to tap 'back' to hide the keypad and use the 'send' button.

What’s new

🚀 What's New
• GraphQL & Real-Time WebSocket (ws/wss) client
• OpenAPI / Swagger (JSON/YAML) & 1-Click cURL import
• 9-Language Code Generator (Python, JS, Kotlin, Swift, Dart, Go, PHP, Java, cURL)
• FCM HTTP v1 Push Tester with OAuth2
• Live SSE Streaming Inspector for AI APIs
• Session Cookie Manager & {{variable}} engine
• Offline AI Response Diagnostics
• Seamless Dark/Light theme sync & UI improvements