CaspiAPI: API Client

CaspiAPI is a fast, native API client for developers — a Postman alternative for testing, debugging and automating REST APIs right from your device. Build requests, inspect responses, run whole collections and execute test scripts, all in one polished app that works offline and keeps your data encrypted on-device. Already using Postman? Import your collections and environments in seconds — your pre-request and test scripts run exactly as they do on desktop. BUILT FOR REAL WORK - Full REST/HTTP support — GET, POST, PUT, PATCH, DELETE and more - Multi-tab editor: query params, headers, body (JSON, form, raw), auth - Syntax-highlighted JSON responses with status, timing and size - Request history so you never lose what you sent POSTMAN-COMPATIBLE SCRIPTING - Run pre-request and test scripts with a real JavaScript engine - pm.* API support — pm.test, pm.environment, pm.response and more - Built-in CryptoJS for HMAC / SHA-256 signing and custom auth - Collection Runner runs requests in sequence and chains variables between them automatically POWERFUL VARIABLES & ENVIRONMENTS - 5-level variable scope — global, collection, environment and more - Switch environments instantly between dev, staging and prod - Edit any scope inline without leaving your request PRIVATE BY DESIGN - All data stored locally in an AES-256 encrypted database - The encryption key is protected by the Android Keystore — never stored in plain text - Works fully offline; your requests and secrets stay on your device CLEAN, FAST, NATIVE - Beautiful dark and light themes that follow your system - Touch-friendly UI with typography built for reading code - Lightweight and responsive, even on large collections Whether you're testing a production API, debugging a webhook, or running a full test suite, CaspiAPI gives you a focused, secure and genuinely fast workflow on the go. Download CaspiAPI and take your API workflow everywhere.