CaspiAPI: API Client

CaspiAPI is a fast, native API client for developers — a Postman alternative that runs beautifully on iPhone, iPad and Mac. Build requests, inspect responses, run whole collections and automate tests, all from one polished app that works offline and keeps your data encrypted on-device.

Already using Postman? Import your collections and environments in seconds and keep working — your pre-request and test scripts run exactly as they do on the 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 flows
• Collection Runner executes requests in sequence and chains variables: a value captured in one request is instantly available to the next

POWERFUL VARIABLES & ENVIRONMENTS

• 5-level variable scope — global, collection, environment, and beyond
• Switch environments instantly to move 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 lives in the Secure Enclave (Keychain) — never in plain text
• Works fully offline; your requests and secrets stay on your device

NATIVE ON EVERY SCREEN

• One app for iPhone, iPad and Mac — buy once, use everywhere
• Adaptive layout: touch-friendly action sheets on iOS, full menus on Mac
• Beautiful dark and light themes that follow your system automatically
• Clean typography built for reading code

Whether you're testing a production API on your phone, debugging a webhook on iPad, or running a full test suite on your Mac, CaspiAPI gives you a focused, secure and genuinely fast workflow.

Download CaspiAPI and bring your API workflow with you — everywhere.