Relay - API Client & Tester

6 Protocols, One Powerful App

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

6 protocols in one powerful app. Relay is the API client that Postman should have built for mobile. Test REST, WebSocket, GraphQL, gRPC, MQTT, and Socket.IO — all from your iPhone, iPad, or Mac. No laptop. No desktop app. No compromises. — WHY DEVELOPERS SWITCH TO RELAY: You're on the train and staging is down. You're in a meeting and someone asks "is that endpoint returning the right schema?" You're in bed at midnight and a webhook isn't firing. With Relay, the answer is always the same: open your phone, test it, fix it, move on. — 6 PROTOCOLS, ONE APP: Most mobile API tools only handle REST. Relay handles six: • REST/HTTP — GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS with full header, body, and auth control • WebSocket — Real-time bidirectional messaging with live connection status • GraphQL — Query editor with syntax highlighting, variables, and subscription support • gRPC — Server reflection and .proto file support • MQTT — Connect to IoT brokers with QoS levels and topic subscriptions • Socket.IO — Test event-driven real-time communication — ENTERPRISE AUTHENTICATION BUILT IN: Don't hack together auth headers manually. Relay supports: • Bearer Token & JWT • OAuth 1.0 & 2.0 (full flow) • Basic & Digest Authentication • API Key — header, query param, or cookie • AWS Signature v4 • Hawk Authentication • Akamai EdgeGrid Your staging environment uses OAuth? Your production API uses AWS Sig v4? Relay handles both without leaving the app. — GENERATE CODE IN 20+ LANGUAGES: Build your request visually, then export it as production-ready code: Swift, Kotlin, Python, JavaScript, Go, Rust, PHP, Ruby, C#, Java, Dart, cURL, and more. Perfect for prototyping, sharing with teammates, or dropping straight into your codebase. — IMPORT EVERYTHING, START IN SECONDS: • Postman Cloud Sync — Import your existing workspaces in one tap • cURL Import — Paste a cURL command and Relay builds the request • OpenAPI / Swagger — Import full API specs • HAR Files — Import browser network recordings • APIs.guru Directory — Browse and test 2,500+ public APIs instantly Already invested in Postman? You don't have to start over. Bring your work with you. — ORGANIZE LIKE A PRO: • Collections — Group requests into folders by project, team, or API • Environments — One tap to switch between dev, staging, and production • Variables — Use {{dynamic_variables}} in URLs, headers, and request bodies • History — Every request saved and searchable • Cookie Manager — Full visibility and control over stored cookies — DESIGNED FOR DEVELOPERS, NOT COMMITTEES: • Dark mode that actually looks good at 2am • Syntax highlighting for JSON, XML, and HTML responses • Response metrics — status, time, size at a glance • Clean, fast, no bloat — YOUR DATA STAYS YOURS: Relay is privacy-first. Your API keys, tokens, and request data live on your device. We don't track your requests, log your endpoints, or store your credentials on our servers. Period. — WHO RELAY IS FOR: • Backend developers tired of switching to a laptop to test an endpoint • Mobile engineers who need to verify API responses on real devices • DevOps and SRE teams debugging production APIs from anywhere • QA testers running API checks without a full workstation • Full-stack developers who move between protocols daily — Free to start. No account required. Just open and test. Questions or feature requests? We actually read every email: askrelay@gmail.com Terms of Use: https://github.com/mGungorr/relay-legal/blob/main/terms-of-service.md Privacy Policy: https://github.com/mGungorr/relay-legal/blob/main/privacy-policy.md

Ratings & Reviews

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Bug fixes and improved stability.

Version 1.1.1

The developer, MUSTAFA GUENGOER, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer indicated that this app supports the following accessibility features. Learn More

  • Supported Features

    • Dark Interface

    • Differentiate Without Color Alone

    • Sufficient Contrast

Information

Seller
  • MUSTAFA GUENGOER
Size
  • 59.5 MB
Category
  • Developer Tools
Compatibility
Requires iOS 13.0 or later.
  • iPhone
    Requires iOS 13.0 or later.
  • iPad
    Requires iPadOS 13.0 or later.
  • iPod touch
    Requires iOS 13.0 or later.
  • Mac
    Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
  • Relay Pro Lifetime $59.99
  • Relay Pro $19.99
  • Relay Pro $3.99
  • Learn More
Copyright
  • © 2025 GNGR
  • Privacy Policy
  • License Agreement

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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