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.
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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.
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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
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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.
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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.
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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.
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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
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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
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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.
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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
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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
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