Relay - HTTP Debugger

See every request your apps make. Relay captures the HTTP and HTTPS traffic on your device, decrypts it, and lays it out so the thing you are looking for is the first thing you see. Built for developers debugging their own apps, APIs and SDKs, with no computer, cable or proxy setup required. CAPTURE Tap record and requests stream in as apps make them. Relay runs a local VPN that routes web traffic through a proxy on the device itself. Nothing is sent to a server. ERRORS FIRST Failed requests and 4xx and 5xx responses stand out in the list, so you spot the broken call without hunting. Filter to errors, JSON, slow requests over 500 ms, or just your app. Group the list by app and collapse the noise. INSPECT Open any request for its headers, request body and response body. JSON is a foldable tree, images preview inline, and sensitive headers like Authorization and cookies stay masked until you tap them. Search across URLs and bodies. ACT ON IT Copy any request as cURL. Diff a response against the previous call to the same endpoint. Mock an endpoint with a canned response to test error states without touching your server. Export requests as HAR. HTTPS IN TWO STEPS Relay creates a certificate that only exists on your device. Install it and turn on trust, and Relay walks you through both steps and checks each one for you. The private key never leaves the device. HONEST ABOUT LIMITS Apps that pin their certificates cannot be decrypted, so Relay folds them into a single row instead of cluttering the list. Apps that bypass the system proxy, and connections that only speak HTTP/2 such as gRPC, pass through untouched. PRIVATE BY DESIGN Captured traffic stays on your device. No accounts, no ads, no tracking, and nothing is uploaded.