diff --git a/apps/ios/GoBridge/share.go b/apps/ios/GoBridge/share.go
index ad8dfc7..2f23e13 100644
--- a/apps/ios/GoBridge/share.go
+++ b/apps/ios/GoBridge/share.go
@@ -19,10 +19,10 @@ import (
 	"github.com/tzgyn/share/src/utils"
 )
 
-// DefaultRelay is the public relay the CLI uses when the user does not
-// pass --relay. The iOS app lets the user override it (for example with a
-// relay running on their Mac's LAN address).
-const DefaultRelay = "croc.schollz.com:9009"
+// DefaultRelay is the project's own relay, used by both the CLI and the
+// iOS app when the user does not override it. Point this at a Mac's LAN
+// address instead if you want to test with a local `share relay`.
+const DefaultRelay = "share.tzgyn.dev:9009"
 
 // status is the JSON shape the Swift app decodes from StatusJSON. It
 // mirrors swarm.RoomStatus but adds the session fields that live only on
diff --git a/apps/ios/README.md b/apps/ios/README.md
index 3ec77fe..cb28f17 100644
--- a/apps/ios/README.md
+++ b/apps/ios/README.md
@@ -94,9 +94,9 @@ xcrun devicectl device copy from --device <device> \
   callback is on the stack, not for the lifetime of a transfer.
 - Received files are written to `Documents/Received/`. `UIFileSharingEnabled`
   makes that folder visible in Files → On My iPhone → Share.
-- The default relay is `croc.schollz.com:9009`. For local transfers, run
-  `share relay` on a Mac and enter its LAN address (`192.168.x.x:9009`) under
-  Relay in the app.
+- The default relay is the project's own `share.tzgyn.dev:9009`; the CLI and
+  the iOS app both use it. For local transfers, run `share relay` on a Mac and
+  enter its LAN address (`192.168.x.x:9009`) under Relay in the app.
 
 ## Notes
 
diff --git a/apps/ios/Share/RoomView.swift b/apps/ios/Share/RoomView.swift
index 9ed8376..94da047 100644
--- a/apps/ios/Share/RoomView.swift
+++ b/apps/ios/Share/RoomView.swift
@@ -164,7 +164,7 @@ struct RoomView: View {
       HStack(spacing: 6) {
         Image(systemName: "network")
           .font(.system(size: 10, weight: .semibold))
-        Text(status.relay.isEmpty ? "public relay" : status.relay)
+        Text(status.relay.isEmpty ? "tzgyn relay" : status.relay)
           .lineLimit(1)
           .truncationMode(.middle)
       }
diff --git a/apps/ios/Share/SelfTest.swift b/apps/ios/Share/SelfTest.swift
index 10290e0..182d542 100644
--- a/apps/ios/Share/SelfTest.swift
+++ b/apps/ios/Share/SelfTest.swift
@@ -1,4 +1,5 @@
 import Foundation
+import Share
 import SwiftUI
 
 /// A headless-ish smoke test driven by launch arguments:
@@ -18,7 +19,7 @@ enum SelfTest {
   static func runIfRequested(model: AppModel) {
     let args = ProcessInfo.processInfo.arguments
     guard !started else { return }
-    let relay = value(after: "-shareSelfTestRelay", in: args) ?? "127.0.0.1:9009"
+    let relay = value(after: "-shareSelfTestRelay", in: args) ?? ShareRelayDefault()
     let code = value(after: "-shareSelfTestCode", in: args)
       ?? (args.contains("-shareSelfTestSend")
           ? "1234-selftest-send-apple"
diff --git a/apps/ios/Share/SetupView.swift b/apps/ios/Share/SetupView.swift
index 02c0857..cda9c09 100644
--- a/apps/ios/Share/SetupView.swift
+++ b/apps/ios/Share/SetupView.swift
@@ -286,14 +286,14 @@ struct SetupView: View {
             Image(systemName: "info.circle")
               .font(.system(size: 11, weight: .semibold))
               .padding(.top, 1)
-            Text("Use your Mac's LAN address, like 192.168.1.20:9009, when you run `share relay` there. Leave it empty for the public relay.")
+            Text("Use your Mac's LAN address, like 192.168.1.20:9009, when you run `share relay` there. Leave it empty for the tzgyn relay.")
               .font(.caption)
               .fixedSize(horizontal: false, vertical: true)
           }
           .foregroundStyle(Theme.tertiaryText)
 
           if !model.relay.isEmpty {
-            Button("Use public relay") {
+            Button("Use tzgyn relay") {
               model.relay = ShareRelayDefault()
             }
             .buttonStyle(QuietButtonStyle(tint: Theme.mint))
diff --git a/src/models/constants.go b/src/models/constants.go
index b90d083..ccca0b3 100644
--- a/src/models/constants.go
+++ b/src/models/constants.go
@@ -15,10 +15,12 @@ import (
 // TCP_BUFFER_SIZE is the maximum packet size
 const TCP_BUFFER_SIZE = 1024 * 64
 
-// DEFAULT_RELAY is the default relay used (can be set using --relay)
+// DEFAULT_RELAY is the default relay used (can be set using --relay).
+// The project runs its own relay at share.tzgyn.dev; both the CLI and the
+// iOS app default to it instead of the upstream croc relay.
 var (
-	DEFAULT_RELAY  = "croc.schollz.com"
-	DEFAULT_RELAY6 = "croc6.schollz.com"
+	DEFAULT_RELAY  = "share.tzgyn.dev"
+	DEFAULT_RELAY6 = "share.tzgyn.dev"
 	DEFAULT_PORT   = "9009"
 	INTERNAL_DNS   = false
 )