diff --git a/compiler/Cargo.lock b/compiler/Cargo.lock
index c435308efb11f..4e45d68101942 100644
--- a/compiler/Cargo.lock
+++ b/compiler/Cargo.lock
@@ -108,6 +108,12 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "bumpalo"
+version = "3.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
+
 [[package]]
 name = "byteorder"
 version = "1.3.4"
@@ -142,6 +148,12 @@ dependencies = [
  "jobserver",
 ]
 
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -235,6 +247,16 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2382f75942f4b3be3690fe4f86365e9c853c1587d6ee58212cebf6e2a9ccd101"
 
+[[package]]
+name = "console_error_panic_hook"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06aeb73f470f66dcdbf7223caeebb85984942f22f1adb2a088cf9668146bbbc"
+dependencies = [
+ "cfg-if 1.0.0",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.1"
@@ -266,7 +288,7 @@ version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ae5588f6b3c3cb05239e90bd110f257254aecd01e4635400391aeae07497845"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "crossbeam-channel",
  "crossbeam-deque",
  "crossbeam-epoch",
@@ -280,7 +302,7 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dca26ee1f8d361640700bde38b2c37d8c22b3ce2d360e1fc1c74ea4b0aa7d775"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "crossbeam-utils",
 ]
 
@@ -290,7 +312,7 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "715e8152b692bba2d374b53d4875445368fdf21a94751410af607a5ac677d1fc"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "crossbeam-epoch",
  "crossbeam-utils",
 ]
@@ -301,7 +323,7 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ec02e091aa634e2c3ada4a392989e7c3116673ef0ac5b72232439094d73b7fd"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "crossbeam-utils",
  "lazy_static",
  "memoffset",
@@ -314,7 +336,7 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b10ddc024425c88c2ad148c1b0fd53f4c6d38db9697c9f1588381212fa657c9"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "crossbeam-utils",
 ]
 
@@ -324,7 +346,7 @@ version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0bf124c720b7686e3c2663cf54062ab0f68a88af2fb6a030e87e30bf721fcb38"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "lazy_static",
 ]
 
@@ -354,7 +376,7 @@ version = "5.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "907076dfda823b0b36d2a1bb5f90c96660a5bbcd7729e10727f07858f22c4edc"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "hashbrown",
  "lock_api",
  "once_cell",
@@ -651,7 +673,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "libc",
  "wasi 0.10.2+wasi-snapshot-preview1",
 ]
@@ -925,7 +947,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "61124eeebbd69b8190558df225adf7e4caafce0d743919e5d6b19652314ec5ec"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
 ]
 
 [[package]]
@@ -1023,6 +1045,15 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "js-sys"
+version = "0.3.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f37a4a5928311ac501dee68b3c7613a1037d0edb30c8e5427bd832d55d1b790"
+dependencies = [
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -1063,7 +1094,7 @@ version = "0.4.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "value-bag",
 ]
 
@@ -1151,6 +1182,12 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "memory_units"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8452105ba047068f40ff7093dd1d9da90898e63dd61736462e9cdda6a90ad3c3"
+
 [[package]]
 name = "mio"
 version = "0.8.4"
@@ -1223,7 +1260,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "038d43985d1ddca7a9900630d8cd031b56e4794eecc2e9ea39dd17aa04399a70"
 dependencies = [
  "bitflags",
- "cfg-if",
+ "cfg-if 1.0.0",
  "foreign-types",
  "lazy_static",
  "libc",
@@ -1304,7 +1341,7 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4dc9e0dc2adc1c69d09143aff38d3d30c5c3f0df0dad82e6d25547af174ebec0"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "libc",
  "redox_syscall 0.2.10",
  "smallvec",
@@ -1592,6 +1629,30 @@ dependencies = [
  "zstd",
 ]
 
+[[package]]
+name = "relay-compiler-playground"
+version = "0.0.3"
+dependencies = [
+ "common",
+ "console_error_panic_hook",
+ "fnv",
+ "graphql-ir",
+ "graphql-syntax",
+ "graphql-text-printer",
+ "intern",
+ "relay-codegen",
+ "relay-config",
+ "relay-schema",
+ "relay-transforms",
+ "relay-typegen",
+ "schema",
+ "serde",
+ "serde_json",
+ "wasm-bindgen",
+ "wasm-bindgen-test",
+ "wee_alloc",
+]
+
 [[package]]
 name = "relay-config"
 version = "0.0.0"
@@ -1888,6 +1949,12 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "scoped-tls"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1cf6437eb19a8f4a6cc0f7dca544973b0b78843adbfeb3683d1a94a0024a294"
+
 [[package]]
 name = "scopeguard"
 version = "1.1.0"
@@ -1987,7 +2054,7 @@ version = "0.10.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f04293dc80c3993519f2d7f6f511707ee7094fe0c6d3406feb330cdb3540eba3"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "cpufeatures",
  "digest",
 ]
@@ -1998,7 +2065,7 @@ version = "0.10.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "cpufeatures",
  "digest",
 ]
@@ -2122,7 +2189,7 @@ version = "3.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9fbec84f381d5795b08656e4912bec604d162bff9291d6189a78f4c8ab87998"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "fastrand",
  "redox_syscall 0.3.5",
  "rustix 0.37.19",
@@ -2287,7 +2354,7 @@ version = "0.1.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "01ebdc2bb4498ab1ab5f5b73c5803825e60199229ccba0698170e3be0e7f959f"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "pin-project-lite",
  "tracing-core",
 ]
@@ -2427,6 +2494,96 @@ version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5bba0e8cb82ba49ff4e229459ff22a191bbe9a1cb3a341610c9c33efc27ddf73"
+dependencies = [
+ "cfg-if 1.0.0",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b04bc93f9d6bdee709f6bd2118f57dd6679cf1176a1af464fca3ab0d66d8fb"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d1985d03709c53167ce907ff394f5316aa22cb4e12761295c5dc57dacb6297e"
+dependencies = [
+ "cfg-if 1.0.0",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14d6b024f1a526bb0234f52840389927257beb670610081360e5a03c5df9c258"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e128beba882dd1eb6200e1dc92ae6c5dbaa4311aa7bb211ca035779e5efc39f8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed9d5b4305409d1fc9482fee2d7f9bcbf24b3972bf59817ef757e23982242a93"
+
+[[package]]
+name = "wasm-bindgen-test"
+version = "0.3.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9e636f3a428ff62b3742ebc3c70e254dfe12b8c2b469d688ea59cdd4abcf502"
+dependencies = [
+ "console_error_panic_hook",
+ "js-sys",
+ "scoped-tls",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "wasm-bindgen-test-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-test-macro"
+version = "0.3.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f18c1fad2f7c4958e7bcce014fa212f59a65d5e3721d0f77e6c0b27ede936ba3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+]
+
 [[package]]
 name = "watchman_client"
 version = "0.8.0"
@@ -2445,6 +2602,28 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "web-sys"
+version = "0.3.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bdd9ef4e984da1187bf8110c5cf5b845fbc87a23602cdf912386a76fcd3a7c2"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "wee_alloc"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbb3b5a6b2bb17cb6ad44a2e68a43e8d2722c997da10e928665c72ec6c0a0b8e"
+dependencies = [
+ "cfg-if 0.1.10",
+ "libc",
+ "memory_units",
+ "winapi",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
diff --git a/compiler/Cargo.toml b/compiler/Cargo.toml
index d9a1fdda6e819..e2efa8bd846c4 100644
--- a/compiler/Cargo.toml
+++ b/compiler/Cargo.toml
@@ -17,6 +17,7 @@ members = [
     "crates/relay-bin",
     "crates/relay-codegen",
     "crates/relay-compiler",
+    "crates/relay-compiler-playground",
     "crates/relay-lsp",
     "crates/relay-schema",
     "crates/relay-test-schema",
diff --git a/website/src/compiler-explorer/ExplorerStateConstants.js b/website/src/compiler-explorer/ExplorerStateConstants.js
index 6bcb03161aba9..d90f65b65af9d 100644
--- a/website/src/compiler-explorer/ExplorerStateConstants.js
+++ b/website/src/compiler-explorer/ExplorerStateConstants.js
@@ -37,12 +37,6 @@ fragment AgeFragment on User {
  `.trim();
 
 export const FEATURE_FLAGS = [
-  {
-    key: 'enable_flight_transform',
-    label: 'Flight Transforms',
-    kind: 'bool',
-    default: true,
-  },
   {
     key: 'hash_supported_argument',
     label: 'Hash Supported Argument',
@@ -68,12 +62,6 @@ export const FEATURE_FLAGS = [
     kind: 'enum',
     default: true,
   },
-  {
-    key: 'enable_client_edges',
-    label: 'Client Edges',
-    kind: 'enum',
-    default: true,
-  },
 ];
 
 export const DEFAULT_STATE = {