diff --git a/packages/utils/src/env.ts b/packages/utils/src/env.ts
index 101be14e6e2c..8d622f8836cd 100644
--- a/packages/utils/src/env.ts
+++ b/packages/utils/src/env.ts
@@ -7,7 +7,7 @@
  *
  * Attention:
  * This file should not be used to define constants/flags that are intended to be used for tree-shaking conducted by
- * users. These fags should live in their respective packages, as we identified user tooling (specifically webpack)
+ * users. These flags should live in their respective packages, as we identified user tooling (specifically webpack)
  * having issues tree-shaking these constants across package boundaries.
  * An example for this is the __SENTRY_DEBUG__ constant. It is declared in each package individually because we want
  * users to be able to shake away expressions that it guards.
@@ -15,6 +15,8 @@
 
 declare const __SENTRY_BROWSER_BUNDLE__: boolean | undefined;
 
+type SdkSource = 'npm' | 'cdn' | 'loader';
+
 /**
  * Figures out if we're building a browser bundle.
  *
@@ -23,3 +25,11 @@ declare const __SENTRY_BROWSER_BUNDLE__: boolean | undefined;
 export function isBrowserBundle(): boolean {
   return typeof __SENTRY_BROWSER_BUNDLE__ !== 'undefined' && !!__SENTRY_BROWSER_BUNDLE__;
 }
+
+/**
+ * Get source of SDK.
+ */
+export function getSDKSource(): SdkSource {
+  // @ts-ignore __SENTRY_SDK_SOURCE__ is injected by rollup during build process
+  return __SENTRY_SDK_SOURCE__;
+}
diff --git a/rollup/bundleHelpers.js b/rollup/bundleHelpers.js
index 5e1772b99ea1..43a5f26563d9 100644
--- a/rollup/bundleHelpers.js
+++ b/rollup/bundleHelpers.js
@@ -17,6 +17,7 @@ import {
   makeTerserPlugin,
   makeTSPlugin,
   makeExcludeReplayPlugin,
+  makeSetSDKSourcePlugin,
 } from './plugins/index.js';
 import { mergePlugins } from './utils';
 
@@ -141,6 +142,7 @@ export function makeBundleConfigVariants(baseConfig, options = {}) {
   const includeDebuggingPlugin = makeIsDebugBuildPlugin(true);
   const stripDebuggingPlugin = makeIsDebugBuildPlugin(false);
   const terserPlugin = makeTerserPlugin();
+  const setSdkSourcePlugin = makeSetSDKSourcePlugin('cdn');
 
   // The additional options to use for each variant we're going to create.
   const variantSpecificConfigMap = {
@@ -148,21 +150,21 @@ export function makeBundleConfigVariants(baseConfig, options = {}) {
       output: {
         entryFileNames: chunkInfo => `${baseConfig.output.entryFileNames(chunkInfo)}.js`,
       },
-      plugins: [includeDebuggingPlugin],
+      plugins: [includeDebuggingPlugin, setSdkSourcePlugin],
     },
 
     '.min.js': {
       output: {
         entryFileNames: chunkInfo => `${baseConfig.output.entryFileNames(chunkInfo)}.min.js`,
       },
-      plugins: [stripDebuggingPlugin, terserPlugin],
+      plugins: [stripDebuggingPlugin, setSdkSourcePlugin, terserPlugin],
     },
 
     '.debug.min.js': {
       output: {
         entryFileNames: chunkInfo => `${baseConfig.output.entryFileNames(chunkInfo)}.debug.min.js`,
       },
-      plugins: [includeDebuggingPlugin, terserPlugin],
+      plugins: [includeDebuggingPlugin, setSdkSourcePlugin, terserPlugin],
     },
   };
 
diff --git a/rollup/npmHelpers.js b/rollup/npmHelpers.js
index 0b79fb6edc03..be6a900b2115 100644
--- a/rollup/npmHelpers.js
+++ b/rollup/npmHelpers.js
@@ -13,6 +13,7 @@ import {
   makeCleanupPlugin,
   makeSucrasePlugin,
   makeDebugBuildStatementReplacePlugin,
+  makeSetSDKSourcePlugin,
 } from './plugins/index.js';
 import { mergePlugins } from './utils';
 
@@ -31,6 +32,7 @@ export function makeBaseNPMConfig(options = {}) {
   const debugBuildStatementReplacePlugin = makeDebugBuildStatementReplacePlugin();
   const cleanupPlugin = makeCleanupPlugin();
   const extractPolyfillsPlugin = makeExtractPolyfillsPlugin();
+  const setSdkSourcePlugin = makeSetSDKSourcePlugin('npm');
 
   const defaultBaseConfig = {
     input: entrypoints,
@@ -83,6 +85,7 @@ export function makeBaseNPMConfig(options = {}) {
 
     plugins: [
       nodeResolvePlugin,
+      setSdkSourcePlugin,
       sucrasePlugin,
       debugBuildStatementReplacePlugin,
       cleanupPlugin,
diff --git a/rollup/plugins/bundlePlugins.js b/rollup/plugins/bundlePlugins.js
index d6521e53a614..5e483dfddc46 100644
--- a/rollup/plugins/bundlePlugins.js
+++ b/rollup/plugins/bundlePlugins.js
@@ -63,6 +63,15 @@ export function makeIsDebugBuildPlugin(includeDebugging) {
   });
 }
 
+export function makeSetSDKSourcePlugin(sdkSource) {
+  return replace({
+    preventAssignment: false,
+    values: {
+      __SENTRY_SDK_SOURCE__: JSON.stringify(sdkSource),
+    },
+  });
+}
+
 /**
  * Create a plugin to set the value of the `__SENTRY_BROWSER_BUNDLE__` magic string.
  *