diff --git a/src/PosthogAnalytics.ts b/src/PosthogAnalytics.ts
index 93b84ff305..20c4ff2f33 100644
--- a/src/PosthogAnalytics.ts
+++ b/src/PosthogAnalytics.ts
@@ -136,6 +136,9 @@ export class PosthogAnalytics {
     private authenticationType: Signup["authenticationType"] = "Other";
     private watchSettingRef?: string;
 
+    // Will be set when the matrixClient is passed to the analytics object (e.g. on login).
+    private currentCryptoBackend?: "Rust" | "Legacy" = undefined;
+
     public static get instance(): PosthogAnalytics {
         if (!this._instance) {
             this._instance = new PosthogAnalytics(posthog);
@@ -170,6 +173,7 @@ export class PosthogAnalytics {
         SettingsStore.monitorSetting("layout", null);
         SettingsStore.monitorSetting("useCompactLayout", null);
         this.onLayoutUpdated();
+        this.updateCryptoSuperProperty();
     }
 
     private onLayoutUpdated = (): void => {
@@ -278,6 +282,8 @@ export class PosthogAnalytics {
             this.registerSuperProperties(this.platformSuperProperties);
         }
         this.anonymity = anonymity;
+        // update anyhow, no-op if not enabled or Disabled.
+        this.updateCryptoSuperProperty();
     }
 
     private static getRandomAnalyticsId(): string {
@@ -367,7 +373,28 @@ export class PosthogAnalytics {
         this.registerSuperProperties(this.platformSuperProperties);
     }
 
+    private updateCryptoSuperProperty(): void {
+        if (!this.enabled || this.anonymity === Anonymity.Disabled) return;
+        // Update super property for cryptoSDK in posthog.
+        // This property will be subsequently passed in every event.
+        if (this.currentCryptoBackend) {
+            this.registerSuperProperties({ cryptoSDK: this.currentCryptoBackend });
+        }
+    }
+
     public async updateAnonymityFromSettings(client: MatrixClient, pseudonymousOptIn: boolean): Promise<void> {
+        // Temporary until we have migration code to switch crypto sdk.
+        if (client.getCrypto()) {
+            const cryptoVersion = client.getCrypto()!.getVersion();
+            // version for rust is something like "Rust SDK 0.6.0 (9c6b550), Vodozemac 0.5.0"
+            // for legacy it will be 'Olm x.x.x"
+            if (cryptoVersion.includes("Rust SDK")) {
+                this.currentCryptoBackend = "Rust";
+            } else {
+                this.currentCryptoBackend = "Legacy";
+            }
+        }
+
         // Update this.anonymity based on the user's analytics opt-in settings
         const anonymity = pseudonymousOptIn ? Anonymity.Pseudonymous : Anonymity.Disabled;
         this.setAnonymity(anonymity);
@@ -379,7 +406,8 @@ export class PosthogAnalytics {
         }
 
         if (anonymity !== Anonymity.Disabled) {
-            await PosthogAnalytics.instance.updatePlatformSuperProperties();
+            await this.updatePlatformSuperProperties();
+            this.updateCryptoSuperProperty();
         }
     }
 
diff --git a/test/PosthogAnalytics-test.ts b/test/PosthogAnalytics-test.ts
index 1ba7c01d53..d73ee1ec66 100644
--- a/test/PosthogAnalytics-test.ts
+++ b/test/PosthogAnalytics-test.ts
@@ -16,6 +16,7 @@ limitations under the License.
 
 import { mocked } from "jest-mock";
 import { PostHog } from "posthog-js";
+import { CryptoApi, MatrixClient } from "matrix-js-sdk/src/matrix";
 
 import { Anonymity, getRedactedCurrentLocation, IPosthogEvent, PosthogAnalytics } from "../src/PosthogAnalytics";
 import SdkConfig from "../src/SdkConfig";
@@ -37,6 +38,7 @@ const getFakePosthog = (): PostHog =>
         persistence: {
             get_user_state: jest.fn(),
         },
+        identifyUser: jest.fn(),
     } as unknown as PostHog);
 
 interface ITestEvent extends IPosthogEvent {
@@ -274,4 +276,78 @@ describe("PosthogAnalytics", () => {
             });
         });
     });
+
+    describe("CryptoSdk", () => {
+        let analytics: PosthogAnalytics;
+        const getFakeClient = (): MatrixClient =>
+            ({
+                getCrypto: jest.fn(),
+                setAccountData: jest.fn(),
+                // just fake return an `im.vector.analytics` content
+                getAccountDataFromServer: jest.fn().mockReturnValue({
+                    id: "0000000",
+                    pseudonymousAnalyticsOptIn: true,
+                }),
+            } as unknown as MatrixClient);
+
+        beforeEach(async () => {
+            SdkConfig.put({
+                brand: "Testing",
+                posthog: {
+                    project_api_key: "foo",
+                    api_host: "bar",
+                },
+            });
+
+            analytics = new PosthogAnalytics(fakePosthog);
+        });
+
+        // `updateAnonymityFromSettings` is called On page load / login / account data change.
+        // We manually call it so we can test the behaviour.
+        async function simulateLogin(rustBackend: boolean, pseudonymous = true) {
+            // To simulate a switch we call updateAnonymityFromSettings.
+            // As per documentation this function is called On login.
+            const mockClient = getFakeClient();
+            mocked(mockClient.getCrypto).mockReturnValue({
+                getVersion: () => {
+                    return rustBackend ? "Rust SDK 0.6.0 (9c6b550), Vodozemac 0.5.0" : "Olm 3.2.0";
+                },
+            } as unknown as CryptoApi);
+            await analytics.updateAnonymityFromSettings(mockClient, pseudonymous);
+        }
+
+        it("should send rust cryptoSDK superProperty correctly", async () => {
+            analytics.setAnonymity(Anonymity.Pseudonymous);
+
+            await simulateLogin(false);
+
+            expect(mocked(fakePosthog).register.mock.lastCall![0]["cryptoSDK"]).toStrictEqual("Legacy");
+        });
+
+        it("should send Legacy cryptoSDK superProperty correctly", async () => {
+            analytics.setAnonymity(Anonymity.Pseudonymous);
+
+            await simulateLogin(false);
+
+            // Super Properties are properties associated with events that are set once and then sent with every capture call.
+            // They are set using posthog.register
+            expect(mocked(fakePosthog).register.mock.lastCall![0]["cryptoSDK"]).toStrictEqual("Legacy");
+        });
+
+        it("should send cryptoSDK superProperty when enabling analytics", async () => {
+            analytics.setAnonymity(Anonymity.Disabled);
+
+            await simulateLogin(true, false);
+
+            // This initial call is due to the call to register platformSuperProperties
+            // The important thing is that the cryptoSDK superProperty is not set.
+            expect(mocked(fakePosthog).register.mock.lastCall![0]).toStrictEqual({});
+
+            // switching to pseudonymous should ensure that the cryptoSDK superProperty is set correctly
+            analytics.setAnonymity(Anonymity.Pseudonymous);
+            // Super Properties are properties associated with events that are set once and then sent with every capture call.
+            // They are set using posthog.register
+            expect(mocked(fakePosthog).register.mock.lastCall![0]["cryptoSDK"]).toStrictEqual("Rust");
+        });
+    });
 });