Update readme.md

tools/readme.md

@@ -9,7 +9,7 @@ Interactive way to learn the Stellar API. The source is available [here](https:/
 
 # Reference applications and sample code
 
-## [Account Viewer](https://github.com/stellar/account-viewer)
+## [Account Viewer](https://www.stellar.org/account-viewer)
 Check your balance and send simple payments. This basic client is built on top of [Interstellar](https://github.com/stellar/interstellar) and connects to the live Stellar network. The source is available [here](https://github.com/stellar/account-viewer).
 
 ## [SMS Client](https://github.com/stellar/stellar-sms-client)