# Base

**URL:** https://heroiclabs.com/docs/hiro/dart/base/
**Keywords:** base, hiro
**Categories:** hiro, dart, base

---


# Base

Read more about the Base system in Hiro [here](../../concepts/base/).

## Rate app
Send feedback to the game's developers over email.

```dart
var request = RateAppRequest.new()
request.score = 9
request.message = "It's a great game, love it!"

await hiro.baseRateApp(session!, request)
```

## Set device prefs

Update or create the mobile push device tokens and preferences for the player.

```dart
var request = DevicePrefsRequest.new();
request.device_id = "device_id";
request.push_token_android = "android_push_token";
request.push_token_ios = "ios_push_token";
request.preferences = {
  "dark_mode": true
};

await hiro.baseSetDevicePrefs(session!, request);
```