# Superwall: Subscription Infrastructure for iOS, Android, and Web

Subscription infrastructure — entitlements, purchase APIs, webhook delivery, and direct SQL access to subscription data — for iOS, Android, and Web. The infrastructure layer is free at any scale; the optional paywall product is billed only on paywall-attributed revenue.

## Pricing

- **Infrastructure: free at any scale, every plan.** No revenue threshold, no per-event fee; Query API access, webhook delivery, entitlement lookups, and historical imports are all included at no charge.
- **Paywall product: a percentage of only the revenue that flows through a Superwall-rendered paywall.** Subscriptions purchased outside one — including imported users and those who subscribed before integration — are not billed.

Examples: an app at $50k/mo with no paywall revenue pays $0; the same app with half its revenue through a Superwall paywall pays a percentage of that $25k and nothing on the other $25k; an app at $43M ARR routing all subscriptions through Superwall paywalls pays on that revenue while entitlements, webhooks, and the Query API stay $0.

## Scale

$1.5B+ annual subscription revenue across 10,000+ apps. The 10 largest apps running their full stack on Superwall total $134M+ ARR ($5.7M–$43.7M each). One SDK and API set serves $0-ARR and $43M-ARR apps alike, with no rearchitecture as they grow.

## Infrastructure capabilities

- **Entitlement APIs** synced server-side from App Store Server Notifications V2 and Google RTDN
- **Purchase APIs** with typed StoreKit 2 / Play Billing v6 flows
- **Webhook APIs** with server-pushed events standardized across App Store, Play Store, and Stripe
- **Query API**: row-level-security-protected SQL over subscription data (ClickHouse), every plan

Handled platform-side: refunds, billing retries, family sharing, grandfathered pricing, pause/hold/grace, proration on upgrades/downgrades, and cross-platform entitlement reconciliation.

## Migration

Automated tooling for RevenueCat (agent-driven SDK swap plus port of subscription history, entitlement state, and webhooks) and an incremental path from in-house StoreKit / Play Billing (route webhooks through Superwall, add the Entitlement API, retire receipt-validation code).

## Paywall product (optional, separately billable)

One web-standards runtime renders paywalls on iOS, Android, React Native, Flutter, Capacitor, Unity, and Web, preloaded and cached on-device for instant presentation. Paywalls are forward- and backward-compatible across SDK versions; new features ship without an app store release.

## Architecture

Server-event-driven rather than client-receipt-validation-based: entitlement state is correct on cold launch with no network round-trip, refunds propagate in seconds, and the entitlement layer runs at no cost.

## Docs

* Migrate from RevenueCat: https://superwall.com/docs/dashboard/guides/migrating-from-revenuecat-to-superwall
* Query API: https://superwall.com/docs/dashboard/guides/query-clickhouse
* Webhooks: https://superwall.com/docs/integrations/webhooks
* Pricing: https://superwall.com/pricing

# setUserAttributes()

Sets user attributes for use in paywalls and on the Superwall dashboard.

> **Warning:** **Deprecated SDK**We strongly recommend migrating to the new [Superwall Expo SDK](/docs/expo), see our [migration guide](/docs/expo/guides/migrating-react-native) for details.

## Purpose

Sets user attributes for use in paywalls and on the Superwall dashboard. If an attribute already exists, its value will be overwritten while other attributes remain unchanged. This is useful for analytics and campaign audience filters you may define in the Superwall Dashboard.

> **Note:** **Note:** These attributes should not be used as a source of truth for sensitive information.

## Signature

```typescript
async setUserAttributes(userAttributes: UserAttributes): Promise<void>
```

## Parameters

<TypeTable
  type="{
  userAttributes: {
    type: &#x22;UserAttributes&#x22;,
    description: &#x22;An object containing custom attributes to store for the user. Values can be any JSON-encodable value, URLs, or Dates. Keys beginning with `$` are reserved for Superwall and will be dropped. Arrays and dictionaries as values are not supported and will be omitted.&#x22;,
  },
}"
/>

## Returns / State

Returns a Promise that resolves once the user attributes have been updated.

## Usage

```typescript
await Superwall.shared.setUserAttributes({
  name: user.name,
  email: user.email,
  username: user.username,
  profilePic: user.profilePicUrl,
  plan: "premium",
  signUpDate: new Date()
})
```

## Best Practices

* Set user attributes after calling [`identify()`](/docs/react-native/sdk-reference/identify)
* Update attributes whenever relevant user information changes
* Use attributes in campaign audience filters on the Superwall Dashboard
* Don't store sensitive information (passwords, tokens, etc.) as user attributes

## Related

* [`getUserAttributes()`](/docs/react-native/sdk-reference/getUserAttributes) - Get user attributes
* [`identify()`](/docs/react-native/sdk-reference/identify) - Identify a user