# 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()

A function that sets user attributes for use in paywalls and analytics on the Superwall dashboard.

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

> **Info:** Keys beginning with `$` are reserved for Superwall internal use and will be ignored. Arrays and nested maps are not supported as values.

## Purpose

Sets custom user attributes that can be used in paywall personalization, audience filters, and analytics on the Superwall dashboard.

## Signature

```kotlin
fun Superwall.setUserAttributes(attributes: Map<String, Any?>)
```

```java
// Java
public void setUserAttributes(Map<String, Object> attributes)
```

## Parameters

<TypeTable
  type="{
  attributes: {
    type: &#x22;Map<String, Any?>&#x22;,
    description: &#x22;A map of custom attributes to store for the user. Values can be any JSON encodable value, including strings, numbers, booleans, URLs, or timestamps.&#x22;,
    required: true,
  },
}"
/>

## Returns / State

This function returns `Unit`. If an attribute already exists, its value will be overwritten while other attributes remain unchanged.

## Usage

Set multiple user attributes:

```kotlin
val attributes = mapOf(
    "name" to "John Doe",
    "email" to "john@example.com",
    "plan" to "premium",
    "signUpDate" to System.currentTimeMillis(),
    "profilePicUrl" to "https://example.com/pic.jpg",
    "isVip" to true,
    "loginCount" to 42
)

Superwall.instance.setUserAttributes(attributes)
```

Set individual attributes over time:

```kotlin
Superwall.instance.setUserAttributes(mapOf("lastActiveDate" to System.currentTimeMillis()))
Superwall.instance.setUserAttributes(mapOf("featureUsageCount" to 15))
```

Remove an attribute by setting it to null:

```kotlin
Superwall.instance.setUserAttributes(mapOf("temporaryFlag" to null))
```

Real-world example after user updates profile:

```kotlin
fun updateUserProfile(user: User) {
    Superwall.instance.setUserAttributes(mapOf(
        "name" to user.displayName,
        "avatar" to user.avatarURL,
        "preferences" to user.notificationPreferences,
        "lastUpdated" to System.currentTimeMillis()
    ))
}
```

Java usage:

```java
// Set multiple attributes
Map<String, Object> attributes = new HashMap<>();
attributes.put("name", "John Doe");
attributes.put("email", "john@example.com");
attributes.put("plan", "premium");
attributes.put("loginCount", 42);

Superwall.getInstance().setUserAttributes(attributes);
```