> ## Documentation Index
> Fetch the complete documentation index at: https://docs.linkrunner.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Privacy Tier Breakdown

> Understand how Apple assigns privacy tiers and what data you receive at each tier level

## What is Crowd Anonymity?

To protect user privacy, Apple limits the data in SKAdNetwork postbacks based on **crowd anonymity**. The idea is simple: the more installs a campaign generates, the harder it is to identify any individual user, so Apple shares more data.

Apple assigns each app download a **postback data tier** (0-3). Higher tiers = more data.

## How Apple Determines Your Privacy Tier

Apple calculates your tier based on:

* **Crowd size** of the app/domain displaying the ad
* **Crowd size** of the advertised app
* **Country** where the app was installed
* **Hierarchical source identifier** provided by the ad network

## What Data You Receive at Each Tier

| Field                                 | Tier 0   | Tier 1   | Tier 2   | Tier 3                      |
| ------------------------------------- | -------- | -------- | -------- | --------------------------- |
| **source-identifier**                 | 2 digits | 2 digits | 3 digits | 4 digits                    |
| **conversion-value** (fine)           | ❌        | ❌        | ✅        | ✅                           |
| **coarse-conversion-value**           | ❌        | ✅        | ✅        | ✅                           |
| **source-app-id** / **source-domain** | ❌        | ❌        | ❌        | ✅                           |
| **country-code**                      | ❌        | ❌        | ❌        | ✅ (if crowd size qualifies) |

### Tier 3 (Best Data)

* Full 4-digit source identifier
* Fine-grained conversion value (0-63) in first postback
* Coarse conversion value in all postbacks
* Source app ID or source domain
* Country code (if crowd size qualifies)

### Tier 2

* 3-digit source identifier
* Fine-grained conversion value (0-63) in first postback
* Coarse conversion value in all postbacks

### Tier 1

* 2-digit source identifier
* Coarse conversion value only (Low/Medium/High)
* No fine-grained conversion value

### Tier 0 (Minimal Data)

* 2-digit source identifier
* No conversion value data
* Only confirms an install happened

## Related

* [Stats Overview Cards](/features/skan-dashboard/stats-cards)
* [Conversion Value Distribution](/features/skan-dashboard/conversion-values)
* [Install Trends Over Time](/features/skan-dashboard/trend-graph)