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.
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