Duolingo: Language Lessons collects contacts, other in-app messages, purchase history, and shares some of this with third parties.
Contacts
App functionality, Personalization
Other in-app messages
App functionality
Purchase history
App functionality, Analytics, Fraud prevention, security, and compliance, Personalization, Account management
Voice or sound recordings
App functionality, Analytics
Diagnostics
Analytics, Fraud prevention, security, and compliance
Other app performance data
Analytics
Device or other IDs
App functionality, Analytics, Advertising or marketing, Fraud prevention, security, and compliance
App interactions
App functionality, Analytics, Advertising or marketing, Fraud prevention, security, and compliance
Other user-generated content
App functionality, Personalization
Other actions
App functionality, Analytics
Name
Personalization, Account management
Email address
App functionality, Developer communications, Advertising or marketing, Account management
User IDs
App functionality, Analytics, Advertising or marketing, Account management
Phone number
App functionality, Developer communications, Advertising or marketing, Account management
Other info
App functionality, Fraud prevention, security, and compliance, Personalization, Account management
Diagnostics
Fraud prevention, security, and compliance
Other app performance data
Analytics
Device or other IDs
Analytics, Advertising or marketing, Fraud prevention, security, and compliance
App interactions
App functionality, Analytics, Advertising or marketing, Fraud prevention, security, and compliance
Other user-generated content
App functionality
Other actions
App functionality, Analytics