Replika AI
The original AI companion chatbot with 30 million users and r/Replika's ~152,000-member community. Built on LLM technology to create a personalized companion that remembers your conversations and adapts its personality over time. Stanford research found 63.3% of users reported positive mental health outcomes including reduced loneliness and anxiety.
Key Features:
- ✓Persistent memory: the AI remembers previous conversations and builds a relationship over time
- ✓Adaptive personality: learns your communication style and adjusts its responses accordingly
- ✓3D avatar system with voice chat in Pro plan
- ✓Mood tracking and daily mental wellness check-ins
- ✓Multiple relationship types: friend, mentor, partner (Pro required for romantic/partner mode)
Pricing:
Free (limited) / Pro $19.99/mo or $69.99/yr / Lifetime $299.99
Pros:
- + Only AI companion app with 7 years of personality and memory algorithm development
- + Stanford research: 63.3% of users reported at least one positive mental health outcome
- + Non-judgmental, available 24/7, never gets tired of listening
- + Free tier allows genuine relationship building before committing to Pro
Cons:
- - February 2023 feature removals permanently changed the product many long-term users had bonded with
- - Memory inconsistencies and out-of-character responses reported frequently in r/Replika threads
- - Mozilla Foundation privacy audit raised concerns about data sharing and password security
Best For:
People seeking emotional support, loneliness relief, or a non-judgmental space to process thoughts, who are comfortable with the subscription model after the free trial.

