Nastia AI vs Sol

Side-by-side comparison to help you pick the right tool. Both tested and ranked across 5 shared categories.

We earn commissions from some links

Nastia AI

★★★★☆3.7/5

Group chats with multiple AIs at once, and zero filters on any of them.

Best for: Unfiltered AI with group chat

★★★☆3.3/5

Goes deeper than your phone's other roleplay apps, and won't pretend otherwise.

Best for: Mobile AI character roleplay and companion chat

CategoryNastia AISol

Content Quality4/5 ●3.5/5

GOONability4/5 ●3.5/5

Ease of Use3/53/5

Overall3.73.3

Pros

+ Group chat lets up to 3 AI companions interact with each other and you simultaneously
+ Advanced personality traits like Lust, Pride, and Envy create unpredictable character behavior
+ Voice cloning produces custom audio that sounds distinct per companion
+ End-to-end encryption with discreet billing keeps everything private

Cons

- No pre-built character library, you build every companion from scratch
- Responses occasionally lose coherence during longer sessions, breaking immersion

Pros

+ Group chats run multiple characters in one room, closer to Character.AI's scene format than another single-thread companion, built for scenarios that would get shut down over there
+ Persona system lets you switch how you present without wiping what each Solmate remembers about you
+ Conversation memory persists across sessions so characters pick up where you left off instead of cold-starting every reopen
+ Openly built for adult roleplay from the store listing to the character library, no wholesome-companion veneer to see through

Cons

- Ads, coin packs, and subscriptions all stacked at once, with ad prompts that cut into scenes right when momentum builds
- Phone only, no browser version or desktop client, so anyone who prefers a real keyboard is stuck thumb-typing
- Rougher on some Android devices than apps with bigger install bases, input bugs and layout glitches still surface