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Chai-app versus Nastia
Compare	Chai-app	Nastia
Verdict	Depends	Depends
Best for	Adults who want unfiltered AI companionship	Adults wanting uncensored NSFW roleplay
Who it's not for	Anyone under 18	Any business or team use
Privacy	18+ consumer app with a documented harm case, a past store removal, and no security page on its site.^⁵	No known public vulnerabilities found in the sources reviewed; returned no page and encryption claims are unverified marketing.¹⁴
Support quality	Users file bugs through GitHub, not support	No support evidence in sources
Public sentiment	Users split sharply: some rate it above Character AI, others slam the pricing and report decline.	Independent user feedback is scarce in reviewed sources; the main praise is a homepage testimonial about unexpectedly thoughtful conversations.¹³
Biggest gotcha	Premium and Ultra subscription pricing draws loud user complaints. Check cost before you subscribe.^³	No security page; cannot verify data retention or deletion for very intimate conversations.¹⁴

Pick Chai-app when

Adults who want unfiltered AI companionship
Casual mobile chatters
Hobbyist bot builders

When Chai-app is not a fit

Anyone under 18
Businesses or teams; it is a consumer chat app
Users who need private or protected chats
Buyers who want documented security and real support

Pick Nastia when

Adults wanting uncensored NSFW roleplay
Free-tier tasters of AI companions
Custom character enthusiasts
Solo private personal use

When Nastia is not a fit

Any business or team use
Minors; parents should block access
Buyers needing verified privacy or audits
Productivity or work-assistant seekers

Sources

Chai AI Review 2026: We Scored It 6.5/10kirdaarai.com
review
Chai is better than Character AI : r/ChaiAppreddit.com
review
CHAI's premium/ultra pricing are widely insanereddit.com
review
Why Was Chai AI Removed From the App Store and Play Storeheyreal.ai
news
Real-world AI incidents, vulnerabilities & research casesriskatlas.principle.sg
security
Safety Center - CHAIchai-research.com
official
CHAI AI Social Platform Hits 10M Usershrtechedge.com
news
CHAI AI Raises Over $55M to Lead User-Generated AItechintelpro.com
news
CHAI AI social LLM beats rivals in mobile engagementprnewswire.com
official
Chai User Feedback issue: roleplay stoppinggithub.com
review
Chai AI app removed from stores due to security concernsfacebook.com
news
Security pagechai-app.ai
official
Nastia | Your Caring Uncensored AI Companion (official)nastia.ai
official
Nastia Security page (not found)nastia.ai
security
Nastia AI: Honest Review of the Uncensored AI Companionainastia.org
review
Nastia AI uncensored app reviewtreva.es
review