Free AI character chat, roleplay and interactive stories
Your personal AI teacher for Physics, Chemistry & Maths doubts
Stage
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Founded
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Based in
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IN
Pricing model
Freemium
Freemium
Pricing
Free plan available. Plus: $7.99/month (800 Rubies, about 1,600 messages and 400 images). Pro: $14.99/month (3,000 Rubies, about 6,000 messages and 1,500 images). Premium: $29.99/month (6,600 Rubies, about 13,000 messages and 3,300 images).
Starter ₹199, Pro ₹499, Annual ₹2999
Key features
Long character memory that persists across conversations
Character creation with detailed settings
Browse community-created characters
Cross-platform access on web and mobile
Memory editing and boost features with Rubii+
Photo or text doubt upload
AI step-by-step whiteboard video
Physics Chemistry Maths diagrams
Follow-up question asking on each step
Quick self-assessment checks
Mistake Doctor for marking student solutions
Interactive lab with 30+ simulations
Doubt Diary organized by topic
Chapter-wise practice questions
Multi-language support including Hinglish and Hindi
What makes it different
Long-form story-driven chat built for novel-length conversations, not one-line replies
Persistent character memory that recalls details across weeks of chats
Complete creator toolkit combining character design, image generation and video in one workflow
Multiple AI model options for different writing styles
Active community where creators can share and earn
Narrated whiteboard videos drawn directly on the student's question figure
Mistake Doctor identifies exactly where solutions go wrong and explains the fix
Interactive simulations for hands-on learning with real formulas
Bilingual voice narration in Hinglish and English across 9 languages
Doubt Diary tracks weak chapters by topic for revision
Rubii
Doubtclip