Free AI character chat, roleplay and interactive stories
AI math tutor for K–12 schools and districts using guided questioning to help students solve problems
Stage
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Founded
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Based in
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US
Pricing model
Freemium
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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).
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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+
Guided questioning feedback that builds thinking instead of revealing answers
Handwritten work recognition and assessment
Support for geometry drawings, tables and graphs
Real-time data on student progress and learning gaps
Content aligned with state standards and curriculum
Three difficulty levels for differentiated learning
Support for 200+ languages
Adaptive practice personalized to student skill level
Multiple assignment types including entry, exit and formative assessments
Spiral review of previously learned topics
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
AI tutoring that uses hints to build thinking rather than revealing answers
Assesses step-by-step work including handwritten submissions, not just final answers
Trusted by 3000+ schools and districts
Real-time actionable data for teachers to differentiate and target support
Rubii
Smartschool