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Rubii vs assistant-ui

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Rubii compared with assistant-ui
DetailRubii logo Rubiiassistant-ui logo assistant-ui
What it doesFree AI character chat, roleplay and interactive stories Open-source React components and runtimes for building AI chat
StageNot given Not given
FoundedNot given Not given
Based inNot given US
Pricing modelFreemium Open source
PricingFree 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). The core library is free and MIT licensed. assistant-cloud offers: Free ($0, 200 MAU included), Pro ($50/mo, 500 MAU included plus $0.10 per additional MAU), Enterprise (custom MAU pricing, contact for details).
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+
  • Streaming support for real-time chat output
  • Tool execution and integration
  • Thread persistence and history
  • Voice support
  • Generative UI rendering
  • Message attachments
  • Conversation branching
  • Multi-platform support (React, Vue, React Native, Ink)
  • Runtime adapter support (AI SDK, LangGraph, LangChain)
  • Fully customizable component composition
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
  • Works with any backend through pluggable runtime adapters
  • Complete source code available for customization via CLI
  • Production-ready runtime handling streaming, tools, and state
  • Free MIT license with optional paid cloud persistence
  • Cross-platform support with single chat model
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)39 +1 (up) since last check53 +1 (up) since last check
Trust Flow (Majestic)2712
Citation Flow (Majestic)3239
Referring domains (Majestic)293572

5 details filled in for both companies.

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