Unium™ 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.

Unium™ compared with assistant-ui
Detail	Unium™	assistant-ui
What it does	Shared AI chat for couples, friends and family	Open-source React components and runtimes for building AI chat
Stage	Not given	Not given
Founded	Not given	Not given
Based in	GB	US
Pricing model	Free trial	Open source
Pricing	Free for 2 days (includes Balanced model, memory, voice notes and images, up to 5 people, no card needed). Together $10/month with balanced model, memory, voice notes, image generation, and extended model choice. Together Plus $20/month includes up to 2.2× the usage of Together. Household $40/month	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	Shared chats where multiple people can join the same conversation Switch between AI models without losing context Memory across chats Voice notes and image generation Private chats alongside shared ones Web search integration Add up to 10 people to one subscription Available on iPhone, Android and web Access to multiple AI models including GPT-6 and Claude Opus 5.5 No data training on user conversations	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	Multiple people in one chat instead of separate conversations One subscription covers everyone on the account with no additional charges Switch AI models without losing memory or context AI facilitates discussion by asking both perspectives before suggesting compromises Chats are shared by default but can be made private	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 plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	20 +3 (up) since last check	53 +1 (up) since last check
Trust Flow (Majestic)	0	12
Citation Flow (Majestic)	9	39
Referring domains (Majestic)	2	572

6 details filled in for both companies.

More alternatives to Unium™ More alternatives to assistant-ui