Ace 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.

Ace compared with assistant-ui
Detail	Ace	assistant-ui
What it does	Voice AI assistant that lives on your computer and phone to help with screen explanations, writing, notes and study tools	Open-source React components and runtimes for building AI chat
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	US
Pricing model	Freemium	Open source
Pricing	Free Play: 2,000 free credits with no card required. Pay as you go: $10 for 5,000 credits or $50 for 20,000 credits. Pocket Pair: $30/month for 10,000 credits monthly. Full House: $50/month for 30,000 credits monthly with $25 refill option for 10,000 credits. High Roller: $100/month for 60,000 credi	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	Screen understanding: explain visible questions and documents Writing assistance in apps you already use like Google Docs Cross-device synchronization: Mac, Windows, Linux, web and mobile Stealth mode for private work on your own machine Ace Mobile app for connecting iPhone to Mac	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	Voice-first interface: hold a key and speak naturally instead of typing Sees your screen when you ask: understands context from what's visible to help Works in apps you already use without switching context One account for computer, phone and web with shared credits	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)	50 +6 (up) since last check	53 +1 (up) since last check
Trust Flow (Majestic)	1	12
Citation Flow (Majestic)	42	39
Referring domains (Majestic)	49	572

6 details filled in for both companies.

More alternatives to Ace More alternatives to assistant-ui