SparkGPT 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.

SparkGPT compared with assistant-ui
Detail	SparkGPT	assistant-ui
What it does	AI sales agent that turns website visitors into buyers	Open-source React components and runtimes for building AI chat
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Freemium	Open source
Pricing	Free Plan: $0 forever. Build and test one agent with unlimited testing, no credit card required. Growth Plan: $49/month plus 5% of attributed sales, with unlimited conversations and full ROI dashboard. Done For You: custom pricing.	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	Paste website URL and agent is built automatically from site content Claude-powered AI with intelligent model routing Product recommendation engine Sales attribution tracking with 24-hour window ROI dashboard showing every attributed sale Single line of code deployment Works with Shopify, WordPress, and custom sites Unlimited conversations on Growth plan Prepaid credit billing model Built for small and mid-sized online businesses	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	Outcome-based pricing tied to attributed sales, not conversation volume No credit card required to build and test for free forever No technical setup required; built from your existing website content Transparent ROI with every attributed sale visible and inspectable Built on Anthropic's Claude for stronger reasoning and sales capability	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)	42 −1 (down) since last check	53 +1 (up) since last check
Trust Flow (Majestic)	9	12
Citation Flow (Majestic)	19	39
Referring domains (Majestic)	28	572

5 details filled in for both companies.

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