Nitrosend 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.

Nitrosend compared with assistant-ui
Detail	Nitrosend	assistant-ui
What it does	AI-native email platform for Claude, ChatGPT and any agent	Open-source React components and runtimes for building AI chat
Stage	Startup	Not given
Founded	2025	Not given
Based in	US	US
Pricing model	Not given	Open source
Pricing	Free: $0 (8,000 emails then 500/month). Pro: $20/month (20,000 emails/month). Ultra: $100/month (125,000 emails/month). Enterprise: $300/month (500,000-4,000,000+ emails/month). Extra emails: $0.19 per 100 (Pro), $0.15 per 100 (Ultra). Dedicated IPs: $50/IP/month (Ultra and Enterprise).	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	Visual flow builder with event triggers and conditional splits AI-powered content generation with brand voice matching Multi-brand management with isolated sender reputation Unlimited contacts on all plans Dynamic segments and list management with CSV import SMS campaigns via Twilio integration Real-time analytics with AI-powered insights MCP, REST API, SDK, and CLI access on all plans Bring-your-own sending and AI infrastructure keys	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	Built by email industry veterans with 6 billion emails sent across previous companies AI agents operate email with human approval gates by default Integrated with open-source Email Marketing Bible skill with 908 sources MCP-first architecture with API, SDK and CLI options No per-contact pricing; unlimited contacts on every plan	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)	61 +4 (up) since last check	53 +1 (up) since last check
Trust Flow (Majestic)	10	12
Citation Flow (Majestic)	32	39
Referring domains (Majestic)	229	572

5 details filled in for both companies.

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