FastBots 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.

FastBots compared with assistant-ui
Detail	FastBots	assistant-ui
What it does	AI chatbot platform for websites trained on your business data	Open-source React components and runtimes for building AI chat
Stage	Not given	Not given
Founded	2022	Not given
Based in	GB	US
Pricing model	Free trial	Open source
Pricing	Essential $33/month (or $39 billed monthly): 2 chatbots, 2,000 message credits/month, 2,500 crawl pages. Business $75/month (or $89 billed monthly): 5 chatbots, 5,000 message credits/month, 5,000 crawl pages. Premium $165/month (or $199 billed monthly): 10 chatbots, 10,000 message credits/month, 7,5	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	Multi-channel deployment across websites, WhatsApp, Instagram, Facebook Messenger, Telegram, Slack, and email Upload documents, PDFs, CSV files, and websites for training data Choice of AI models from OpenAI, Anthropic, and Google Live chat with human handover and seamless conversation transfer Automated translations supporting around 95 languages Automatic retraining to keep chatbot knowledge up-to-date Chat history and conversation logging for all chatbot interactions Bot personas and customizable prompts to change bot character and purpose Military-grade encryption for uploaded data security	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	No-code platform requiring no technical expertise, allowing anyone to build AI chatbots in minutes Multi-channel deployment enabling single chatbot to work across websites and messaging platforms Seamless handover to human agents when chatbot encounters questions outside its knowledge Automated lead capture and collection from conversations with export capabilities	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)	62 +1 (up) since last check	53 +1 (up) since last check
Trust Flow (Majestic)	21	12
Citation Flow (Majestic)	33	39
Referring domains (Majestic)	1123	572

6 details filled in for both companies.

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