Hashbrown vs Thesys
Updated onCompare Hashbrown and Thesys side-by-side. See how they stack up on features, pricing, and target market.
Hashbrown
An open-source TypeScript framework for building generative user interfaces powered by large language models.
Starts at $0
vs
Thesys
Thesys is a San Francisco–based startup that provides C1, a Generative UI API and React SDK which converts LLM responses into live, interactive user interfaces for developers and teams.
Starts at $0
Has a free trial
Which should you choose?
Hashbrown
Choose Hashbrown if you want an open-source, self-hosted TypeScript framework for React/Angular that gives you fine-grained control over Generative UI while paying only your underlying LLM providers.
Thesys
Choose Thesys if you want a managed Generative UI API and React SDK you can drop into existing AI apps quickly, with free and paid usage-based plans plus enterprise-grade security and support.
Typical cost comparison
Scenario: Small team moving a single AI-powered web app into production with moderate Generative UI usage, billed monthly.
Hashbrown
$0 per month
Thesys
$49 per month
Hashbrown saves you $49 per month in this scenario.
Key differences
| Category | Hashbrown | Thesys | Why? |
|---|---|---|---|
| Feature Set & Ecosystem | Both focus on Generative UI and streaming, with Hashbrown emphasizing developer-centric capabilities like the Skillet schema language, a browser-side JS runtime, multi-vendor LLM support, and MCP integration, while Thesys emphasizes production SaaS features such as robust error handling, theming, prebuilt interactive components, and an Artifacts API for generating slides and reports, giving neither a clear overall edge. | ||
| Architecture & Control | Hashbrown is an open-source TypeScript framework you embed directly into React/Angular frontends and connect to your own LLM providers, while Thesys is a hosted C1 API plus React SDK sitting between your app and multiple LLMs, so Hashbrown offers more architectural control at the cost of more infrastructure responsibility. | ||
| Ease of Adoption | Thesys is generally faster to adopt because its C1 endpoint is OpenAI-compatible and can often be introduced by changing the base URL and swapping a markdown renderer for its React component, whereas Hashbrown requires learning its primitives and integrating new hooks or Angular constructs directly into your codebase, giving Thesys an edge in time-to-first-value. | ||
| Pricing | Hashbrown is MIT-licensed and free to use, whereas Thesys offers a free tier but its primary paid Build plan starts at $49/month for 25K C1 API calls with overages and separate LLM token billing, so Hashbrown wins on direct platform cost. | ||
| Security, Compliance & Enterprise Support | Hashbrown is an open-source library you run within your own stack without bundled SLAs, while Thesys provides enterprise-oriented plans with documented security and compliance commitments, optional VPC or self-hosting, and formal support SLAs, making Thesys stronger for regulated or large-enterprise deployments. |
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