21st

21st

21st.dev
21st Genstack

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21st:

About

21st is a developer platform that provides the fastest way to add AI agents directly into applications. The platform offers an SDK that allows developers to define, deploy, and run AI agents with minimal infrastructure setup. Developers can integrate agents using popular frameworks such as Next.js, React, TypeScript, Python, and Node.js. 21st includes built-in features like chat interfaces, session history, tool execution, memory, and real-time streaming responses. The platform also manages backend components such as sandboxed execution environments, authentication, rate limits, and observability. With support for Claude Code and Codex runtimes, developers can build agents that interact with tools, files, and APIs securely. By handling infrastructure and deployment automatically, 21st enables teams to launch production-ready AI agents quickly.
Genstack:

About

Genstack is a universal AI SDK and unified API platform designed to simplify how developers access and manage AI models. It eliminates the need to juggle multiple providers by offering a single API interface through which users can apply any available model, configure how they respond, experiment with alternatives, and fine-tune behavior. The platform handles underlying infrastructure like load balancing and prompt management so developers can focus on building. With transparent, usage-based pricing, ranging from pay-per-call in a free tier to cost-effective per-request rates in the Pro tier, Genstack aims to make AI integration straightforward and predictable, enabling developers to switch models, adjust prompts, and deploy with confidence.
21st:

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported
Genstack:

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported
21st:

Audience

Software developers, startups, and product teams that want a fast and scalable way to build and deploy AI agents inside their applications
Genstack:

Audience

Startups requiring a tool to manage multiple AI models and iterate quickly without infrastructure overhead
21st:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Genstack:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
21st:

API

Offers API Not Supported
Genstack:

API

Offers API Supported
21st:

Screenshots and Videos

Genstack:

Screenshots and Videos

21st:

Pricing

Free
Free Version Supported
Free Trial Not Supported
Genstack:

Pricing

$12 per month
Free Version Supported
Free Trial Not Supported
21st:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
Genstack:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
21st:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Genstack:

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported
21st:

Company Information

21st.dev
21st.dev/
Genstack:

Company Information

Genstack
United States
genstack.site/
21st:

Alternatives

Genstack:

Alternatives

21st:
Genstack:
21st:
Genstack:
Semantic Kernel

Semantic Kernel

Microsoft
21st:
Genstack:
21st:
Genstack:
LangChain

LangChain

5.0 out of 5 stars
21st:

Categories

AI SDKs Supported
UI Design Supported
Genstack:

Categories

AI Development Supported
AI SDKs Supported
21st:

Integrations

Gemini Not Supported
Gemini Enterprise Not Supported
Grok Bot Supported
OpenAI Not Supported
React Supported
Tailwind CSS Supported
shadcn/ui Supported
Genstack:

Integrations

Gemini Supported
Gemini Enterprise Supported
Grok Bot Not Supported
OpenAI Supported
React Not Supported
Tailwind CSS Not Supported
shadcn/ui Not Supported
21st:
Claim 21st and update features and information
Claim 21st and update features and information
Genstack:
Claim Genstack and update features and information
Claim Genstack and update features and information