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features
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support

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Description

21st is a development platform designed to help engineers quickly build and deploy AI agents inside their applications. The platform provides a specialized SDK that simplifies the process of defining agent behavior, integrating tools, and connecting AI models. Developers can create agents using familiar technologies such as Next.js, React, TypeScript, Python, and Node.js, making integration straightforward for modern applications. Once an agent is defined, the platform allows it to be deployed with a single command while automatically handling infrastructure requirements. 21st provides sandboxed execution environments through E2B sessions, ensuring that agent operations run securely and independently. The platform includes a ready-to-use chat interface component that can be embedded directly into an app for user interaction. Additional features include token streaming, conversation history, tool execution, and built-in observability for debugging and monitoring. Developers can replay sessions and trace tool calls to better understand how agents behave during execution. The system also supports spend limits, authentication controls, and rate limiting to manage AI usage across users. By combining development tools with managed infrastructure, 21st helps teams launch scalable AI agents without building complex backend systems.

Description

Semantic Kernel is an open-source development toolkit that facilitates the creation of AI agents and the integration of cutting-edge AI models into applications written in C#, Python, or Java. This efficient middleware accelerates the deployment of robust enterprise solutions. Companies like Microsoft and other Fortune 500 firms are taking advantage of Semantic Kernel's flexibility, modularity, and observability. With built-in security features such as telemetry support, hooks, and filters, developers can confidently provide responsible AI solutions at scale. The support for versions 1.0 and above across C#, Python, and Java ensures reliability and a commitment to maintaining non-breaking changes. Existing chat-based APIs can be effortlessly enhanced to include additional modalities such as voice and video, making the toolkit highly adaptable. Semantic Kernel is crafted to be future-proof, ensuring seamless integration with the latest AI models as technology evolves, thus maintaining its relevance in the rapidly changing landscape of artificial intelligence. This forward-thinking design empowers developers to innovate without fear of obsolescence.

API Access

Has API No 

API Access

Has API Yes 

Screenshots View All

Screenshots View All

Integrations

Azure App Service No 
C# No 
DeepSeek R1 No 
Dock No 
Java No 
Microsoft 365 Copilot No 
Openlayer No 
Prefactor No 
Python No 
React Yes 
Tailwind CSS Yes 
Weaviate No 
shadcn/ui Yes 

Integrations

Azure App Service Yes 
C# Yes 
DeepSeek R1 Yes 
Dock Yes 
Java Yes 
Microsoft 365 Copilot Yes 
Openlayer Yes 
Prefactor Yes 
Python Yes 
React No 
Tailwind CSS No 
Weaviate Yes 
shadcn/ui No 

Pricing Details

Free
Free Trial No 
Free Version Yes 

Pricing Details

Free
Free Trial No 
Free Version Yes 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours Yes 
Live Rep (24/7) Yes 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars Yes 
Live Training (Online) No 
In Person Yes 

Vendor Details

Company Name

21st.dev

Website

21st.dev/

Vendor Details

Company Name

Microsoft

Founded

1975

Country

United States

Website

learn.microsoft.com/en-us/semantic-kernel/overview/

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