Sdk

21st Agents SDK

21st Agents SDK is the fastest way to add an AI agent to your app. Define your agent in TypeScript, deploy in one command, and embed a production-ready chat UI with Built-in streaming, session management, usage billing, and observability — so you can focus on what makes your agent unique, not infrastructure. Backed by Y Combinator (W26).

Infrastructure platform for CLI-based AI agents
Sandboxing for secure agent execution
Credentials management

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NexaSDK for Mobile

NexaSDK for Mobile lets developers use the latest multimodal AI models fully on-device on iOS & Android apps with Apple Neural Engine and Snapdragon NPU acceleration. In just 3 lines of code, build chat, multimodal, search, and audio features with no cloud cost, complete privacy, 2x faster speed and 9× better energy efficiency.

Deploy LLMs, multimodal, ASR & TTS models on multiple device types
Fast and private AI inference engine
Production-ready on NPU, GPU, and CPU

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Code Mode

LLMs are great at writing code but struggle with writing tool calls. Code Mode solves this by giving your model ONE powerful tool: a TypeScript execution sandbox with access to your entire toolkit. Complex, multi-step workflows thereby become a single batched execution. Independent studies show massive gains: 60% faster execution, 68% fewer tokens, 88% fewer round-trips, while Anthropic's research team found a massive reduction of 98.7% in token usage using CodeMode.

Daily discovery of new products
Community-driven product discussions
Platform for startups to launch and gain exposure

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Business & Marketing

Apps in ChatGPT

Apps are now in ChatGPT. Chat directly with interactive apps from Spotify, Canva, Zillow, and more, right in your conversation. Built on the new open Apps SDK, it’s a new generation of apps that turns ChatGPT into the next major app platform.

No features available

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Tokyo

Advanced AI toolkit for tracking and analyzing user interactions across multiple clients. Streamline your AI operations with our comprehensive monitoring solution.

No features available

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Inworld Runtime

The first AI-native backend engineered to power massive-scale consumer applications. Easily scale from prototype to millions. Automated MLOps frees you from maintenance. Deploy no-code experiments instantly. Battle-tested through work with NVIDIA, Google, Xbox

No features available

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Liveblocks 3.0

Liveblocks gives you ready-made features like AI Copilots, Comments, and Multiplayer Editing to make your product more engaging and grow your business.

Real-time news and trend updates
Short message sharing
Engagement through conversations

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Conversational AI & Chatbots

Cloudflare Agents

Cloudflare Agents is the platform for building scalable, stateful AI agents. Leverages Durable Objects for state, Workers for compute, plus real-time comms.

Remember conversations
Act on schedules
Call tools

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cognee

cognee is an open-source semantic memory layer for AI agents, built on vector and graph databases. It constructs knowledge graphs from retrieved data, enabling AI apps and agents to deliver accurate, context-aware responses.

Open source AI memory engine
Find hidden connections in data
Improve AI infrastructure

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Amazon Nova Act

Amazon Nova Act is an AI model enabling agents to control browsers reliably. Build automations via the SDK using atomic commands, Python, & APIs.

No features available

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Graphiti

Graphiti is Knowledge Graph-based memory for AI agents. Automatically build rich graphs from changing business data & chat histories. Enable your Python agent with fast access to relevant, accurate data, even as it evolves over time. Visit our GitHub repo!

Build AI agents that interact with APIs
Execute multi-step workflows autonomously
Open-source framework

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Needle

Connect your private data sources like Google Drive, Gmail, Confluence, Notion to Needle's Knowledge Threading™ platform and get instant answers to all your questions. Plus, use Needle's API to build context-aware AI agents. Available in MCP, DSPy, Vercel.

AI-powered automation
Information discovery across multiple data sources
RAG API for building agentic AI applications

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Overseer AI

Overseer AI - Lightweight, dev-first AI safety API that monitors and validates AI system outputs across all models and providers. Features real-time content analysis, custom safety policies, usage analytics, and an open-source API with language-specific SDKs.

AI safety API
Custom model training
Professional services for AI compliance

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Conversational AI & Chatbots

Video SDK 3.0

CharacterSDK allows developers to create multimodal AI characters, capable of real-time interactions and contextual understanding. Seamlessly integrate these intelligent companions into existing workflows to provide personalized user experience.

Create lifelike AI characters with voice and video
Real-time animation for virtual avatars
Perfect for games, training, and virtual experiences

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Conva.AI

Conva.AI is the world’s first AI Assistant as a Service platform. It empowers companies to effortlessly create, integrate, and monitor AI Assistants within their apps. No need for deep AI expertise—just focus on building great experiences. 💼

AI-powered conversational assistant
Natural language processing
Personalized responses

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Conversational AI & Chatbots

Storybot AI

Tell Storybot your idea for a story using your voice, sit back, and hear a magical story unfurl in real-time. Storybot loves to craft stories with you, so get ready to choose-your-own-adventure!

No features available

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