OpenAI Agents SDK vs. 21st

StackAI is an enterprise AI automation platform built to help organizations create end-to-end internal tools and processes with AI agents. Unlike point solutions or one-off chatbots, StackAI provides a single platform where enterprises can design, deploy, and govern AI workflows in a secure, compliant, and fully controlled environment. Using its visual workflow builder, teams can map entire processes — from data intake and enrichment to decision-making, reporting, and audit trails. Enterprise knowledge bases such as SharePoint, Confluence, Notion, Google Drive, and internal databases can be connected directly, with features for version control, citations, and permissioning to keep information reliable and protected. AI agents can be deployed in multiple ways: as a chat assistant embedded in daily workflows, an advanced form for structured document-heavy tasks, or an API endpoint connected into existing tools. StackAI integrates natively with Slack, Teams, Salesforce, HubSpot, ServiceNow, Airtable, and more. Security and compliance are embedded at every layer. The platform supports SSO (Okta, Azure AD, Google), role-based access control, audit logs, data residency, and PII masking. Enterprises can monitor usage, apply cost controls, and test workflows with guardrails and evaluations before production. StackAI also offers flexible model routing, enabling teams to choose between OpenAI, Anthropic, Google, or local LLMs, with advanced settings to fine-tune parameters and ensure consistent, accurate outputs. A growing template library speeds deployment with pre-built solutions for Contract Analysis, Support Desk Automation, RFP Response, Investment Memo Generation, and InfoSec Questionnaires. By replacing fragmented processes with secure, AI-driven workflows, StackAI helps enterprises cut manual work, accelerate decision-making, and empower non-technical teams to build automation that scales across the organization.

Gemini Enterprise Agent Platform is an advanced AI infrastructure from Google Cloud that enables organizations to build and manage intelligent agents at scale. As the evolution of Vertex AI, it consolidates model development, agent creation, and deployment into a unified platform. The system provides access to a diverse library of over 200 AI models, including cutting-edge Gemini models and leading third-party solutions. It supports both low-code and full-code development, giving teams flexibility in how they design and deploy agents. With capabilities like Agent Runtime, organizations can run high-performance agents that handle long-duration tasks and complex workflows. The Memory Bank feature allows agents to retain long-term context, improving personalization and decision-making. Security is a core focus, with tools like Agent Identity, Registry, and Gateway ensuring compliance, traceability, and controlled access. The platform also integrates seamlessly with enterprise systems, enabling agents to connect with data sources, applications, and operational tools. Real-time monitoring and observability features provide visibility into agent reasoning and execution. Simulation and evaluation tools allow teams to test and refine agents before and after deployment. Automated optimization further enhances agent performance by identifying issues and suggesting improvements. The platform supports multi-agent orchestration, enabling agents to collaborate and complete complex tasks efficiently. Overall, it transforms AI from a productivity tool into a fully autonomous operational capability for modern enterprises.

Retool is an AI-driven platform that helps teams design, build, and deploy internal software from a single unified workspace. It allows users to start with a natural language prompt and turn it into production-ready applications, agents, and workflows. Retool connects to nearly any data source, including SQL databases, APIs, and AI models, creating a real-time operational layer on top of existing systems. The platform supports AI agents, LLM-powered workflows, dashboards, and operational tools across teams. Visual app building tools allow users to drag and drop components while seeing structure and logic in real time. Developers can fully customize behavior using code within Retool’s built-in IDE. AI assistance helps generate queries, UI elements, and logic while remaining editable and schema-aware. Retool integrates with CI/CD pipelines, version control, and debugging tools for professional software delivery. Enterprise-grade security, permissions, and hosting options ensure compliance and scalability. The platform supports data, operations, engineering, and support teams alike. Trusted by startups and Fortune 500 companies, Retool significantly reduces development time and manual effort. Overall, it enables organizations to build smarter, AI-native internal software without unnecessary complexity.

Sendbird offers advanced communication solutions that harness AI technology, featuring an AI-driven customer service agent, Chat API, and Business Messaging, enabling fluid interactions with customers across various channels such as mobile applications, websites, and social media platforms. The platform is compatible with multiple environments, including iOS, Android, JavaScript, Unity, and .NET, ensuring versatile integration for developers and businesses alike. This comprehensive approach allows companies to enhance their customer engagement strategies effectively. Sendbird’s AI-driven customer service platform is designed to empower businesses to provide proactive, omnichannel support through intelligent AI agents. These agents deliver instant, 24/7 assistance on mobile, web, social media, SMS, and email, enhancing customer satisfaction while reducing response times and costs. The platform offers a centralized hub for creating and managing AI agents, with built-in tools for testing, monitoring, and optimizing agent workflows. By connecting all customer interactions into one unified system, Sendbird enables businesses to make smarter decisions, scale support efforts, and enhance customer engagement.

Devin Desktop is an AI-powered integrated development environment that enables developers to manage fleets of coding agents while maintaining complete control over the software development lifecycle. Built as the evolution of Windsurf, the platform combines advanced AI agents, a fully featured IDE, and collaborative workflow management into a single development experience. Developers can assign coding tasks to local or cloud-based agents, allowing autonomous execution of research, implementation, testing, debugging, optimization, and documentation activities. The platform's Agent Command Center provides centralized visibility into ongoing agent work, making it easier to coordinate multiple development efforts simultaneously. Features such as Spaces enable shared context and Git worktrees across agents, while Fast Context rapidly surfaces relevant code, files, and dependencies to accelerate development. Devin Desktop includes Supercomplete, which predicts developer intent beyond simple code completion, helping users work faster and remain focused. The platform supports multiple AI models and agent frameworks through the Agent Client Protocol, providing flexibility across different coding workflows and use cases. Extensive integrations with development, collaboration, monitoring, and project management tools allow organizations to connect AI-assisted development with their existing technology stack. Built-in code review, debugging, and traceability features ensure developers can inspect, validate, and refine every AI-generated change before deployment. The platform is designed for organizations that want to scale AI-assisted software engineering while maintaining visibility, governance, and code quality standards. Devin Desktop helps developers and engineering teams accelerate software delivery by combining autonomous AI execution with professional development tools and human oversight.

With the trust of over 25 million users globally, Jotform serves as a comprehensive platform that enhances data gathering, automates workflows, and facilitates online sales without requiring any coding skills. Utilizing Jotform’s intuitive drag-and-drop Form Builder, companies can easily design personalized forms and surveys to gather leads, contact details, payments, appointments, and e-signatures. Users can select from a library of more than 10,000 templates tailored for various purposes, such as feedback forms or event registrations, or opt to create their own unique forms from the ground up. The platform’s sophisticated features, including conditional logic, autoresponders, and compatibility with over 200 integrations, significantly optimize operational processes. Moreover, Jotform's AI-driven Agents provide immediate customer support by assisting users during the form submission journey, addressing inquiries, and ensuring a seamless experience, which minimizes the reliance on manual support. With the addition of Jotform’s Store Builder, businesses can establish an online storefront to market products, services, and subscriptions, as well as collect donations and process payments through a wide array of over 30 payment gateways. Furthermore, tools like the Approvals feature, PDF Editor, and Report Builder empower organizations to convert gathered data into insightful actions and streamline workflows for enhanced productivity. This multifaceted approach makes Jotform a vital resource for businesses seeking to improve their operational efficiency and customer engagement.

Glean is a comprehensive enterprise AI and workplace intelligence platform that enables organizations to connect, understand, and act on knowledge distributed across their technology ecosystem. The platform integrates with enterprise applications, collaboration tools, document repositories, customer systems, and business software to create a unified layer of organizational context. Through AI-powered enterprise search, assistants, deep research capabilities, content generation tools, and autonomous agents, Glean helps employees find answers, complete tasks, and make decisions faster. Its System of Context technology combines company knowledge, business processes, conversations, meetings, and permissions to deliver highly relevant and trustworthy responses. Glean includes AI agent orchestration, agent development tools, workflow automation, and an extensive library of connectors that allow organizations to automate complex business processes. The platform supports multiple large language models through a centralized Model Hub, providing flexibility while optimizing performance and cost. Security and governance are built into the platform with permission-aware access controls, comprehensive observability, compliance support, and enterprise-grade data protection. Organizations can use Glean to improve productivity, accelerate onboarding, reduce support workloads, and enable AI-driven workflows across the enterprise. The platform serves a wide variety of functions, including enterprise search, knowledge management, content creation, research, workflow automation, and AI-powered decision support. Glean is trusted by global enterprises to scale AI adoption while maintaining governance and operational control. By transforming scattered information into actionable intelligence, Glean helps organizations work smarter, move faster, and realize greater value from their enterprise data.

MuleSoft is an enterprise platform built to make AI agents, APIs, applications, data, and systems easier to connect, govern, secure, and orchestrate from one centralized control plane. It helps organizations move into the agentic era by giving IT teams the tools to manage AI-driven interactions without losing visibility or control. MuleSoft Agent Fabric enables companies to govern and coordinate AI agents across different platforms, supporting compliance, performance improvement, and stronger business value. MuleSoft Omni Gateway helps teams oversee every interaction between APIs, agents, models, and enterprise systems across multiple environments. The platform also includes Trusted Agent Identity, which helps agents securely act on behalf of users when interacting with downstream services. With MuleSoft Agent Scanners, organizations can discover AI agents across platforms such as Amazon Bedrock and Google Vertex AI, then register them in a governed system to reduce shadow AI. MuleSoft Agent Registry centralizes agents, tools, and digital assets, while Agent Broker supports complex process orchestration through defined rules and dynamic task routing. The platform also supports multi-agent collaboration, API governance, monitoring, partner management, intelligent document processing, and hundreds of prebuilt connectors. Development teams can build APIs, integrations, and automations using natural language, clicks, or code through tools such as MuleSoft Vibes, MuleSoft Your Way, and Anypoint Code Builder. MuleSoft also supports customer success through professional services, training, partners, documentation, tutorials, demos, and community resources. MuleSoft is built for organizations that want to accelerate AI adoption, modernize integration, improve governance, and confidently scale agentic workflows across the enterprise.

LM-Kit.NET serves as a comprehensive toolkit tailored for the seamless incorporation of generative AI into .NET applications, fully compatible with Windows, Linux, and macOS systems. This versatile platform empowers your C# and VB.NET projects, facilitating the development and management of dynamic AI agents with ease. Utilize efficient Small Language Models for on-device inference, which effectively lowers computational demands, minimizes latency, and enhances security by processing information locally. Discover the advantages of Retrieval-Augmented Generation (RAG) that improve both accuracy and relevance, while sophisticated AI agents streamline complex tasks and expedite the development process. With native SDKs that guarantee smooth integration and optimal performance across various platforms, LM-Kit.NET also offers extensive support for custom AI agent creation and multi-agent orchestration. This toolkit simplifies the stages of prototyping, deployment, and scaling, enabling you to create intelligent, rapid, and secure solutions that are relied upon by industry professionals globally, fostering innovation and efficiency in every project.

AI coding tools have fundamentally changed how software gets built. Developers are shipping more code, faster, with less friction than ever before. But the organizations benefiting most from AI-accelerated development are running into the same wall: quality hasn't kept pace. More code means more surface area for bugs. More PRs means more review burden on senior engineers. More releases means more chances for regressions to reach customers. The bottleneck has moved from writing code to verifying it, and verification is still largely manual. Checksum is a continuous quality platform built for this reality. Its suite of AI agents autonomously generates, runs, and maintains tests across every layer of the software development lifecycle: end-to-end UI flows, API endpoint coverage, and PR-level CI validation, so engineering teams can move fast without sacrificing reliability. What sets Checksum apart: it doesn't wait for instructions. It works as a background agent, continuously monitoring your codebase, generating tests for what matters, and repairing broken tests as the product evolves. Seventy percent of test failures resolve automatically, eliminating the maintenance burden that causes most test suites to decay and get abandoned. Every test Checksum produces is real, Playwright code you own, submitted as a PR to your repository. No vendor lock-in. Teams keep full control. Checksum is fine-tuned on 1.5+ million test runs and integrates natively with Cursor, Claude Code, and 100+ AI coding agents via /checksum slash commands. Testing happens before code review, not after. Generation and healing run on Checksum's cloud, consuming no LLM tokens or local resources. The bottom line: Checksum gives engineering teams the confidence to ship at the speed AI makes possible.