Agent Builder by Thesys

Best Agent Builder by Thesys Alternatives in 2025

2 alternatives found

Overview of Agent Builder by Thesys

Agent Builder by Thesys is a no-code platform that lets you build AI agents capable of reasoning dynamically and generating rich, interactive outputs like charts, cards, forms, slides, and reports. You simply connect your data, add instructions, customize the style, and publish or embed the agent anywhere. It’s designed for users who want to create user-facing agents without writing code or designing workflows.

Why Look for Alternatives

While Agent Builder by Thesys excels at creating visually rich, interactive agents with minimal effort, it may not suit everyone. Developers who prefer full control over agent logic in code might find the no-code approach limiting. Teams needing deep integrations with hundreds of business tools or secure sandboxed execution may require more specialized solutions. Additionally, organizations focused on backend process automation rather than user-facing agents might need a different tool.

Top Alternatives

1. 21st Agents SDK (Score: 65/100)

21st Agents SDK is a code-first TypeScript framework for building AI agents. It offers fine-grained control over agent logic, tool definitions, and deployment. Key features include sandboxed runtimes (E2B with gVisor) for secure execution, drop-in React chat UI components for Next.js, an observability dashboard tracking cost, latency, and token usage, and one-command CLI deployment. It also supports custom authentication and credential management.

Pros: Full developer control, secure execution, easy frontend integration, built-in monitoring, simple deployment.

Cons: Requires TypeScript coding skills, lacks rich output generation (charts, cards, etc.), no visual builder or templates, no native data connectors, no white-labeling, usage-based pricing without a free tier.

Use cases: Choose 21st Agents SDK over Agent Builder if you are a developer who wants full control over agent logic in TypeScript, needs secure sandboxed execution, and prefers to integrate a chat UI into an existing app rather than using a no-code builder with rich output formats.

2. Aident AI (Score: 45/100)

Aident AI focuses on automating multi-step workflows across 250+ tools, making it ideal for process automation and integrations. It provides a live dashboard for monitoring and approvals, and supports creating automations using plain English descriptions.

Pros: Excellent for multi-step workflow automation, broad app integrations, monitoring dashboard, low barrier for non-technical users.

Cons: Does not emphasize building interactive agents with rich outputs (charts, forms, slides), more about backend automation than user-facing agents, lacks embedding and custom branding features.

Use cases: Choose Aident AI if your primary need is to automate repetitive business processes across many apps (e.g., Slack, Twitter, Shopify) and you want a dashboard to monitor and approve actions, rather than building interactive, user-facing agents that generate visual outputs.

How to Choose

When evaluating alternatives to Agent Builder by Thesys, consider the following factors:

  • Technical skill level: If you are a developer comfortable with TypeScript, 21st Agents SDK offers powerful control. If you prefer no-code, stick with Agent Builder or look for other visual tools.
  • Output requirements: If you need agents that produce charts, cards, forms, slides, or reports, Agent Builder is uniquely strong. Alternatives may not support these rich outputs.
  • Integration needs: For deep integrations with many business apps (250+), Aident AI is a strong choice. For secure sandboxed execution, 21st Agents SDK excels.
  • Deployment and branding: If you need to embed agents with custom branding and white-labeling, Agent Builder is better suited. 21st Agents SDK offers more deployment flexibility but less branding control.
  • Budget: Agent Builder has a free plan with 3,000 API calls/month. 21st Agents SDK is usage-based with no free tier. Aident AI’s pricing may vary.

Ultimately, the best alternative depends on whether you prioritize no-code ease, rich visual outputs, developer control, or workflow automation.

Alternatives

21st Agents SDK
1. 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).

Pros

  • + Code-first TypeScript approach gives developers fine-grained control over agent logic and tool definitions
  • + Built-in sandboxed runtimes (E2B with gVisor) for secure execution out of the box
  • + Drop-in React chat UI components that work with Next.js, reducing frontend integration effort
  • + Observability dashboard with cost per session, latency, and token usage tracking
  • + One-command deployment via CLI, minimizing infrastructure setup
  • + Supports custom auth (token exchange) and credential management for production use

Cons

  • - Requires TypeScript coding skills, unlike Agent Builder's no-code approach
  • - No built-in support for generating rich outputs like charts, cards, forms, slides, or reports
  • - Lacks a visual agent builder or template gallery for non-developers
  • - No native data source connectors (e.g., Snowflake) or file upload capabilities
  • - Does not offer white-labeling or custom branding options for embedded agents
  • - Pricing is usage-based with no free tier for high-volume use, whereas Agent Builder has a free plan with 3,000 API calls/month

Choose 21st Agents SDK over Agent Builder if you are a developer who wants full control over agent logic in TypeScript, needs secure sandboxed execution, and prefers to integrate a chat UI into an existing app rather than using a no-code builder with rich output formats.

Aident AI
2. Aident AI

Aident AI is an agentic automation editor. Describe what you want in plain English and Aiden turns it into a Playbook that compiles into scripts + prompts. Connect 250+ tools and keep updating the automation through chat as your process changes.

Pros

  • + Aident AI focuses on automating multi-step workflows across 250+ tools, making it better for process automation and integrations.
  • + It offers a live dashboard for monitoring and approvals, which is useful for managing complex automations at scale.
  • + Supports plain English description to create automations, lowering the barrier for non-technical users.

Cons

  • - Agent Builder by Thesys specializes in building interactive AI agents that return rich outputs like charts, forms, and slides, which Aident AI does not emphasize.
  • - Aident AI is more about backend automation and task orchestration, not about creating user-facing interactive agents with custom UI.
  • - Agent Builder allows embedding agents as apps or on websites with custom branding, which Aident AI lacks.

Choose Aident AI if your primary need is to automate repetitive business processes across many apps (e.g., Slack, Twitter, Shopify) and you want a dashboard to monitor and approve actions, rather than building interactive, user-facing agents that generate visual outputs.

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