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Substructure Review

Substructure provides an engine for creating agents that operate in the cloud, allowing integration with Slack and control over workflows from your own systems.

shipped Aug 14, 2026agentsfreemium
agents
Substructure — product screenshot

Why it matters

1Offers a freemium pricing model with a 14-day free trial.
2Integrates with Slack and OpenRouter for enhanced functionality.
3Supports various LLMs including DeepSeek V4 Flash, GLM 5.2, and OpenAI models.
4Data retention policies vary by plan, from 14 to 365 days.

About Substructure

Business Model
Subscription SaaS
Founded
2026
Team Size
10-50
Funding
Bootstrapped
Platforms
Web
Target Audience
Teams looking to develop automated agents

Pricing Plans

Free Tier
Free
  • Basic features
  • Limited agent deployments
Pro Tier
Contact for pricing / monthly
  • Advanced features
  • Unlimited agent deployments
  • Priority support

Leadership

AlexCo-Founder
API DocsGitHubOpen Source

Specs

API Available

Yes, public API

overview

What is Substructure?

Substructure is an AI agent engine tool developed by Substructure that enables developers, engineers, and teams to build, deploy, and manage cloud-based AI agents. It facilitates easy connection of Large Language Models (LLMs) and Managed Cloud Platform (MCP) servers to streamline processes and integrate with platforms like Slack.

features

Key Features of Substructure

Substructure offers a robust set of features designed for the development and deployment of cloud-based AI agents, emphasizing integration, customization, and flexible hosting.

  • Integration with Slack for agent interaction within communication channels.
  • Handles Large Language Model (LLM) requests from various providers (e.g., DeepSeek V4 Flash, GLM 5.2, OpenAI models).
  • Supports webhook customization for flexible data flow and system integration.
  • Allows local agent development using a Command Line Interface (CLI).
  • Provides an engine for creating agents that operate in the cloud.
  • Enables control over workflows directly from user-owned systems.
  • Facilitates easy connection of Managed Cloud Platform (MCP) servers.
  • Offers proprietary function calling capabilities for agent actions.
  • Customizable agent operational logic, known as the 'agent loop'.
  • Supports multimodality for text-based interactions.

use cases

Who Should Use Substructure?

Substructure is primarily designed for developers, engineers, and teams focused on building and deploying AI agents within cloud environments, particularly those requiring integration with existing communication and workflow systems.

  • Developers and Engineers: For building and deploying cloud-based AI agents, developing custom tools for agents, and customizing agent operational logic.
  • Teams building AI agents: For integrating agents with communication platforms like Slack and leveraging flexible hosting options (self-hosted or Substructure-hosted).
  • Organizations seeking workflow automation: For creating custom workflows, logging invoices, and managing tasks through AI agents.
  • Teams utilizing Multi-Channel Protocols (MCPs): For integrating data and processes with MCP servers.

how to use

How to Use Substructure

To begin using Substructure, users can sign up for a 14-day free trial and configure their Large Language Model (LLM) keys. The platform supports both local development via CLI and cloud deployment.

  • 1Register for a Substructure account and initiate the 14-day free trial.
  • 2Configure your own Large Language Model (LLM) API keys within the Substructure platform.
  • 3Utilize the Command Line Interface (CLI) for local development and iteration of agents.
  • 4Integrate agents with communication platforms such as Slack.
  • 5Develop and integrate custom tools that agents can utilize within your systems.
  • 6Deploy agents to the cloud, choosing between self-hosting or Substructure-hosted options.

pricing

Substructure Pricing & Plans

Substructure operates on a freemium model, offering a 14-day free trial without requiring a credit card. Users are responsible for providing their own Large Language Model (LLM) keys, ensuring consistent billing regardless of LLM usage. Pricing plans are structured based on 'turns' (one message to an agent, covering all its actions to respond) and history retention.

  • Free Tier: Free, includes a 14-day trial.
  • Dev Plan: $29 per month, includes 1,500 turns per month, 30 days of history, and unlimited projects.
  • Pro Plan: $99 per month, includes 25,000 turns per month, 90 days of history, and unlimited projects.
  • Scale Plan: $299 per month, includes 100,000 turns per month, 1 year of history, and unlimited projects.

Pros

  • +Provides a dedicated engine for cloud-based AI agents, suitable for team deployment.
  • +Offers deep integration with Slack and other communication platforms for agent interaction.
  • +Supports a wide range of Large Language Models (LLMs) and Managed Cloud Platform (MCP) servers.
  • +Allows extensive customization of agent operational logic and integration of custom tools.
  • +Features flexible hosting options, including self-hosting and Substructure-hosted solutions.
  • +Includes a 14-day free trial and transparent pricing based on 'turns' and history retention.

Cons

  • Specific user reviews and public reception are not readily available on major review platforms.
  • Requires users to bring their own LLM keys, adding an external dependency and cost.
  • The platform's specific new features or major announcements are not explicitly detailed in recent updates.
  • May have a learning curve for developers unfamiliar with agent engine concepts or Git-based configuration.
  • While offering a free trial, advanced features and higher usage limits are behind paid tiers.

Policies

Pricing Page

View Pricing

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Substructure vs Competitors

Substructure positions itself as a comprehensive engine for cloud-based AI agents, differentiating from alternatives by offering a full team-oriented platform with flexible hosting and deep integration capabilities.

1

Provides a comprehensive open-source framework for building applications with large language models, including pre-built agent architectures and integrations.

Requires coding expertise to implement and manage, offering maximum flexibility but a steeper learning curve compared to a more abstracted platform like Substructure.

2

Specializes in orchestrating collaborative, role-playing AI agents to work together on complex tasks, with support for Model Context Protocol (MCP).

It's a Python framework, demanding coding skills for setup and customization, which differs from a potentially more visual or managed cloud service like Substructure.

3

Offers a drag-and-drop visual interface for building and deploying custom LLM chains and AI agents, making development more accessible.

While providing a visual builder, it requires self-hosting, which adds an operational overhead compared to a fully managed cloud service like Substructure.

4

An open-source workflow automation tool that allows building AI agents to orchestrate tasks across over 400 integrated applications.

Its primary focus is workflow automation with AI capabilities, which might offer less granular control over custom agent logic compared to dedicated AI agent frameworks like Substructure.

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