What aI agent builders tools are for
AI agent builders connect a model with instructions, documents and tools to carry out a defined task. They serve teams that want to move beyond conversation and organize work involving steps and actions. Depending on the platform, you can build a visual workflow, retain context or connect an agent to an application. Previously, someone might read a customer request, consult a procedure and draft a reply for approval. With a suitable agent, they delegate that preparation, inspect the information used and approve the proposed reply before sending it. Botpress, for example, supports connecting an agent to a knowledge base and automating customer responses. Designing an agent means deciding what it may choose, which tools it can access and when a person must take over. Useful evaluation therefore includes the actions performed, not just the wording of the final answer.
Example uses:
- You prepare replies to customer requests using documents, then have someone review the proposed messages before sending.
- You build an agent that consults permitted tools to gather the information needed for an internal request.
- You organize a process with defined steps and human intervention when required information is missing or unclear.
- You compare agent versions on the same tasks to assess the effects of changes to their instructions.
- You schedule recurring preparation work and inspect the results before allowing the agent to perform external actions.
Our picks by need
These picks follow simple rules applied to the verified data, with no partnership or affiliate link:
The main tools at a glance
Dify 81/100
Dify assembles workflows in a visual editor and creates agents that use multiple tools. It serves people who want to connect documents to assistants, publish applications or host the platform themselves. Features: Assemble workflows in a visual editor; Create agents that use multiple tools; Connect documents to an assistant. Entry price: $590 per year, with a free tier. Runs on: web browser and API.
Agenta 78/100
Agenta is an open-source tool for people building agents with instructions and tools. It supports scheduled tasks, version comparisons, execution inspection, and human approval for selected actions. Features: Create agents with instructions and tools; Trigger tasks on a schedule; Compare the results of multiple versions. Entry price: $29 per month, with a free tier. Runs on: web browser, API, and Slack. Data hosting: Several regions.
AutoGen 78/100
AutoGen lets people building AI agents assemble several agents within one workflow. It offers visual configuration, connections to models and tools, testing of agent exchanges and configuration exports for reuse. Features: Assemble multiple agents in a single workflow; Configure agents in a visual interface; Connect agents to models and tools. Free tier available. Runs on: web browser and API. Data hosting: On device.
Hermes Agent 73/100
Hermes Agent lets users execute tasks with tools and a terminal while retaining memory between sessions. It can create reusable skills, schedule recurring tasks, browse the web, and receive requests through messaging services. Features: Execute tasks with tools and a terminal; Retain memory between sessions; Create reusable skills from completed tasks. Entry price: $20 per month, with a free tier. Runs on: Windows, macOS, Linux, Android, API, Slack, and Microsoft Teams.
Mastra 73/100
Mastra lets developers create agents connected to models and tools. It supports multistep workflows, conversation memory, agent testing and trace inspection, and deployment on a hosted platform. Features: Create agents connected to models and tools; Build multistep workflows; Retain conversation memory. Entry price: $250 per month, with a free tier. Runs on: web browser and API. Data hosting: Several regions.
OpenClaw 71/100
OpenClaw lets people control an assistant from a messaging service. It can perform browser actions, read and prepare emails, and retain a memory between conversations with users. Features: Control an assistant from a messaging service; Perform actions in a browser; Read and prepare emails. Free tier available. Runs on: web browser, Windows, macOS, Linux, iPhone and iPad, Android, Slack, and Microsoft Teams. Data hosting: On device.
Botpress 68/100
Botpress is for people building AI agents with a visual editor. It allows users to connect agents to a knowledge base, automate customer responses, and connect external services. Features: Build an agent with a visual editor; Connect an agent to a knowledge base; Automate customer responses. Entry price: $150 per month, with a free tier. Runs on: web browser and API. Data hosting: Several regions.
MindStudio 68/100
MindStudio helps teams building AI applications create agents with a visual editor. It combines models within workflows, supports testing and deployment, runs agents through an API and tracks operating costs. Features: Build agents with a visual editor; Combine multiple models in a single workflow; Test and deploy AI applications. Entry price: $20 per month, with a free tier. Runs on: web browser, browser extension, and API.
Orkas 68/100
Orkas divides an objective among specialized agents for people producing documents, presentations, applications or websites. It performs research, creates editable PowerPoint presentations and allows recurring tasks to be scheduled. Features: Divide an objective among multiple specialized agents; Conduct research and produce documents; Create editable PowerPoint presentations. Entry price: $11.99 per month, with a free tier. Runs on: Windows, macOS, Linux, and API. Data hosting: Several regions.
Voiceflow 65/100
Voiceflow lets businesses visually build conversational agents connected to their documents and external services. These agents can be deployed on voice and text channels, with conversation and performance review. Features: Visually build a conversational agent; Connect an agent to company documents; Connect external services via API. Free tier available. Runs on: web browser and API. Data hosting: Several regions.
The category in figures
Of the 20 tools in the category, 17 (85%) offer a free tier, 70% have a public API and 2 have a French interface. The median entry price, per month, is $20 (across 11 tools with a published price). 12 disclose where data is hosted, 4 of them in Europe or on device.
All aI agent builders tools
Click a header to sort. Data checked on official sites, October 24, 2026.
| Tool | Free | Entry price | API | Data | Score |
|---|---|---|---|---|---|
| Dify Dify assembles workflows in a visual editor and creates agents that use multiple tools. It serves people who want to connect documents to assistants, | Yes | $590 per year | Yes | Not disclosed | 81 |
| Agenta Agenta is an open-source tool for people building agents with instructions and tools. It supports scheduled tasks, version comparisons, execution insp | Yes | $29 per month | Yes | Several regions | 78 |
| AutoGen AutoGen lets people building AI agents assemble several agents within one workflow. It offers visual configuration, connections to models and tools, t | Yes | not published | Yes | On device | 78 |
| Hermes Agent Hermes Agent lets users execute tasks with tools and a terminal while retaining memory between sessions. It can create reusable skills, schedule recur | Yes | $20 per month | Yes | Not disclosed | 73 |
| Mastra Mastra lets developers create agents connected to models and tools. It supports multistep workflows, conversation memory, agent testing and trace insp | Yes | $250 per month | Yes | Several regions | 73 |
| OpenClaw OpenClaw lets people control an assistant from a messaging service. It can perform browser actions, read and prepare emails, and retain a memory betwe | Yes | not published | – | On device | 71 |
| Botpress Botpress is for people building AI agents with a visual editor. It allows users to connect agents to a knowledge base, automate customer responses, an | Yes | $150 per month | Yes | Several regions | 68 |
| MindStudio MindStudio helps teams building AI applications create agents with a visual editor. It combines models within workflows, supports testing and deployme | Yes | $20 per month | Yes | Not disclosed | 68 |
| Orkas Orkas divides an objective among specialized agents for people producing documents, presentations, applications or websites. It performs research, cre | Yes | $11.99 per month | Yes | Several regions | 68 |
| Voiceflow Voiceflow lets businesses visually build conversational agents connected to their documents and external services. These agents can be deployed on voi | Yes | not published | Yes | Several regions | 65 |
| Dynamiq Dynamiq lets teams build AI agents in a visual editor and connect them to company documents, applications, and databases. It supports deployment, resp | Yes | not published | Yes | Several regions | 63 |
| Relevance AI Relevance AI lets teams build agents without writing code and have multiple agents cooperate. They can connect agents to company tools, schedule autom | No | $19 per month | Yes | Several regions | 60 |
| Genspark Genspark helps people research the web and carry out tasks with agents. It supports preparing presentations, documents and tables, generating images, | Yes | $239.99 per year | – | United States | 60 |
| GPT Researcher GPT Researcher lets users conducting research break down questions and consult web sources or local documents. It writes reports with references and e | Yes | not published | Yes | Not disclosed | 58 |
| AI Agent Store AI Agent Store serves people searching for, comparing, or creating specialized agents. It supports hosted agents with persistent memory, role assignme | Yes | not published | Yes | Not disclosed | 48 |
| AgentGPT AgentGPT is an open-source web tool for people configuring an agent with a name and an objective. It breaks that objective into tasks, executes them, | Yes | not published | – | Not disclosed | 48 |
| Rasa Rasa lets teams build conversational agents and define flows in a visual editor. It serves users who want to connect external services, test conversat | Yes | not published | Yes | On device | 48 |
| BrainSoup BrainSoup lets Windows users create agents with specialized roles and have them work together. Agents can access user documents and automate Windows a | No | $5 per month | – | On device | 46 |
| BrainstormGPT BrainstormGPT lets users define roles for multiple agents and have them discuss a topic. Automatic research adds information to the discussion, and a | Yes | not published | – | Not disclosed | 38 |
| Lindy Lindy lets users execute tasks in connected applications, sort an inbox, and prepare email replies. It also supports taking meeting notes and running | No | $49.99 per month | – | Not disclosed | 30 |
Also useful
These tools belong to another category but also cover this need:
- LlamaIndex LlamaIndex lets teams processing documents extract content, structure tables, and index documents for search.
- AITable.ai AITable.ai helps people managing data and projects create linked tables, forms, and dashboards. It also suppor
- Codex Codex lets people developing software write and edit code, fix errors, run commands and tests, and review repo
- Taskade Taskade lets people organizing projects create applications and agents that use their documents. It also suppo
- LangSmith LangSmith examines agent steps and compares results across versions. It serves people who want to create test
- Microsoft 365 Copilot Microsoft 365 Copilot helps people working in Microsoft 365 applications write content and analyze work data.
- LibreChat LibreChat brings multiple model providers into one interface for chatbot users. It supports creating agents co
- n8n n8n helps people automate tasks between applications using visual workflows. It triggers tasks from events, tr
- Overmind Overmind supports teams evaluating and training specialized models. It lets users inspect agent execution trac
- Tiledesk Tiledesk lets customer service teams build agents with a visual editor. It answers from a knowledge base, tran
- Vanna Vanna serves teams querying databases through questions. It generates SQL queries, displays results as tables
- Gemini platform (Vertex AI) Gemini platform (Vertex AI) serves teams developing artificial intelligence models and agents. It supports tra
Choosing well and avoiding pitfalls
Define a bounded task, its inputs, expected results and prohibited actions. Test the tools you actually need and French interaction quality where relevant. Review permissions, human approval steps and ways to stop execution. Check how memory is retained, corrected and deleted. Examine integrations, configuration exports and access to useful traces. Compare billing conditions for model calls, tools and executions. Consider maintenance skills as well: visual editors and development frameworks require different kinds of work. Choose a setup whose decisions and actions your team can inspect when a result is unexpected or incomplete.
An agent can misread instructions, choose an unsuitable tool or repeat an action after a failure. Restrict permissions and require approval for consequential operations. Retrieved pages and documents may contain malicious instructions, so keep their content separate from governing rules. Test interruptions, recovery and missing information. Persistent memory can retain errors or personal data; provide review and deletion procedures. Set execution limits and inspect outcomes. Evaluate what the agent actually changed rather than relying solely on its account of the work it performed.
To compare with the cost of using an AI model directly, see the API price calculator.
Free or paid?
Free access may let you build a demonstration agent and try tools within stated restrictions. Model calls and connected services can have separate conditions. Paying becomes useful for regular operation, shared access, additional integrations or suitable operational controls. Review the complete workflow, including dependencies, before deciding whether a plan covers the way you intend to use the agent.
Tools in the category with a free tier: Dify, Agenta, AutoGen, Hermes Agent, Mastra, OpenClaw, Botpress, and MindStudio.
For which jobs?
The profiles that use these tools most, based on the use cases documented by publishers: developers, project managers, small business owners, marketers, customer support, and freelancers.
Related categories
Learn more
Frequently asked questions
What is the best tool to build your own AI agents?
On our access and transparency grid, Dify (81/100), Agenta (78/100), and AutoGen (78/100) come first. Test two of them on your own examples: output quality depends a lot on your case.
Are there free tools?
Yes, 17 of 20 tools have a free tier, often limited in volume: Dify, Agenta, AutoGen, and Hermes Agent.
How is an agent different from a conversational assistant?
An agent can use tools and carry out steps toward an outcome, within its permissions. A conversational assistant may only return answers. Services draw these boundaries differently. Focus on the actions available in your setup, the information the system can access and the approval steps that apply before it changes anything.
Can I let an agent act without approval?
That depends on the consequences and whether actions can be reversed. Begin with restricted permissions and preparation tasks. Review observed failures before expanding autonomy. For sending messages, deleting material or changing sensitive records, include approval and a trace that lets you establish what happened if the outcome is disputed or unclear.
How should I test an agent before team use?
Prepare ordinary requests, ambiguous situations and cases where a tool fails. Check the outcome, actions taken and compliance with restrictions. Include documents containing unwanted instructions. Keep these examples for version comparisons and involve future users in reviewing results, including whether the agent knows when to stop and ask for help.
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Neutrality. No affiliate links. No vendor pays to be reviewed, rated or ranked. Reviews are directed by François Chollet, neutral and factual, and every data point is dated and sourced. How we score