An AI agent is the next step past a chatbot. A chatbot answers when you ask it something. An agent takes a goal, works out the steps, and acts across your tools on its own, then tells you what it did. For a business, that difference is the whole point: the value is not in the conversation, it is in the work that gets done without you in the loop for every click.
We reviewed these from the perspective of a real business that wants to offload repetitive work, not a research lab. The questions that drove each review: what can the agent actually do unattended, how much control do you keep, what does it cost once it is running at real volume, and where does it break.
The list splits along how the agent is used. No-code builders like Lindy, Relevance AI, and Gumloop let non-technical teams stand up agents for email, sales, support, and operations. Autonomous agents like Manus take a goal and run a whole multi-step job. Coding agents like Devin sit in a category of their own. Match the agent to the job before you compare prices.
