# Flux Chat: Ask, Plan, and Spec Your Device for Free Flux Chat is free. Ask questions about your device, weigh electronics and mechanical trade-offs, and write the spec inside your Flux project. Then build it in Agent mode. Written by [Matthias Wagner](https://flux.seobdtools.com/natarius) Published Oct 2026 - 2 min read ![Flux Chat: Ask, Plan, and Spec Your Device for Free](https://flux.seobdtools.com/p/assets/blogs/flux-chat-free-ask-plan-spec/main.webp) Every device starts with questions. What are the requirements? How big can the enclosure be? Which power architecture fits the battery? How does the board mount, and where do the connectors exit? The answers become the spec, and the spec decides how good the device will be. **Flux Chat** is where that work happens. Ask it about your device: the electronics, the mechanics, or how they fit together. Then turn the answers into a plan that the Flux agent can build. **Chat is free. It does not use your AI usage, and it is never billed.** ## Ask first, build second Chat is for the thinking before the work: - **Ask about the electronics.** "Explain how this board is powered and what limits the runtime." - **Ask about the mechanics.** "What wall thickness and mounting approach make sense for an IP67 enclosure around this board?" - **Read your documents.** "Summarize this datasheet and the mechanical drawing, and list what constrains the board outline." - **Weigh trade-offs.** "Compare a single-board design with a main board and a daughter board in this housing." - **Write the spec.** "Turn these notes into a device specification with electrical, mechanical, thermal, and manufacturing requirements." Chat reads your Flux project and your uploaded files. Its answers are about your device, not about a generic one. ## A better plan makes a better device A design agent can only be as good as the brief that it gets. A spec that you write in a separate chat tool and paste into a design tool loses the discussion that shaped it: why a connector moved, which clearance matters, and what the enclosure must survive. The agent sees *what* to build, but not *why*. When you plan in Flux Chat, the plan and its reasoning are already in the project. When you switch to **Agent** mode, the agent starts from the full picture. The result is a board and an enclosure that fit together. ## Chat and Agent: one project, two modes | | Chat | Agent | | --- | --- | --- | | Use it to | Ask, explain, plan, and write specs | Research parts, design the electronics and the mechanics, simulate, and export for manufacturing | | Project access | Reads the whole device | Reads and changes the whole device | | Cost | **Free** | Uses AI usage | Agent mode does the work. It selects parts, captures the schematic, lays out the PCB, designs the enclosure and the brackets, runs simulations, and generates manufacturing files. Chat and Agent share one project, so you can move between them at any time. Plan in Chat, build in Agent, and come back to Chat to review what changed. ## Try it Open a Flux project, select **Chat** in the composer, and ask about your device. Write the spec there. When the plan is ready, switch to **Agent** and build it. **Ask and plan for free in Chat. Build the whole device in Agent.** ## About the author [Matthias Wagner](https://flux.seobdtools.com/natarius) Founder & CEO at Flux Matthias is the Founder and CEO of Flux, a hardware design platform that's revolutionizing how teams create and iterate on circuits. Find him on Flux [@natarius](https://flux.seobdtools.com/natarius). Let’s start building Build your big idea together with Flux. All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. ![Close-up photo of a PCB made with Flux, with an ESP32 module, buttons, and a microSD slot.](https://flux.seobdtools.com/p/assets/blogs/miscellaneous/sidebar-cta-pcb.webp) [Try it Free](https://flux.seobdtools.com/signup) ## Related Content [ ![Teal technical illustration of a circuit board and enclosure with hand-drawn circles and arrows](https://flux.seobdtools.com/p/assets/blogs/markup-mode/main.webp) ### Circle it. Ask Flux. 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All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. [Try it Free](https://flux.seobdtools.com/signup) ![Close-up of a Flux-designed printed circuit board](https://flux.seobdtools.com/p/assets/homepage-v2/mission-visual.webp)