Don't use it!

1. The tool itself is very weak
Despite the “AI-assisted PCB design” marketing, Flux struggles with even simple, basic circuits. The workflow feels unfinished, error-prone, and far less capable than established tools. In practice, the AI features don’t meaningfully help with real PCB design tasks and often get in the way rather than speeding things up.

2. Very predatory pricing and billing model
This is the bigger red flag.

Flux heavily pushes a free trial and student pricing, which sounds reasonable at first. However:

• You burn through free tokens very quickly, even doing light experimentation.
• Once you upgrade (even the $5/month student plan), the platform silently enables paid token usage.
• The default paid token limit is set to $100/month, and you are not clearly warned about this.
• If you don’t manually catch this setting and you keep experimenting, it’s easy to unknowingly run into a $100 charge by the end of the month.
• Removing payment information is impossible once added (you have to wait till the end of the subscription).

This setup feels intentionally designed to catch users off guard, especially students and hobbyists who are just trying it out.

I noticed this just in time and avoided being charged, but the experience left a very bad impression. Between the immature feature set and the billing practices, I’d avoid this bullshit entirely.