Helios
Make your energy visible, in 2.5D.
The Home Assistant card that turns your Energy dashboard into a real-time 2.5D scene: what your home produces, stores and consumes, as the sun tracks across the sky. With or without solar panels.
Two projects. One belief.
Energy you can see is energy you can act on.
Helios Forecast
Stay ahead of your solar production.
A solar production forecast that learns on its own and runs entirely on your own Home Assistant. It feeds the Energy dashboard, adjusts to what your panels actually produce, and never sends your data anywhere.
Why I built it
We can still turn this around.
I'm Jérôme, 44, the developer behind Helios. After years spent across the whole stack, backend, frontend, 3D, games, embedded, I wanted to build something that truly matters to me.
A card won't save the planet, I know. But guilt and numbers nobody reads change no one: we change when we can finally see what's happening in our own home. That's the whole point of Helios: make energy visible, tangible, even beautiful, so that acting stops being a chore and becomes the obvious thing to do.
Helios is free and open source, built by a single person, in full transparency.
Helios is an independent community project. It is not created or endorsed by, nor affiliated with, the Open Home Foundation or Home Assistant. Home Assistant and the Home Assistant logo are trademarks of the Open Home Foundation.
ReikanYsora - Jérôme CREMOUX - 2026