I'm Franzl.
I take care of your energy.

Solar, battery, EV, heat pump, water heater, AC, pool: every manufacturer ships its own app, but none of them coordinates your devices. Franzl runs them as a team. Automatically, across brands, right in your home.

Local-first Brand-independent Runs on Home Assistant Made in Austria
App Store Google Play Install on Home Assistant

142 supported devices from 116 brands. Each model states what works and what doesn't.

The app
Franzl at work.
Franzl12:41
I'm charging your car at 12 A on solar surplus.
Wallbox · Garagecharging
4,2 kW
from solar surplus, adjusted minute by minute
Day plan14:00
Heat the water tank to 55 °C while the sun delivers.

What Franzl takes off your hands

Your car charges on sunshine

Franzl measures your real solar surplus and adjusts the wallbox continuously. Your car charges when your roof delivers, not the grid.

Learn more

Consumption moves to the cheap hours

On a dynamic tariff (e.g. aWATTar), Franzl knows tomorrow's exchange prices and shifts charging and heating to the hours where a kilowatt-hour costs the least.

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Heat from surplus, not from the grid

Hot water and heat pump prefer to run when solar power is left over. The surplus ends up as hot water in your tank instead of earning a few cents in the grid.

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The battery plays on the team

Franzl queues car, hot water and home battery in the order you want, say “battery first up to 80%, then the car”. Without you ever stepping in.

Learn more
Live dashboard. Real-time energy flow and a day plan: you always see what's running, what's scheduled, and why.
Solar forecast. A 48-hour forecast for your roof, so Franzl can plan ahead instead of just reacting.
Every decision explained. “Why is the battery charging right now?” Franzl tells you. In plain language, or technical if you prefer (expert mode).
Also AC, ventilation & pool. Pre-cool on surplus, run ventilation smartly, heat the pool when energy is left over.
Safety built in. Frost-protection and legionella limits are hard-wired. The optimizer can never cross them.
No tracking, no ads. Your energy data reveals how you live. It is not sold, not profiled, not advertised against.

Does Franzl fit your home?

Pick manufacturer and model. You'll see immediately what Franzl can do with them.

Do you already have Home Assistant?

Home Assistant is the free smart-home hub Franzl runs on. Never heard of it? The starter path explains everything.

Browse all 142 supported devices

Three ways to get Franzl

1

You already run Home Assistant

Then you're done in 10 minutes: install Franzl Gateway, open the app — it finds your gateway on your home network by itself, and your devices are discovered automatically.

See the guide
2

You don't have Home Assistant yet

The starter path: plug a Home Assistant Green into your network, put Franzl on it. Fully guided, no tinkering.

See the starter path
3

You're an electrician?

Franzl is looking for first-hour partners: businesses that set up Franzl for their customers and help shape how on-site setup works.

Become a partner

What stays with you. And what doesn't.

Local-first doesn't mean “no cloud” to us. It means you know exactly what runs where.

Runs in your home

  • The entire optimization and control, on your gateway
  • All energy data, in your own database
  • Keeps working when the internet is down
  • No profiling, no selling, no ads

Runs via cloud services

  • Login & account (Firebase)
  • Push notifications to your phone
  • Subscription billing via the app stores
  • Remote access on the go (encrypted tunnel, nothing stored in between)
  • Crash reports, only if you opt in

Exactly what flows where is in the privacy policy, without the legalese.

Why Franzl?

… instead of five manufacturer apps

Inverter app, wallbox app, heat pump app: each one only shows its own device. Franzl unites them in one app and makes them react to each other instead of running side by side.

… instead of Home Assistant tinkering

Home Assistant connects your devices but doesn't optimize anything. You'd have to build and maintain automations yourself. Franzl ships the finished optimizer. And an app the whole family understands.

… instead of cloud energy managers

No vendor lock-in, no data leaving your home, no “server unavailable”. The control runs in your house and belongs to you.

On your Home Assistant in 10 minutes

Nothing gets compiled: Home Assistant downloads the pre-built Franzl Gateway and installs it in seconds. The app guides you through the rest.

Add to my Home Assistant Step-by-step guide