JouleNo account · No cloud · Just Bluetooth
Your power station, at a glance.
Joule shows what your FOSSiBOT power station is doing and lets you control it from your iPhone or iPad. It talks to the station directly over Bluetooth, so it works with no internet at all.
Coming soon to the App StoreFor iPhone and iPad, iOS 26 or later. Free, with a one-time Joule Pro purchase for the station's settings.
What it does
Everything the station's small screen tells you, and the switches on its front, on the phone in your hand.
See
Battery level and the time until it's full or empty. Watts coming in from the wall, solar or the car, and going out to AC, USB and 12 V. One picture of where the energy flows, and the faults the station reports, in plain words.
Switch
Turn the AC, USB and 12 V outputs on and off. The light: on, SOS, flashing, off. Turn the whole station off. Siri and Shortcuts work too, in English: “Joule status”, “Turn on AC in Joule”.
Look back
Battery level and power over the last 7 days, with the energy that went in and out. History is recorded while Joule is open and connected, and stays on your device.
Free, and Joule Pro
Watching your station and switching its outputs and light are free. Changing the station's settings takes Joule Pro, bought once.
Free
- Battery, power, time left and power flow
- AC, USB, 12 V and the light
- Turning the station off
- 7 days of history
- Siri and Shortcuts
$4.99 once, in the US
- Battery range: charge only to 80%, keep a reserve
- Wall charging speed, where the station lets an app set it, and silent charging
- Timers that turn idle outputs and the station off
- Solar and car input, button sounds
No subscription. In Ukraine Joule Pro is $3.99, and elsewhere the App Store shows its price in your currency. Joule Pro is shared with your family through Family Sharing, and Restore Purchase brings it to your other devices. The built-in demo station lets you try every setting before buying.
Which stations
Joule was built and tested on the FOSSiBOT F1200.
The same family
Other FOSSiBOT stations, such as the F2400 and F3600 Pro, and the same hardware sold as AFERIY, ABOK and Eco Play, speak the same Bluetooth language. If your station works with the BrightEMS app, Joule should find it, and it shows the controls that station has.
Not tried yet
Those other models haven't all been tried. A few newer ones can only be watched for now, not changed. If you agree to share anonymous diagnostics, Joule tells the developer how your model differs, and support for it follows.
Private by design
Nothing to sign up for
No account, no ads, no tracking. Joule and your station talk over Bluetooth, and nothing about you goes anywhere.
Diagnostics, if you say yes
Joule asks once whether to share anonymous data about how your station behaves. Say no and nothing is sent. Change it any time in Settings.
Never shared
The station's serial number, its Bluetooth address, the name you gave it, your location, name or email. The privacy policy has every detail.
Help & support
Joule doesn't find my station
Turn the station on and keep it within a few metres. A station talks to one phone at a time, so close BrightEMS or any other app that's connected to it, on every phone nearby. Check that Bluetooth is on and that Joule may use it: Settings › Apps › Joule › Bluetooth.
Can I check the station when I'm away from home?
No. Joule reaches the station over Bluetooth, a few metres at most, and never through the internet.
Why can Joule only watch my station?
Some newer stations keep their settings in a layout Joule doesn't know yet, so it shows their readings and leaves the switches to the station or its own app. Sharing diagnostics is how such a model gets supported.
Why can't I change the wall charging speed?
On the F1200 and many other stations, a knob on the station sets it. Joule shows the step the knob is on.
How do I get Joule Pro on my other iPhone or iPad?
Open the station's Settings in Joule, tap Joule Pro, then Restore Purchase. It uses the Apple Account that bought it, or your family's with Family Sharing.
Is Joule made by FOSSiBOT?
No. Joule is an independent app by one developer, built on what the FOSSiBOT community worked out about the stations' Bluetooth protocol.
Something else, or something's wrong
With diagnostics sharing on, open Settings › Diagnostics › Report a Problem in Joule and say what you see. It sends your note with the station's readings and gives you a six-character reference. Then write to the developer through alex.brazh.me and mention that reference.