I'm just guessing but one reason could be to avoid having to support foreign payment, tax and possibly warranty regimes (Jolla, the company behind Sailfish OS, is based in Finland).
Also they might want to avoid doing business in countries that support software patents and are over litigious over that (eq. USA).
But this limitation is pretty much artificial - the only thing you need to do from the EU is buying the image. This can be achieved via an EU based VPN (reportedly the built in VPN in Opera works) and AFAIK any mainstream payment card will work (does not have to be from an EU country).
Once you got the license and installation image, there are no real EU specific limitations. I have used Sailfish OS twice while on a trip in Japan and all worked just fine - repo access, etc. Also from the download statistics from OpenRepos (a community package repository for Sailfish OS), you can see there is a lot of users from countries that are not officially supported:
I went with a IotaWatt for measuring my home energy usage. It is based on the ESP8266 and is completely opensource hardware and software. You retain control of your data or you send to an external server.
It doesn't measure voltage and thus can't measure true energy consumption = power, only currents. It then must estimate power based on some preset voltage. Not to mention those clamps can't have precision or time resolution for truly interesting stuff.
A toy, in other words. It might be good enough to get a rough idea what eats more or less and when, but it'll never match the utility power meter which is what you're paying by.
cdrc: I rewire my houses myself, because those licensed loons can't be trusted with a 12V light bulb. At least that way _I_ am sure it won't blow up or burn or whatever.
Still, inductive current measurement with the sizes of the clamps they show and typical currents they're measuring isn't accurate at all. Not even considering that voltage measuremens via a wall wart would depend on what load is currently sharing the same wiring.
This might be my bias since I design similar stuff for solar offgrid, where a percent or ten off are that much in capex divided by battery lifetime, then multiplied by battery cost. It bites.
I don't trust inductive clamps at low currents. I would never trust measuring voltage on the same line as a load.
Hall sensors or current shunts; voltage dividers - all driving MCU ADC channels via optoisolated opamps. Everything measured as near to the source as possible. Otherwise you're getting nearly worthless data.
Then you haven't taken into account noise building up in every half inch of a cable that leads from the clamp to the instr-amp. Or do you advocate clamps with built-in ADCs? No objection then, as long as the wires carry digital signal but for the fact that this would cost so much it isn't funny. One might as well stick to off-the-shelf PLC-style rail-mounted IO modules and shunts/transformers then.
I don't know about IOS, but for Android, there is Android Auto by Google. It makes the UI larger and easier to use, and minimizes what you can do in the car. It will even read texts to you.
