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Standalone smartwatch/smartband for offline use

I am planning to buy a smartwatch/smartband (something like Amazfit Stratos 2 or Ticwatch Pro) but I have very specific requeriments because I will need to pair it with an Android 7/8 tablet which has no Internet connection (no mobile data, no WiFi, it is exclusively for offline use).

Using my laptop I may download any app (APK) from Google Play, transfer it via USB to the tablet and install it, but as long the tablet has no Internet access I won't be able to register or sign up the app.

Moreover I just need the usual sensors to monitor:
- heart rate,
- sleep pattern/quality,
- recovery time,
- activity tracking,
- pedometer,
- and such,
and, of course, be able to sync, track and review all this data using the tablet app.

Other requirements:
- Standalone (it won't need a nearby smartphone/tablet in order to gather data).
- Waterproof.
- Good indoor/outdoor visibility.
- Customizable faces.
- GPS is not needed (but I don't mind if the best model which fits my specifications has it).
- Touchscreen (size around or over 1.34" and at least 240x240 pixels)
- Decent battery (at least it should last one day).
- Reliable warranty.
- I don't need: camera, notifications, NFC, Android pay, SIM card tray, 2G/3G/4G/LTE...

Optional requirements:
- Nice design.
- Round faced.
- Stainless steel body.
- Light weight.
- Not bulky.
- AMOLED/OLED touchscreen.
- Water resistance (f.e. to swim, 5ATM and such)
- Shock resistance.

At last I don't want any Samsung product, in my extensive experience as a Samsung user (TV, smartphones, smartwatches, hard drives,...) I have realized they always find the way to void the warranty.

I don't have luck asking for help in stores or in the manufacturers presales support and I would like to save the time ordering and returning items so any help will be welcome.

Thanks in advance.

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All Answers

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Re: smartwatch

In reply to: Standalone smartwatch/smartband for offline use

Why not connect the tablet to the internet for a moment to register the app if it's needed and that solves your problems? You can just as easily disable WiFI afterwards.
To communicate with the watch it uses Bluetooth.

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Connect the tablet to Internet is not an option

In reply to: Re: smartwatch

I am willing to use BT to sync the smartwatch/smartband and the tablet but the tablet contains sensitive information and since most app are not open source there is no way to know which data, including data about the device itself, will send to their servers, so I won't connect the tablet to any open network.

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Re: connect to Internet

In reply to: Connect the tablet to Internet is not an option

Then it's easy. Not only buy the smartwatch you want, but also buy a cheap (sub-$100, new, refurbished or second-hand) tablet. Don't put any sensitive information on it, only use it for installing and running the app that comes with the watch. Probably, you'll only need to connect it to Internet initially, and then periodically for software updates.

I don't expect any open source equivalent for such an app.

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A previous experience

In reply to: Re: smartwatch

A couple of months ago, I have tried that method with a former colleague using a Amazfit Stratos 2 and a smartphone. At boot the smartwatch does nothing except show a QR code to pair it with the app, so we installed the Amazfit app, signed up and got a link to verify the email address. That was the last thing we could do because in spite of the email address was successfully verified, we were not able to login and the app remained showing an odd "Login error" over and over. Finally it does not work even connecting the device to Internet for a while only to register the app so the smartwatch was returned.

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In your case

In reply to: Standalone smartwatch/smartband for offline use

It appears there is no current product that matches. Be ready for people to tell you are hunting for unicorns. That's OK, you know what you want so keep hunting.

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Hunting unicorns

In reply to: In your case

I hope there are people in a similar situation, otherwise I will wait for a compatible open source app but ultimately it is just a gadget, I don't need to buy it right now, it is not a matter of life and death.

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