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Front end: PhoneGap, Xamarin, Flutter
Flutter might be your best bet here, but because it's so new it's a bit of a pain to find certain kinds of libraries.
Offline w/ sync, backend: PouchDB, TurtleDB, RXDB
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I may get flogged depending on how y'all feel about javascript, but I have found react-native (if you want a quick boost to get you going, react-native w/expo) to be very helpful.
I started looking into it in August and spent about 4 weeks just tinkering and learning. A simple offline app could be constructed much more quickly and deployed, depending on how well you like javascript. I actually think expo also has a method to submit to apple if you lack a Mac.
Best of luck.
- Freedom is the right of all sentient beings. (Optimus Prime, or Michael Bay, but I prefer Otpimus Prime)
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PWA is the way to go.
You can take any of the Microsoft website templates (or anything else for that matter) and make what you need. Then you go to pwabuilder.com and get a manifest/service worker to add to your code.
At the same site you get everything you need to submit to the Windows Store, Play Store and App Store.
Here is part 2 of a 25 part tutorial about everything you always wanted to know about PWAs:
PWA Tutorial for Beginners #2- Setting up a Project - YouTube[^]
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Been catching up on my CodeProject daily news and came across your question.
I did some work a couple of years ago on a single-page application written in ember.js and we had a requirement for the application to work in an "offline" mode. Once the user had logged onto the system they could enter offline mode and only offline modules would be available.
We used node.js to host a local rest api that would then be able to access local resources to save the relevant messages/data since we had the same issue with localstorage being cleared and couldn't have our messages disappear. The SPA was then also locally hosted and communicated with the node rest api (we used restify).
It appears as though node.js is available for mobile devices now also so perhaps you could consider something along the lines of a locally hosted web-site that uses the rest api as a store-and-forward mechanism.
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The app which does nothing can work everywhere without any UI and/or performance issues.
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The daily Bing image[^], of course 
I have an app that puts the image on my desktop's background.
This particular one made me scratch my head.
For a minute there I thought the building had a sticker or a painting of trees on the concrete below it.
The thought even crossed my mind that this was some very poor PaintShop job.
Then I realized there's no concrete at all and what I'm looking at is just the background under a bridge! 
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Drone 7605910, report to assimilation chamber 4 for readjustment of your optical processors.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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The answer would not be of any help for you, because everything I write here is a lie. William Shatner probably talked many AIs into suicide with this one alone.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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Away.
If it was towards me I would have been run over by now.
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Interesting. It appears to be dependent on which end of the train you are looking at. If I look at the farthest end, it's moving away, but if I look at the closest end, it's moving toward me.
"When you are dead, you won't even know that you are dead. It's a pain only felt by others; same thing when you are stupid."
Ignorant - An individual without knowledge, but is willing to learn.
Stupid - An individual without knowledge and is incapable of learning.
Idiot - An individual without knowledge and allows social media to do the thinking for them.
modified 19-Nov-21 21:01pm.
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Interesting concept. By limiting the animation to two frames, each super-imposeable but with alternate coloration, you can see it either way as, without intermediate images there is no implied directionalality.
It's neat - I'd not thought of that, before.
| Ravings en masse^ |
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| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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I had an app for both my background and lock screen.
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The lock screen in Windows 10 shows awesome pictures by default 
I guess it's the Bing one, but it's different from the one on my desktop.
So that's twice the fun
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Bah, I disable the images. Waste of my precious few cycles.
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I have a considerable dislike for these over-saturated images.
They're appearing all over the place. In stores, I've seen them selling samsung's latest and greatest TV's all blaring absurdly intense colors.
Acceptable to the consumer due to the effect of retinal damage from cell phone staring?
| Ravings en masse^ |
|---|
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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You just haven't seen the right autumn scenery. With the right amount of sunlight, the area I'm in can look very similar to what you see in that picture. Not exaggerating.
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I have taken some richly colored photos, myself. One, of a (no actual sun, though) sunset (with certain props so it just wasn't yet another sunset) has the sky look like impressionist painting (a side effect the focal point being about 20cm away instead of the sky. Some others, now and then.
But nothing like the eyesores that I see posted every which way. The beauty comes from the subtlety. Nature's particularly good at that.
| Ravings en masse^ |
|---|
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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@User-10476399
As it says, mate!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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I think you should post one.
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What, and rain on his parade?
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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If parades weren't meant to be rained on, then they wouldn't have them outside. I say bring on the downpour!
And if he shows up with one, we can just pretend your one didn't happen 
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No time for that. At this time he usually is busy to find that guy who has been posting here under his name yesterday.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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