Second, stuff you probably know that confuses me.
On Chrome, I can drop (multiple) imgur urls from another Chrome tab, and they are all placed on the canvas.
On Firefox, I get the Upload prompt when I drag the image (an image hosted on imgur in a chrome tab) onto Firefox, but when I drop it, nothing happens.
On IE 10, same as Firefox, but not even the Upload prompt.
Also, what am I missing? I fail to see how to get the image out of snapnote.io. I don't see a download or upload or url...? Nor do I see a link to this desktop app.
While I am in favor of keeping things dead simple, is 6 character URLs too few? Could someone guess confidential work-related screenshots based on that size?
Also is hot-linking/embedding directly to the final image allowed or discouraged?
As for hot-linking; I have no business plan and just wanted to make something useful. I should probably figure that stuff out.
I personally think a freemium kind of model will work best for a service like this. Allow locking only for logged in users, and give each person 30 locks for free monthly (1 per day on average). For additional locks, either charge a small fee out of the user account (something under a dollar), or charge a given amount monthly for flatrate locks. You should allow people to deposit money into their user account in order to pay for these things. They'll most likely consider it playmoney, and that lowers inhibitions when it comes to buying premium features.
One suggestion for workflow purposes - how about allowing clipboard paste for the image? It's easier to screenshot to clipboard and drop directly to annotation
edit - stupid autocorrect, meant to say skitch
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You should check out Bugshot (https://itunes.apple.com/us/app/bugshot/id669858907?mt=8) which I think does a much better job on iOS.
Very cool little tool.