Flowpaper has an interesting concept: the lines you draw become waves in themselves. Unfortunately, that's about it. It might be fine for some time-killing doodling, but I doubt whether you'll return to it weeks or months later to create another "masterpiece".
There are 21 brush types (or rather wave types with different colour palettes) and 12 backgrounds types. The first choices are the "custom" ones, but I could not see what's the difference between the 'single' & 'multiple' custom brush; in fact, all 'multiple' choices appear to be the same, and it always reset to 'single' when I entered settings. Even using the 'single' custom brush, I found it hard to draw plain straight lines without any waves. There are two draw modes: touch & continuous, with the latter making bigger waves or so it appears. You can also adjust the brush length, brush flow (won't produce straight lines though), and brush opacity which, together, offer simple cosmetic variations but aren't really picture-changing tools if you'll excuse the pun. Regarding its core drawing/creation function, I cannot give it more than a rating of 4.
Although it says it has In-App Purchasing, I found no evidence of it inside the app. It could be a leftover from the "free" version in the Play Store which allowed people to upgrade to the "ad-free" version. As far as I could see, this Amazon version should be the full monty and without ads. It also asks for & uses the Internet to connect to some cloud server (Flurry perhaps?), but otherwise runs fine offline. Strangely, it also exhibited a delayed exit on my phone - it was pushed to the background as "cached" but *continuously* used the CPU for a good 5 minutes before finally clearing itself from memory altogether. Thus, half-a-star deducted for those secondary "features".
Again, and as always, I have to take its regular price into consideration when rating. $1.99 is too much for an under-exploited concept (interesting it might be) such as this. Therefore, I'm rounding it down to 3.
My wife is an artist so of course her first doodle using Flowpaper was good enough I posted it on Facebook, but the one I did was pretty good too I thought. You basically have some control over the "brush" in several aspects. The default when first installing it is near parallel lines in different colors. Your finger moves the "brush" so the app is very easy to use on a phone with a touch screen or using any connected drawing tablet. It is far less complicated than the minimum you have to know with some applications but gives the artist with time waiting for a waiter, a meal, or an appoitment something fun to do at minimal purchase cost. I got the full version free in an Amazon promotion from the Amazon app store, but at $1.99 I just bought it from the Google Play Store to put on my wife's android smart cell phone rather than take the time to install the Amazon app store after trying it out on my phone. The best images are ones that you don't let get carried away with too many overlapping lines, but that is my aesthetic opinion.
Heh, I posted this review around 4 AM EST (it is now 10 AM) - and it got kicked back I guess because of the PNG flower art I made (and attempted to attach) as an example of possible creativity with this application. So much trying to highlight the possibilities with this app. I will have it, though, in my YouTube video review.
I spent some time fooling around with the "brushes", which are really only preset colors - you do the actual line draw adjustments with the three control sliders below (tap the tiny "i" towards the top of the dialogue box to get clarification of what each control). Using those sliders to various extremes, I made the stylized rose that ended getting kicked back by Amazon, as well as seeing what could be done with photos (you can either Import or simply tap custom under the background). On the whole, kind of a neat art application that may open up some creative ideas, but in the end... a bit constrained in terms of flexibility.
The Undo function is especially laborious, and without an actual eraser option, you have a choice of the sluggish Undo or simply ... restarting from scratch. I had to deal with the Undo when making the flower portion of my picture, ensuring I did the entire thing without lifting my finger. Otherwise, tapping Undo, "Loading", wait, tap undo, "Loading" wait, tap undo... you get the idea. At least if I didn't care for the result, I only needed to tap Undo once and start the flower over. Same thing with the smaller leaf since I was seeing what refinement the brush sliders could offer.
That's about the gist of the thing. It did save the images directly to my gallery, and the Share option also included my Sketchbook Pro, which is nice. The files are saved as PNG, the high-resolution being 3.41MB in size versus 579KB for the normal resolution, so for web-share that has photo size limits (like YouTube has a 2MB limit on custom thumbnails), high-resolution isn't the best option.
The older reviews from couple years back appear to address a now non-existent issue: there are no "upgrades" or In-App purchasing, everything being included in this Amazon Appstore version - as of right now. I make a point of "as of right now" because the Amazon In-App Billing code is still in there, and thus the Amazon "IAP" tag is also still present on the game. Apparently the devs removed the IAP permission, but not the code, which technically doesn't actually NEED the permission to have IAP implemented through Amazon's Appstore. I do believe, however, this is more of an oversight than nefarious future plans. :p
Also contains Flurry Analytics, yet in this case, it is limited to anonymous aggregate reporting on app performance. It installs at a total of 6MB, and no option to move off device memory, yet even if one could, the savings in Device Memory would be so minor that it wouldn't be all that practical. Since all pictures are saved in the Android Gallery folder, I am assuming the Read/Write is mainly intended to allow this app to find and pull them directly off the defaulted directory if on an External SD card. Back-key does remove the app from the active task listing, yet it still remains running as a back-ground process, not an inconsiderable one either.
If I was given to half stars, this would be a 3.5 rating. The round down to 3 stars is due to the Undo function. Even with a quad-core 1.3GHz, the Undo "Loading" pause each and every time is a bit too much.