Sky Creator

Nice but basic function, which will generate good enough results if you know what you are doing. Can't recommend it though, because the application is limited to above horizon skies, you can't create full skybox like you would want to have for spacegames for example.
Hope the developer will add that feature.
Only buy if you need a quick and painless generic skybox, any requirement above generic, the app can not meet. The price clearly saves it. Value for money is good.

I like Sky Creator.
This review is mainly a memo to myself that others might have use for.
My workflow to create an HDRI map from Sky Creator:
1. Go to Settings .
2. Click the and select a folder. Click save as ".EXR" or ".TGA".
3. Click - It will save to the last folder and format chosen in the Settings menu.
4. In Photoshop; import image and the alpha channel data as "alpha-channel", not layer.
5. Create a circle selection around the sun.
6. Sample the color of the sun. Increase intensity of that color to about 14.
7. Fill the circle selection with the current color that you just changed the intensity of.
8. Delete alpha channel and flatten.
9. Save as .EXR for a 3D application.

Cheap and does exactly what the title says

This is really great app to create skyboxes. Enough parameters to make custom maps. I really like this!

The software works as it intended it exports the file to a .tga and .exr format..
I recommend using EXR if you tend to use for DCC software (i.e. Blender, Maya, C4D), tga is not preferable for that. Although do not expect to have something like Unreal Engine level of sky creation, however if the creator can read my review, I hope he/she can improve it in time.
That's said, I would like to see these feature improvements. and the problems need to be fix that I see.
- Being able to export a real multiple exposure stops HDRI image that has the sun data because currently it only export a 32bit 1 stop image, so it is not that really useful when using it on something like Blender Cycles render, I still have to fake the sun by making one. I know this is not an easy task since it's a game engine rather than ray traced.
- Having an incremental slider adjustment (there's no way to do this, so im always quite frustrated about it)
- Being able to go outer space atmosphere and up the cloud view, because this is useful for flying scenes in animation or games.
- Adding 2 layer cloud atmosphere, one is altitude stratosphere higher and the usual lower altitude clouds.

Nice app. Very simple to use and quite useful.

This is a simple way to create HDRI's for your 3d projects. At $5 it's a steal.