How many people here use CubeCobra?
1. What does it cost to use?
2. Does it support custom cards?
3. Is it possible to move cards around in the visual spoiler at ease?
4. Is it possible to have a certain amount of columns so it doesn't change depending on your browser and other stuff? (I want 5 columns like CubeTutor)
5. Is it still being updated/upgraded every now and then?
1. It is completely free to use, though they are figuring out how they can reward patrons with non-essential rewards behind the scenes. Basically they're looking in the realm of cosmetics like, e.g., Path of Exile (the game, not the card). If you do want to be a patron, you can be one for as little as $1 per month:
https://www.patreon.com/cubecobra
2. The support is reasonably good. Though you still have to use existing cards as placeholders, you can use a custom image URL and set various other characteristics. I'ld say it's at least on par with CubeTutor, if not better, except that you need to upload your images on an external site. I took a screenshot for you to show how I used
Firedrinker Satyr as the base for a custom card.
3. I don't know exactly what you are asking here. In any case, CubeCobra sorts your cards based on certain characteristics, and you can change the characteristics of your cards. So, if you change the casting cost of a custom card, for example, you can update the casting cost and the custom image URL of your custom placeholder in CubeCobra, after which it will automatically show up in a logical spot.
4. You can not dictate how many columns are shown in the visual spoiler. You can switch between small, medium, and large size images, but the amount of 'columns' then depends on your resolution. On my iPad, for example, medium will result in six columns, while on my work laptop medium results in eight columns. Technically there are no columns though, instead the images are shown in a large row with line breaks.
5. CubeCobra is regularly updated. There is a dev blog (
https://cubecobra.com/dev/blog/0) that shows the last update was 4 weeks ago (as of October the 9th). New releases occur roughly every 2 to 4 weeks, so I'm expecting a new release pretty soon.