Snapblocks is a fork of scratchblocks by @ego-lay_atman-bay, it does exactly what you think. Although it's mostly scratchblocks but with Snap! style, there ARE differences you need to know incase Snap! puts them in forums or you want to try them.
To test out snapblocks for your self, click on this text to visit the website.
CATEGORIES
The categories are mostly the same in snapblocks.
motion::motion
looks::looks
sound::sound
pen::pen
control::control
sensing::sensing
operators::operators
variables::variables
list::list
grey::grey
gray::gray
other::other
custom::#2038FF
custom 2::#F35
OPTIONS
There are 3 options available in snapblocks.
ZEBRA COLORING
Zebra coloring is what you'd expect, when there are 2 or more blocks connected which belongs to the same coloring it will do "zebra coloring" which is where some blocks are brighter that the other ones like a zebra.
To enable, simply turn on zebraColoring option. (Called "Zebra Coloring" in the homepage)
A demonstration of what zebra coloring looks like:
if < < <(x position) \>= ([left V] of [Stage V])> and <(x position) \<= ([right V] of [Stage V])>> or <<(y position) \<= ([top V] of [Stage V])> and <(y position) \>= ([bottom V] of [Stage V])>>> {
...
}
BLOCK WRAPPING
Block wrapping is what happens when a block contains too many blocks on itself and wraps to fit the screen.
To enable this option, enable wrap option. (Called "Block Wrapping" in the homepage) Additionally, you could change the size using the wrapSize option.
A demonstration of what block wrapping looks like:
go to ((postion) + ((list ([sin V] of (direction)) ([cos V] of (direction)) @delInput @addInput) x (steps) @delInput @verticalEllipsis @addInput) @delInput @verticalEllipsis @addInput)
SHOW SPACES
Show spaces is probably not what you expect. If you're familiar with Snap!, you probably already know what this means. In the editor, the spaces are shown as a purple-ish circle to easily know if it's a space, and this option shows exactly that.
The spaces only show in inputs such as a number input, text input, any input.
To enable, simply turn on showSpaces option. (Called "Show Spaces" in the homepage)
A demonstration of what show spaces look like:
ask [Should snapblocks be implemented in Snap! forums?] and wait
And that's everything for the options! Now onto the fun part...
SYNTAX
Just as you thought everything would be the same, you're completely WRONG.
C-BLOCKS
As you might know, to make a c-block you use these: "{}", and for already existing ones you just type the name and it'll be a c-block right? WRONG.
Normally in scratchblocks, if you type if <> then, you'll get [scratchblocks] if <> then [/scratchblocks]
However... if you do that in snapblocks you'll instead get 
To make a c-block, even if it's not a custom c-block, you STILL have to use "{}":
if <>{
}@addInput // good
if <> // bad
ICONS
As you might've already known, we have THESE icons:
Believe it or not, there are MORE icons from Snap! that has already been exported into snapblocks!
@pointRight@gears@gearPartial@gearBig@turtle@turtleOutline@pause@cloud@cloudOutline@storage@flash@brush@circle@circleSolid@paintBucket@eraser@pipette@arrowUp@arrowUpThin@arrowUpDownThin@arrowLeft@arrowLeftThin@arrowLeftRightThin@arrowDown@arrowDownThin@arrowRight@arrowRightThin@arrowLeftOutline@arrowDownOutline@arrowUpOutline@arrowRightOutline@notes@camera@location@globe@globeBig@verticalEllipsis::grey
You can also change the size AND color however you like!
@iconname-s-r-g-b
iconname = The icon name
s = the size
r = Red
g = Green
b = Blue
EXAMPLE:
@notes-2-0-0-0 play notes::sound
DROPDOWNS
Normally in Scratchblocks, you can only get read-only dropdowns in 3.0, one non-readonly dropdown in 2.0 (number input). But in Snapblocks, you can make your OWN dropdowns!
Capital V = READ-ONLY
Lowercase v = EDITABLE
Example:
find [a funny bird v]::motion
if <[a funny bird v] spotted?::motion>{
say [OMG IT'S A BIRD!!!!] in font [Arial V] text size (12 v) for (5) seconds::looks
}@addInput
NOTE: Number input dropdowns on 3.0 will ALWAYS be read-only no matter what.
