<s>
Sketchbook	B-Operating_System
(	O
formerly	O
StudioPaint	B-Operating_System
,	O
Autodesk	B-Operating_System
SketchBook	I-Operating_System
)	O
,	O
is	O
a	O
raster	B-Application
graphics	I-Application
software	I-Application
app	O
intended	O
for	O
expressive	O
drawing	O
and	O
concept	O
sketching	O
also	O
for	O
making	O
animations	O
(	O
Jelly	O
Boo	O
,	O
Teatralka	O
)	O
.	O
</s>
<s>
The	O
software	O
was	O
first	O
developed	O
by	O
Alias	O
Systems	O
Corporation	O
as	O
StudioPaint	B-Operating_System
,	O
before	O
being	O
acquired	O
by	O
Autodesk	O
and	O
then	O
being	O
spun	O
out	O
into	O
an	O
independent	O
company	O
,	O
Sketchbook	B-Operating_System
,	O
Inc	O
.	O
</s>
<s>
Originally	O
developed	O
as	O
commercial	B-Application
software	I-Application
,	O
it	O
evolved	O
into	O
a	O
subscription	B-Architecture
model	I-Architecture
before	O
eventually	O
being	O
made	O
freeware	B-License
for	O
personal	O
use	O
.	O
</s>
<s>
In	O
2021	O
,	O
Sketchbook	B-Operating_System
Pro	I-Operating_System
,	O
the	O
desktop	O
version	O
of	O
the	O
app	O
available	O
on	O
Microsoft	B-Application
Windows	I-Application
and	O
macOS	B-Application
,	O
became	O
a	O
paid	O
software	O
available	O
through	O
the	B-Application
Microsoft	I-Application
Store	I-Application
and	O
Mac	B-Application
App	I-Application
Store	I-Application
.	O
</s>
<s>
Sketchbook	B-Operating_System
features	O
a	O
radial/pie	O
-menu	O
user	O
interface	O
and	O
has	O
painting	O
and	O
drawing	O
tools	O
such	O
as	O
pencils	B-Device
,	O
markers	O
,	O
and	O
brushes	B-Language
.	O
</s>
<s>
It	O
uses	O
pressure-sensitive	O
features	O
of	O
digital	O
drawing	O
pads	O
,	O
tablet	B-Device
computers	I-Device
,	O
and	O
smartphones	B-Application
to	O
create	O
effects	O
similar	O
to	O
traditional	O
materials	O
.	O
</s>
<s>
A	O
screenshot	B-Application
tool	O
is	O
also	O
included	O
for	O
annotations	O
,	O
allowing	O
one	O
to	O
show	O
content	O
during	O
meetings	O
,	O
and	O
to	O
add	O
notes	O
for	O
review	O
.	O
</s>
<s>
The	O
program	O
can	O
also	O
create	O
flipbooks	O
or	O
animations	O
,	O
and	O
it	O
supports	O
layers	B-Algorithm
with	O
the	O
ability	O
to	O
import	O
from	O
and	O
export	O
to	O
Adobe	B-Operating_System
Photoshop	I-Operating_System
(	O
.psd	O
)	O
format	O
.	O
</s>
<s>
Among	O
other	O
features	O
are	O
rulers	O
,	O
brush	O
customization	O
,	O
and	O
canvas	B-Language
rotation	O
.	O
</s>
<s>
When	O
Autodesk	O
acquired	O
Alias	O
in	O
October	O
2005	O
,	O
they	O
slowed	O
down	O
Sketchbook	B-Operating_System
Pro	I-Operating_System
development	O
for	O
a	O
time	O
.	O
</s>
<s>
A	O
beta	O
version	O
of	O
version	O
3.0	O
was	O
shown	O
at	O
MacWorld	O
2008	O
on	O
display	O
with	O
the	O
Axiotron	B-Device
Modbook	I-Device
.	O
</s>
<s>
In	O
April	O
2008	O
,	O
Autodesk	B-Operating_System
SketchBook	I-Operating_System
Pro	I-Operating_System
2009	O
was	O
released	O
to	O
the	O
public	O
,	O
followed	O
by	O
SketchBook	B-Operating_System
Pro	I-Operating_System
2010	O
,	O
a	O
year	O
later	O
.	O
</s>
<s>
Autodesk	O
continued	O
to	O
have	O
a	O
beta	O
program	O
for	O
testing	O
new	O
versions	O
of	O
SketchBook	B-Operating_System
Pro	I-Operating_System
.	O
</s>
<s>
There	O
was	O
a	O
limited	O
consumer	O
version	O
of	O
Sketchbook	B-Operating_System
Pro	I-Operating_System
-	O
SketchBook	B-Operating_System
Express	I-Operating_System
,	O
which	O
provides	O
much	O
of	O
the	O
same	O
functionality	O
as	O
Pro	O
,	O
but	O
does	O
not	O
include	O
brush	O
customization	O
,	O
layer	O
controls	O
,	O
symmetric	O
brushes	B-Language
,	O
or	O
guide	O
lines	O
.	O
</s>
<s>
Earlier	O
versions	O
of	O
Express	O
could	O
not	O
save	O
layers	B-Algorithm
.	O
</s>
<s>
Versions	O
5.5	O
and	O
later	O
,	O
however	O
,	O
do	O
allow	O
the	O
preservation	O
of	O
layers	B-Algorithm
.	O
</s>
<s>
On	O
September	O
17	O
,	O
2009	O
,	O
SketchBook	B-Operating_System
Mobile	O
was	O
released	O
,	O
initially	O
for	O
Apple	O
's	O
iPhone	B-Device
and	O
iPod	B-Device
Touch	I-Device
.	O
</s>
<s>
Android	B-Application
versions	O
of	O
both	O
SketchBook	B-Operating_System
Mobile	O
and	O
Express	O
were	O
to	O
be	O
later	O
released	O
on	O
November	O
30	O
,	O
2010	O
.	O
</s>
<s>
In	O
August	O
2012	O
,	O
SketchBook	B-Operating_System
Pro	I-Operating_System
6	O
was	O
released	O
,	O
marking	O
a	O
return	O
to	O
conventional	O
version	O
numbering	O
.	O
</s>
<s>
Throughout	O
May	O
2014	O
,	O
another	O
new	O
version	O
of	O
Sketchbook	B-Operating_System
Pro	I-Operating_System
was	O
shown	O
on	O
the	O
software	O
application	O
's	O
website	O
,	O
referred	O
to	O
as	O
SketchBook	B-Operating_System
Pro	I-Operating_System
2015	O
.	O
</s>
<s>
In	O
August	O
2014	O
,	O
SketchBook	B-Operating_System
7	O
was	O
released	O
,	O
and	O
with	O
it	O
,	O
it	O
introduced	O
the	O
current	O
subscription	B-Architecture
model	I-Architecture
.	O
</s>
<s>
In	O
May	O
2017	O
,	O
the	O
iOS	B-Operating_System
4.0	O
version	O
of	O
SketchBook	B-Operating_System
was	O
released	O
.	O
</s>
<s>
In	O
April	O
2018	O
,	O
the	O
full-featured	O
version	O
of	O
Sketchbook	B-Operating_System
was	O
made	O
completely	O
free	O
to	O
all	O
users	O
;	O
the	O
subscription	B-Architecture
model	I-Architecture
has	O
been	O
phased	O
out	O
,	O
and	O
all	O
premium	O
features	O
(	O
including	O
perspective	O
guides	O
,	O
flood	O
fill	O
,	O
layer	O
effects	O
,	O
and	O
brush	O
customization	O
)	O
are	O
unlocked	O
.	O
</s>
<s>
Sketchbook	B-Operating_System
will	O
continue	O
to	O
be	O
offered	O
as	O
a	O
commercial	O
subscription	O
product	O
,	O
under	O
its	O
current	O
incarnation	O
:	O
Sketchbook	B-Operating_System
for	O
Enterprise	O
(	O
this	O
version	O
of	O
Sketchbook	B-Operating_System
includes	O
paid	O
technical	O
support	O
as	O
well	O
as	O
cross-functionality	O
with	O
other	O
Autodesk	O
software	O
)	O
.	O
</s>
<s>
In	O
June	O
2021	O
,	O
Autodesk	O
announced	O
SketchBook	B-Operating_System
would	O
spin	O
into	O
an	O
independent	O
company	O
,	O
Sketchbook	B-Operating_System
Inc	I-Operating_System
.	I-Operating_System
led	O
by	O
two	O
former	O
Autodesk	B-Operating_System
SketchBook	I-Operating_System
employees	O
.	O
</s>
<s>
On	O
the	O
30th	O
of	O
that	O
month	O
,	O
Sketchbook	B-Operating_System
released	O
an	O
update	O
which	O
made	O
the	O
app	O
unusable	O
for	O
any	O
device	O
using	O
Android	B-Application
11	O
,	O
causing	O
all	O
saved	O
work	O
to	O
appear	O
deleted	O
and	O
crashes	O
upon	O
opening	O
.	O
</s>
<s>
It	O
was	O
later	O
announced	O
that	O
Sketchbook	B-Operating_System
Inc	I-Operating_System
.	I-Operating_System
would	O
start	O
charging	O
users	O
of	O
Sketchbook	B-Operating_System
Pro	I-Operating_System
in	O
order	O
to	O
fund	O
the	O
development	O
of	O
the	O
application	O
,	O
however	O
,	O
they	O
would	O
not	O
be	O
using	O
the	O
previous	O
subscription	B-Architecture
model	I-Architecture
and	O
instead	O
,	O
charge	O
a	O
one-time	O
payment	O
for	O
the	O
software	O
.	O
</s>
