<s>
LeWa	B-Application
OS	I-Application
(	O
Chinese	O
:	O
乐蛙	O
)	O
,	O
also	O
known	O
as	O
Music	O
Frogs	O
and	O
жабка	O
,	O
was	O
an	O
operating	O
system	O
for	O
smartphones	O
,	O
based	O
on	O
the	O
Android	B-Application
mobile	I-Application
platform	I-Application
.	O
</s>
<s>
By	O
the	O
end	O
of	O
April	O
2013	O
,	O
there	O
were	O
more	O
than	O
2	O
million	O
users	O
of	O
the	O
system	O
,	O
and	O
by	O
the	O
end	O
of	O
July	O
2012	O
,	O
they	O
were	O
among	O
the	O
most	O
popular	O
third-party	O
Android-based	O
ROMs	O
in	O
China	O
,	O
together	O
with	O
MIUI	B-Protocol
and	O
DianXin	O
OS	O
(	O
also	O
known	O
as	O
Tapas	O
OS	O
)	O
.	O
</s>
<s>
Lewa	O
was	O
also	O
the	O
first	O
aftermarket	O
Android-based	O
firmware	B-Application
in	O
the	O
world	O
to	O
support	O
the	O
dual-SIM	O
standby	O
feature	O
.	O
</s>
<s>
LeWa	O
's	O
team	O
started	O
developing	O
ROMs	O
for	O
Android	B-Application
devices	O
since	O
August	O
2009	O
,	O
before	O
the	O
LeWa	O
company	O
was	O
established	O
.	O
</s>
<s>
The	O
company	O
released	O
the	O
first	O
official	O
release	O
of	O
LeWa	B-Application
OS	I-Application
in	O
October	O
2011	O
.	O
</s>
<s>
In	O
June	O
2012	O
,	O
the	O
first	O
"	O
Open	O
Build	O
"	O
version	O
was	O
released	O
with	O
parts	O
of	O
its	O
source	O
code	O
open-sourced	O
,	O
accompanied	O
by	O
a	O
toolchain	B-General_Concept
for	O
developers	O
to	O
build	O
their	O
own	O
versions	O
of	O
the	O
OS	O
.	O
</s>
<s>
By	O
Late	O
July	O
2012	O
,	O
the	O
company	O
introduced	O
M+	O
Platform	O
,	O
becoming	O
the	O
first	O
team	O
to	O
develop	O
ROMs	O
optimized	O
for	O
the	O
MediaTeK	B-Architecture
platform	O
.	O
</s>
<s>
The	O
Chinese	O
version	O
of	O
Nokia	B-Application
X	I-Application
had	O
been	O
found	O
to	O
ship	O
with	O
LeWa	B-Application
OS	I-Application
5	O
by	O
default	O
in	O
early	O
2014	O
.	O
</s>
<s>
The	O
ROM	O
includes	O
its	O
own	O
app	B-Application
store	I-Application
named	O
"	O
LeWa	O
Market	O
"	O
,	O
a	O
power-save	O
mode	O
,	O
adjustable	O
switches	O
in	O
notification	O
bar	O
,	O
and	O
other	O
modifications	O
"	O
optimized	O
and	O
localized	O
"	O
for	O
Chinese	O
users	O
.	O
</s>
<s>
Some	O
believe	O
that	O
it	O
provides	O
a	O
user	O
experience	O
and	O
design	O
that	O
's	O
similar	O
or	O
better	O
than	O
iOS	B-Application
and	O
MIUI	B-Protocol
,	O
and	O
some	O
also	O
praise	O
the	O
ROM	O
for	O
being	O
simple	O
and	O
battery-saving	O
.	O
</s>
<s>
However	O
,	O
some	O
Chinese	O
commentators	O
believe	O
that	O
it	O
consumes	O
more	O
battery	O
than	O
stock	O
Android	B-Application
.	O
</s>
