<s>
Trello	B-Application
is	O
a	O
web-based	B-Application
,	O
kanban-style	O
,	O
list-making	O
application	O
and	O
is	O
developed	O
by	O
Trello	B-Application
Enterprise	O
,	O
a	O
subsidiary	O
of	O
Atlassian	O
.	O
</s>
<s>
The	O
name	O
Trello	B-Application
is	O
derived	O
from	O
the	O
word	O
"	O
trellis	O
"	O
which	O
had	O
been	O
a	O
code	O
name	O
for	O
the	O
project	O
at	O
its	O
early	O
stages	O
.	O
</s>
<s>
Trello	B-Application
was	O
released	O
at	O
a	O
TechCrunch	O
event	O
by	O
Fog	O
Creek	O
founder	O
Joel	O
Spolsky	O
.	O
</s>
<s>
Lifehacker	O
said	O
"	O
it	O
makes	O
project	B-Protocol
collaboration	I-Protocol
simple	O
and	O
kind	O
of	O
enjoyable	O
"	O
.	O
</s>
<s>
Prior	O
to	O
its	O
acquisition	O
,	O
Trello	B-Application
had	O
sold	O
22%	O
of	O
its	O
shares	O
to	O
investors	O
,	O
with	O
the	O
remaining	O
shares	O
held	O
by	O
founders	O
Michael	O
Pryor	O
and	O
Joel	O
Spolsky	O
.	O
</s>
<s>
In	O
May	O
2016	O
,	O
Trello	B-Application
claimed	O
it	O
had	O
more	O
than	O
1.1million	O
daily	O
active	O
users	O
and	O
14	O
million	O
total	O
signups	O
.	O
</s>
<s>
In	O
2016	O
Trello	B-Application
,	O
allowing	O
3rd	O
party	O
developers	O
to	O
build	O
and	O
distribute	O
extensions	O
known	O
as	O
Power-Ups	O
to	O
Trello	B-Application
.	O
</s>
<s>
Initial	O
integrations	O
included	O
Zendesk	O
,	O
SurveyMonkey	O
and	O
Giphy	B-Algorithm
.	O
</s>
<s>
On	O
January	O
9	O
,	O
2017	O
,	O
Atlassian	O
announced	O
its	O
intent	O
to	O
acquire	O
Trello	B-Application
for	O
$425million	O
.	O
</s>
<s>
In	O
December	O
2018	O
,	O
Trello	B-Application
Enterprise	O
announced	O
its	O
acquisition	O
of	O
Butler	O
,	O
a	O
company	O
that	O
developed	O
a	O
leading	O
power-up	O
for	O
automating	O
tasks	O
within	O
a	O
Trello	B-Application
board	O
.	O
</s>
<s>
Trello	B-Application
announced	O
35	O
million	O
users	O
in	O
March	O
2019	O
and	O
50	O
million	O
users	O
in	O
October	O
2019	O
.	O
</s>
<s>
According	O
to	O
a	O
Glitch	O
blog	O
post	O
in	O
January	O
2012	O
,	O
the	O
client	O
was	O
a	O
thin	O
web	O
layer	O
which	O
downloads	O
the	O
main	O
app	O
,	O
written	O
in	O
CoffeeScript	B-Application
and	O
compiled	O
to	O
minified	B-Language
JavaScript	B-Language
,	O
using	O
Backbone.js	B-Language
,	O
HTML5	B-Application
.pushState( )	O
,	O
and	O
the	O
Mustache	B-Language
templating	B-Language
language	I-Language
.	O
</s>
<s>
The	O
server	O
was	O
built	O
on	O
top	O
of	O
MongoDB	B-Application
,	O
Node.js	B-Language
and	O
a	O
modified	O
version	O
of	O
Socket.io	B-Language
.	O
</s>
<s>
On	O
January	O
26	O
,	O
2017	O
,	O
PC	O
Magazine	O
gave	O
Trello	B-Application
a	O
3.5	O
/	O
5	O
rating	O
,	O
calling	O
it	O
"	O
flexible	O
"	O
and	O
saying	O
that	O
"	O
you	O
can	O
get	O
rather	O
creative	O
"	O
,	O
while	O
noting	O
that	O
"	O
it	O
may	O
require	O
some	O
experimentation	O
to	O
figure	O
out	O
how	O
to	O
best	O
use	O
it	O
for	O
your	O
team	O
and	O
the	O
workload	O
you	O
manage.	O
"	O
</s>
